Bash Check If Multiline String Contains

The first and second arguments must have compatible string types. In both cases you provide the text of the command-line in your code. You can use this parameter while giving unique names to any temporary files that you create at the time of execution of the shell. Python if elif else: Python if statement is same as it is with other programming languages. In Bash, what is the simplest way to test if an array contains a certain value? Edit: With help from the answers and the comments, after some testing, I came up with this: function contains(). If you want to test your skills using the SQL INSERT statement, try some of our practice exercises. Format method. Backticks appeared much later and thus are more versatile. # sed '3 s/unix/linux/' sed-test. that tells of a new and improved version of the open source screen reader for Linux using the Gnome Desktop Environment. 2) "write to stdout" and "read from stdin until eof" are now supported, making it possible to use this engine to develop CGIs with Apache or other UNIX-based HTTP servers. Therefore, in a Bash script, test does not call the external /usr/bin/test binary, which is part of the sh-utils package. Here's a useful example. 2 days ago · These common String based questions are the ones you need to know to successfully interview with any company, big or small, for any level of programming job. These primaries are put between square brackets to indicate the test of a conditional expression. System Variables. How do I check if variable begins with # in bash shell scripting running on a Linux or Unix-like operating systems? Introduction - In bash, we can check if a string begins with some value using regex comparison operator =~. I'll show you three ways to handle multi-line strings in JavaScript. 2 Advanced Update Support, and Red Hat Enterprise Linux 6. shell script to check whether a character is vowel or consonant. Here are the ones I find interesting. How can I use Windows PowerShell to check a string to see if it contains another string? Use the –Match operator:. grep command in Unix operating system e. The file format, as it is used in Microsoft Excel, has become a pseudo standard throughout the industry, even among non-Microsoft platforms. By using this site, # assuming s is a string, test that it is empty if not s:. Comparing Strings. Three types of wildcards are used with Linux commands. How do I check if a file already has. In this section of our Bash Scripting Tutorial you will learn the ways you may use if statements in your Bash scripts to help automate tasks. Let's say I want to isolate a particular IP address from the output of the. Any attempt to do so splits each line into a separate array element. In bash I'd simply put double-quotes around my $() invocation, but in fish you cannot quote a. Just a little page on how to write simple Unix scripts, not intended to be an elaborate guide. Replace-FileString. Check if folder /data/ is empty or not using bash only features. It is good to test that the given file exits or is not empty. Given a string, Check if characters of the given string can be rearranged to form a palindrome. Bash reads PS1 variable to define the primary prompt and PS2 for a secondary prompt (used when writing multi-line commands). The table below contains an overview of the so-called "primaries" that make up the TEST-COMMAND command or list of commands. If the first line with a match contains multiple matches,. Nonetheless, I'd like to just remind what escaping is good for. Using "type con >myfile. This makes the cache work on Linux again. $(filter-out pattern…,text). Strings and Manipulations or False (not found) it will be necessary to test for ISNUMBER Note the VBA example for Proper contains extra code to not capitalize. XAMPP is a free and open source cross-platform web server package, consisting mainly of the Apache HTTP Server, MySQL database, and interpreters for scripts written in the PHP and Perl programming languages. Python Forums on Bytes. The length of STRING is zero. A jq program is a “filter”: it takes an input, and produces an output. The two methods above are the traditional way to create strings in most programming languages. You are using a color that is lighter than 50% gray for painting. bat "Yellow Submarine" uboot color. but my string may have text also with the date strDate="items needed by 11/21/2011" i have to check if this text contains a date in the format of mm/dd/yyyy RaviRanjanKr 6-Dec-11 9:19am A suggestion :- Always wrap your code in Pre tag. There are two scenarios here to cover. Also, the empty string is always found between any two consecutive characters in a string. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. Linux egrep command help, examples, and additional information. Bash Substring. This results in inconsistent command syntax and overlap of functionality, not to mention. Not so much techno-ranting for now (a bit of an irony, since I do almost nothing but rant in the real world so there will be stuff in here soon!). CHECK TABLE can also check views for problems, such as tables that are referenced in the view definition that no longer exist. I want to check if a string has a `'['` or even better, if has the substring `'- ['` I tried many ways, this was my last one:. The -l is for list, so we get just the filename and not all instances of the match displayed in the results. Following table shows patterns defined in DateTimeForma­tInfo and their values for en-US culture. [SOLVED] basic python question - check if a string contains some text? I am aware that in bash you can go. It is always at least 1, because the first string in argv (argv[0]) is the command used to invoke the program. which directory contains the device files for a Linux system? all the occurrences of the string foo with the string. In the "String" field place the variable that you want…. Fill in your details below or click an icon to log in: Email (required) (Address never made public). grep, fgrep, and egrep do not modify files. If the interpreter is explicitly given as #!