After reading this tutorial, you should have a good understanding of how to test whether a string includes another string. Each Linux command returns a status when it terminates normally or abnormally You can use command exit status in the shell script to display […] Read more → Bash Shell: Test If File Exists. Make it do more tests! For example, to check that a file named "file1.txt" exists or a file called "file1.doc" exists, you can use the … Sometimes, we need to check if the pattern presents in a file and take some actions depending on the result. Now in another script i need to check if both of the above mentioned files are present in a directory or not. Also the test command has a logical “not” operator which allows to get the TRUE answer when it needs to test if file does not exist. You can … Check easily whether a string exists in a file! Anyone could please tell me how... (3 Replies) -a file: Returns true if file exists. Thus, instead of testing whether the string only contains spaces, test whether the string contains some character other than space. Check if Two Strings are Equal # In most cases, when comparing strings you would want to check whether the strings are equal or not. The easy way to check that a string only contains characters in an authorized set is to test for the presence of unauthorized characters. Compare Strings in Bash. Block-special files are similar to regular files, but are stored on block devices — special areas on the storage device that are written or read one block at a time.-c file In bash, ksh or zsh: In this article i will share examples to compare strings in bash and to check if string contains only numbers or alphabets and numbers etc in shell script in Linux. Cool Tip: Create a clever bash script! The TEST-COMMAND often involves numerical or string comparison tests, but it can also be any command that returns a status of zero when it succeeds and some other status when it fails. Another test compares two statements and if either is true, output a string. Does the same thing as -e.Both are included for compatibility reasons with legacy versions of Unix.-b file: Returns true if file is "block-special". Checking if a string contains a substring is one of the most basic and frequently used operations in Bash scripting. bash if -f : Check if file exists and is a regular file if statement when used with option f , returns true if the length of the string is zero. It can be done with the help of ‘exit status codes’. Following example proves the same. Unary expressions are often used to examine the status of a file. Bash does not segregate variables by “type”, variables are treated as integer or string depending on the context. – kos Mar 27 '16 at 9:52 Yes that what I want – BigAlligator Mar 27 '16 at 10:04 add a comment | I gather you want to read a string and check if the string is contained in file.txt? Bash includes powerful programming capabilities, including extensive functions for testing file types and attributes, as well as the arithmetic and string comparisons available in most programming languages. I know to check one file but need to check both the files. In my last article I shared some examples to get script execution time from within the script.I will continue with articles on shell scripts. The Bash shell is available on many Linux® and UNIX® systems today, and is a common default shell on Linux. Hi all, One of my script crated created 2 files in a dirs Output.log and Output.tmp. 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