/bin/bash or similar, the [[]] can be used without issues (and it is a bit faster than the alternative in Bash, I believe - not that it should be a bottle neck anyway), otherwise one should stick with []. - Linux - Fixed support for comparing GIF images in the Picture Compare. new line and carriage return \r with different characters. multiline (m) extended (x) Regex Tester isn't optimized for mobile devices yet. ) Here's the source code for a complete Java program that demonstrates this case-insensitive pattern matching technique: /** * Demonstrates how to perform a case-insensitive pattern * match using String and the String. Python is an object-oriented high level scripting language. For example property ShortTimePattern is string that contains value h:mm tt for en-US culture and value HH:mm for de-DE culture. Note: The first parameter is the string that contains the data you are checking. Not allowed as a reply item. How to check that string is alphanumeric or not in vb. - Registry Compare - Fixed parsing multi-line strings in. Introduction. To test the script, create a file named 'substring_example. Whenever it comes to text parsing, sed and awk do some unbelievable things. In a BASH "for" loop all, the statements between do and done are performed once for every item in the list. Conversely, if you want Strings to only display strings from initialized, loaded data sections in the file, use the -d command line option. There's no CONTAINS function in Excel. Fill in your details below or click an icon to log in: Email (required) (Address never made public). There are also programs in the section which check if the given string contains a substring and finds the length of the string without using a built-in function. The variables we used in those scripts are called as 'Scalar Variables' as they can hold only a single value. Check if input string exists in file I gather you want to read a string and check if the string is contained in file Bash script, cannote replace string in a. I need to search for strings in someStrings. Backticks appeared much later and thus are more versatile. , "football" string1 would ideally be the same string as matchstring, as the matchstring in the grep command will pipe only files with matchstring in them to sed. Multiple string variable comparisons in an if statement in bash I have two databases of usernames, passwords, and speed packages. This method produces a String that can be used to create a Pattern that would match String s as if it were a literal pattern. Strangely one of the easiest and most portable ways to check for "not contains" in sh is to use the case statement. There are also programs in the section which check if the given string contains a substring and finds the length of the string without using a built-in function. Batch command to check if a string exists in a text file Hi, I am trying to check if a string exists in a text file, and if it does then execute another. Below are a couple of ways this can be done without invoking any other processes. So my question is this if I have a long string which I want to be human readable inside my bash script what is the best way to go about it? Ideally I want: to not have to escape any of the characters. (Again, this warning does not apply if your shell is bash, ksh, or a standard Unix shell. I’ve verified that the url scheme works great by typing in a link like inacho://default into Notes and clicking the link it creates. The -l is for list, so we get just the filename and not all instances of the match displayed in the results. 44 Pmt: The PMT function in Excel calculates the payment for a loan based on constant payments and a constant interest rate. Tests whether a resource contains a given (sub)string. Python string method startswith() checks whether string starts with str, optionally restricting the matching with the given indices start and end. I try the following : if [ "123test" == *test ]; then echo match; fi. There are two scenarios here to cover. In the examples of this article, we'll use this multi-line string: The red fox (who was being followed by a wolf) ran faster than the gray fox. Here I want to pass a string to the script and want the script to check if the string has only [SOLVED] Bash Shell Script to check if a string has only alphabets and digits. In this article, we will discuss the cat command in detail, explaining some of its key. No point in using the Character version for efficiency (tested with repeating up to 100 000 times). You need -F for fixed string (substring) search (used to be with fgrep), but again if $2 contains multiple lines, that tells grep -F to search for any of the content of those lines in the input (grep -F $'a b' would look for a or b, not the $'a b' string). - Misc - Fixed crash when scaled thumbnail is too small to show anything. Strings and text in Java. In this "if" block, the first PS1 is the prompt that will be shown when color is turned on, and the second one (after "else") is used when no color is desired. This document describes how these string representations are mapped to typed properties. It's used in most public APIs on the web, and it's a great way to pass data between programs. All of us are very familiar with strings in programming languages like C. I have a multi-line text field and need to be able to show a view with only items where that field is blank (or functionally blank to a human looking at it). The variables we used in those scripts are called as 'Scalar Variables' as they can hold only a single value. Character Strings Reference. The second is the pattern you want to count. Using Apache Ant Writing a Simple Buildfile. grep provides a lot of features to match strings, patterns or regex in a given text. - Hex Compare - Fixed Find crash when searching for an odd number of hex characters. If the interpreter is explicitly given as #!/bin/bash or similar, the [[]] can be used without issues (and it is a bit faster than the alternative in Bash, I believe - not that it should be a bottle neck anyway), otherwise one should stick with []. CreateProcess will pass the null terminated string containing a command-line to whatever program your new process will invoke. The alias command is built into a number of shells including ash, bash (the default shell on most Linux systems), csh and ksh. Basic UNIX commands Note: not all of these are actually part of UNIX itself, and you may not find them on all UNIX machines. Powershell - How to get Multiline String with Get-Content (txt file) Scripting > The Official Scripting Guys Forum! mysettings. After reading this tutorial, you should have a good understanding of how to test whether a string includes another string. The YoLinux portal covers topics from desktop to servers and from developers to users. Python Forums on Bytes. Not allowed as a reply item. The Bash way of using "for" loops is somewhat different from the way most other programming and scripting languages handle "for" loops. The strings in someStrings. 3) Signals can now be used (the "kill" command, and the "signal" message). Metacharacters or escape sequences in the input sequence will be given no special meaning. The database types are not the same. Condition Description. You can still. The above will match any input of the form 0. (It you want a bookmark, here's a direct link to the regex reference tables). , run) them. An anagram of a string is another string that contains same characters, only the order of characters can be different. 1) XLISP-STAT running in a Mac or Unix X11 or MS-WINDOWS (I have'nt tested other platforms) 2) An xlispstat object descendant of graph-proto showing some points and/or some lines. Since the message enclosed in quotes is typically a string, you can use the vba new line character (vbCrLf) to seperate out various parts of a long message into multiple lines. Percent tilde. Hello, As all you know we can insert multiple lines to one cell while pressing CTRL + Enter combinations. If the first few bytes of a file indicate that the file contains binary The test is that the. This is a linux command line reference for common operations. Check if a String Contains a. Examples to find String Length in Bash. The strtol() function converts the initial part of the string in nptr to a long integer value according to the given base, which must be between 2 and 36 inclusive, or be the special value 0. $1 - contains the value 'linux' $2 - contains the value 'is' and so on. These usually take the form of comparing one variable against another or one variable against a string of text or simply comparing text against text. Parsing Java Logs. How do I read a String from a File line-by-line? the test. For that, the print function is used to take the user entered substring. I've already tried different styles of quoting '*test', "*test", Who can help me? Thanks in advance for your replies! Best regards, Bart. Linux, Solaris, BSD, Ubuntu or IBM AIX is used to search files for matching patterns, by using grep command in Unix you can search a file which contains a particular word or particular pattern. And though I otherwise enjoy the stress reduction of telling my shell to man bash, I actually learned these tricks by reading the Advanced Bash-Scripting Guide, which usually calls this "Parameter Substitution". bashrc To create or overwrite a file from a string it may be simpler to use output redirection. Anchors assert that the engine's current position in the string matches a well-determined location: for instance, the beginning of the string, or the end of a line. bat "Yellow Submarine" uboot color. In this section you'll find some little scripts which will hopefully help you to understand some techniques. The pattern AWK looks for is 'test' and the action it performs when it found a line in the file /tmp/dummy with the string 'test' is 'print'. For Debian based Linux systems, edit /etc/default/rsync, and set the following line: RSYNC_ENABLE=true 3 depends on the folder you are trying to sync, but here is a sample. This results in inconsistent command syntax and overlap of functionality, not to mention. This makes little difference on Posix and Unix hosts, but on DOS-like hosts one should use rcs -i -kb to initialize an RCS file intended to be used for binary files. How do I search multiple strings or words using the grep command? For example I’d like to search word1, word2, word3 and so on within /path/to/file. Before PostgreSQL 8. In computer-science terms, it isn't a "strongly-typed" language. Check string for Carriage Return If this is your first visit, be sure to check out the FAQ by clicking the link above. Wish I could prove I love you, but does that mean I have to walk on water? When we are older you'll understand it's enough when I say so, and maybe some things are that simple. Bash: exact match of a string with regex. ps1 - Find and Replace across multiple files (Bill Stewart). If you are coming to Python from Java, for instance, you might have used the contains method to check if some substring exists in another string. txt file is read. Apart from the common scalar variables, awk is also able to manage variable. : 'ab' in 'abc' -> true 'ab' in 'bcd' -> false How can I do this in a conditional of a bash script?. The Azure CLI uses the --query argument to execute a JMESPath query on the results of commands. The if statement says to only add those items that are not equivalent to the string 'octopus', so the new list only takes in items from the tuple that do not match 'octopus'. Comparing Strings using "if" Testing Strings. argc tells you how many command-line arguments there were. single space a string in javascript; How to check to see if a table exists in a mySQL. One can test that a bash variable starts with a string or character in bash efficiently using any one of the following. Excel provides an easy method to determine if a particular cell contains text. Then test if it contains the empty string. Brief: This example will help you to check if one string contains another substring in a bash script. If cell contains (multiple text criteria) then return (corresponding text criteria) Hello All, I am trying to have a formula that will check whatever is in a cell, if it is one multiple criteria, then I want it to return something else each time it appears. This matches against glob patterns by default so. Strangely one of the easiest and most portable ways to check for "not contains" in sh is to use the case statement. Unlike in many other programming languages, in bash, an array is not a collection of similar elements. How to test if a String contains a case-insensitive regex pattern. The UNIX file system might also be envisioned as an inverted tree or the root system of plant. We can illustrate this easily with a simple script: #!/bin/bash test="Welcome to the Land of Linux" echo "Our variable test is ${#test} characters long". In this lesson we will be creating a simple VBScript If Statement that checks to see if a number stored in the variable myNumber is equal to 7. Include string to use the converter functions, including: string-to-integer (stoi), string-to-long-integer (stol), string-to-float (stof), string-to-double (stod) Once a file is opened, it may be used exactly as std::cin is used. There are also programs in the section which check if the given string contains a substring and finds the length of the string without using a built-in function. If you are writing scripts to run with both Linux and MKS Toolkit, you should use --binary exclusively on both systems. The Perl programming language, originally designed for text-processing only, is the main cause for the popularity that regular expressions enjoy nowadays. Effectively, this will return true for every case except where the string contains no characters. We have been receiving a large volume of requests from your network. To split string in Bash with multiple character delimiter use Parameter Expansions. Here's the general case of how to search for a given key in a hash: # already have a perl hash named %hash, and looking # for a key represented. Conditional expression could be binary or unary expression which involves numeric, string or any commands whose return status is zero when success. All data in Awk are regarded as strings, but if that string also happens to represent a number, numeric operations can be performed on it. Logic will look like. For more documentation on a command, consult a good book, or use the man pages. How to check if string contain. Most of the UNIX utilities operate on ASCII files a line at a time. 6 and earlier allows local users to modify permissions of arbitrary files via a hard link attack on a file while it is being decompressed, whose permissions are changed by cpio after the decompression is complete. Compatible answer. Awk, on the other hand, makes no strong distinction between strings and numbers. shell script to check if string contains vowels. To check if two strings are equal in bash scripting, use bash if statement and double equal to == operator. Functions in Bash (as well as all the other Bourne-family shells) work like commands: that is, they only "return" an exit status, which is an integer from 0 to 255 inclusive. Python strings are "immutable" which means they cannot be changed after they are created (Java strings also use this immutable style). I've already tried different styles of quoting '*test', "*test", Who can help me? Thanks in advance for your replies! Best regards, Bart. Thu, 21 Sep 2017. " $ x="This is my test string. A young boy enters a barber shop and the barber whispers to his Customer, "This is the dumbest kid in the world. look for like 10 different values and return that particular value if contained in a cell- is there an easier way to do that then make a rediculously long if/search statement?. These usually take the form of comparing one variable against another or one variable against a string of text or simply comparing text against text. I'll show you three ways to handle multi-line strings in JavaScript. The program output is also shown below. " $ x="This is my test string. I'll cover the following topics in the code samples below: Windows InstallerOther Languages Batch Command, Goto, Languages Re Batch Command, Batch Command, and Text File. Bash supports a surprising number of string manipulation operations. 7 UNIX if-then-else Exampleswith Sample Shell Scripts!!! - Part I While preparing to write this quick shell scripting tutorial on the UNIX if then else statement, I spent a respectable amount of time reviewing some of the more advanced UNIX shell scripts that I have written during the past 15 years not only to see if there was a pattern to my usage of the "if then else" shell scripting. - Hex Compare - Fixed Find crash when searching for an odd number of hex characters. Use "==" to check if two strings are equal or "!=" to see if they are not. If one of the lines contain the "baby" string, i have to delete this line! Can you help me?. Expressions used with if. Format method. An object of type Integer contains a single field whose type is int. Unix / Linux Shell - The ifeliffi statement - The ifeliffi statement is the one level advance form of control statement that allows Shell to make correct. All data in Awk are regarded as strings, but if that string also happens to represent a number, numeric operations can be performed on it. The YoLinux portal covers topics from desktop to servers and from developers to users. See also Example 39-1. If you want to produce a multiline string (a variable in memory that, upon inspection during execution, contains more than one line of text), you don’t need the trailing backslash but the classic backslash + new line modifier. I have a bash shell function that takes an argument and perform something on it if needed. Invoking Mail To Receive Messages. You are painting an image with the Brush tool. shell script to check if string contains vowels. What is the best way to test if a string is alphanumeric? Preferably using bash shell, I want to test if a string passed to a shell script contains ONLY upper/lowercase letters, and numbers. Unlike in many other programming languages, in bash, an array is not a collection of similar elements. where the aim is to exctract nunber 999. Python Forums on Bytes. String literals inside triple quotes, """ or ''', can span multiple lines of text. (An array of n elements has n-1 separators). Percent tilde. I'm trying to do a simple if statement that tests if a filename exists with a user specified string. contains the. The for loop first creates i variable and assigned a number to i from the list of number from 1 to 5. How can I extract the "test" string and store into a shell variable? A substring is nothing but a string is a string that occurs "in". grep command in Unix operating system e. The quotes turn substitution on and off. (storing values indexed by a string 'abcd', rather than a number index) Special variables There are some "special" variables that ksh itself gives values to. Manipulating Strings. At the prompt, enter:. To continue with your YouTube experience, please fill out the form below. The database types are not the same. The term “regular expressions” is frequently. In both a Linux OS and a Windows OS, I have three files. Other tools are available online if you need hashes specifically with Windows line endings (Carriage Return + Line Feed: \r ). Cell contains one of many with exclusions To test a cell for one of many strings, while excluding others, you can use a formula based on the SEARCH, ISNUMBER, and SUMPRODUCT functions. [SOLVED] basic python question - check if a string contains some text? I am aware that in bash you can go. This property represents a string. Following table shows patterns defined in DateTimeForma­tInfo and their values for en-US culture. I'm using ksh on solaris 2. We can retrieve the length of a given string by using the following: ${#string}. Fill in your details below or click an icon to log in: Email (required) (Address never made public). Give it a try! Go to Practice Exercises. Thanks! Please check your inbox to confirm your subscription. It also allows to save your searches. You are using a color that is lighter than 50% gray for painting. Also, on all hosts, rcsmerge (1) normally refuses to merge files when -kb is in effect. Insert - Insert(IntStartIndex, String_value). For example: randstring=caboosel1 I want to know if this string contains any of the following: 1 (one), l (lower case L), 0 (zero) or O (upper case O). I need to check if a file contains a specific line. contains() method returns true if and only if this string contains the specified sequence of char values. Checking if a string contains a substring is one of the most basic and frequently used operations in Bash scripting. The file contains text and multiple lines. I have a bash shell function that takes an argument and perform something on it if needed. Stack traces often look like this. The Groovy Development Kit contains methods for stripping out the indentation with the String#stripIndent() method, and with the String#stripMargin() method that takes a delimiter character to identify the text to remove from the beginning of a string. Red Hat Enterprise Linux 3 CentOS Linux 3 Red Hat Enterprise Linux 4 CentOS Linux 4 Oracle Linux 4 Race condition in cpio 2. log"`; then echo "The string is present in the file!". Unix/Linux Shell programming. severalnines. In this article of the Perl Tutorial we are going to learn about hashes, one of the powerful parts of Perl. This will be for a text file that operates like a phone book containing names, addre. Short answer: see BashFAQ #50 ("I'm trying to put a command in a variable, but the complex cases always fail!"). How to Replace Line Breaks , New Lines From String in Java. 5 to Java 1. This is risky business indeed. " This means if a line contains the string "30", the system prints out the element at the 3rd column of that line. These usually take the form of comparing one variable against another or one variable against a string of text or simply comparing text against text. Thus, for example, for a file named file3 which contains the string abcd followed by a single space and then by the string efghi on the first line and the string jklm on the second line, the following command would return the number 0 before the strings in the first line and the number 11 before the string in the second line: strings -t d file3. Python strings are "immutable" which means they cannot be changed after they are created (Java strings also use this immutable style). org/mailman/listinfo/python-list. Invoking Mail To Receive Messages. An object of type Integer contains a single field whose type is int. Firefox, Edge, and others. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. 2) "write to stdout" and "read from stdin until eof" are now supported, making it possible to use this engine to develop CGIs with Apache or other UNIX-based HTTP servers. If file does not already exist, MATLAB asks if you want to create it. System Variables. Early versions of the free/open Unix variant BSD came with password files that included hashed passwords for such Unix luminaries as Dennis Ritchie, Stephen R. Anchors belong to the family of regex tokens that don't match any characters, but that assert something about the string or the matching process. The YoLinux portal covers topics from desktop to servers and from developers to users. Suppose you had a long message that you wanted to show in multiple lines. Get substring of String: Like other programming language, bash has no built-in function to cut value from any string data. You can use this parameter while giving unique names to any temporary files that you create at the time of execution of the shell. I have a multiline texbox, and would like delete lines if it's contain some string. check if a string contains some text?. Clear the check box to opt out. Below are a couple of ways this can be done without invoking any other processes. Python String contains. An example if substring does not exist. Attribute !* Value. Tests whether a resource contains a given (sub)string. I want to enter a formula that extract the corresponding $ amount only if the text string contains either of several specified "key words". quote_ident('Foo bar') "Foo bar". Recommended: Please. BASH - If statement and comparison operators by sanaswati on 03/07/2012 in bash shell scripting You can use if statements without any brackets or within [] or [[]] or (). For example: randstring=caboosel1 I want to know if this string contains any of the following: 1 (one), l (lower case L), 0 (zero) or O (upper case O). I would like to ask if how to check if the multi-line text field is empty? Because when i tried to create a condition when multiline is empty, still satisfy both? even if i dont put any value in my field it still treat as it has a value. The name "grep" stands for "global regular expression print". Your If Statement would check to see if the day was a Monday and if it was (true) then it would execute the code to print out that annoying line of text. Here's a useful example. A customer had some information they needed to obtain from the description property on an object. txt sometimes end with a number. If you're looking for the exact match on the whole string as in your example, you can use [code bash]==[/code]: [code bash] # matches "count" only if [[ ";$tmp". Below is the implementation of above idea : // palindrome or not. Be sure that when you use the str. Match string not containing string Check if a string only contains numbers Match elements of a url Validate an ip address Match an email address Match or Validate phone number Match dates (M/D/YY, M/D/YYY, MM/DD/YY, MM/DD/YYYY) Empty String Match html tag Checks the length of number and not starts with 0 Not Allowing Special Characters Match a. bash check if string ends with character. 44 Pmt: The PMT function in Excel calculates the payment for a loan based on constant payments and a constant interest rate. Contains(String, StringComparison) Returns a value indicating whether a specified string occurs within this string, using the specified comparison rules. This is true e. I'll show you three ways to handle multi-line strings in JavaScript. Do not wrap the string in single quotes or double quotes. How do I read a String from a File line-by-line? the test. Conversely, if you want Strings to only display strings from initialized, loaded data sections in the file, use the -d command line option. Often, you want to match complete lines in a text file rather than just the part of the line that satisfies a certain requirement. The following table gives a summary of some common String-related operations, and at least one way of performing each one in Java. What is the simplest way to check if a string contains newline? For example, after FILE=$(find. A response "No mail for user_name" means there are no new or old saved mail messages. I need an if statement for a Linux bash shell script, to determine if a string contains one or more of a given set of characters. May be i (2 Replies).