$ grep -i -r 'income tax' ~/accounting/ How do I find all files containing specific text on Linux? Our final example ignore case distinctions in both the search PATTERN and the input files: Pass the -color option to the grep command display matched text/words in color on the terminal:įig.01: grep command in action with colors and hiding the warnings on screen Task: Ignore case $ grep -w -R 'getMyData()' ~/projects/ 2>/dev/null Task: Display matched text in color This will send and hide unwanted output to /dev/null device: To hide all errors or warning message spam generated by the grep command, append 2>/dev/null to grep command. Grep command generate error message as follows due to permission and other issues: $ egrep -w -R 'word1|word2' ~/projects/ Task: Hide warning spam $ grep -w -R 'getMyData()' ~/projects/ Task: Search for two or more words In this example, search for word ‘getMyData()’ only in ~/projects/ dirctory: You can select only those lines containing matches that form whole words using the -w option. $ grep -h -R 'main()' ~/projects/*.c Task: Display only words You can pass the -h option to suppress inclusion of the file names in the output: The grep command shows output on a separate line, and it is preceded by the name of the file in which it was found in the case of multiple files.
To just display the filename use the cut command as follows: Sample outputs: filename.txt: redeem reward You can pass -H option to print the filename for each match: $ sudo grep -R "barfoo" /etc/ Task: Only display filenamesīy default, the grep command prints the matching lines. Hence, it is better to restrict the search to particular directory as per your needs: The above command may take a lot of time. In other words, use the following command to search for a word called “barfoo”: I want to search the whole Linux server for a string. Trying to find all files containing specific text on my Linux desktop Look for all files containing cacheRoot text on Linux: You can search for a text string all files under each directory, recursively with -r option: $ grep "redeem reward" ~/*.txt Task: Search all subdirectories recursively to find text in files Let us find text called “redeem reward” in files under Linux: In this example, search for a string called ‘redeem reward’ in all text (*.txt) files located in /home/tom/ directory, use:
#Find word in file unix command how to#
How to search and find all files for a given text string Let us see some common example on how to use grep to search for strings in files. Grep -r -H " text string to search" directory-pathĮgrep -R " word-1|word-2" /path/to/directoryĮgrep -w -R " word-1|word-2" directory-path Grep -r " text string to search" /directory-path Grep " text string to search" directory-path The Linux syntax to find string in files is as follows: This will look for literal strings only, it won't use or expand any kind of regular expression.įor example you could type: fgrep 'a$*b?' file.txtĪnd fgrep would look for the string “a$*b?” in the file “file.txt”.Grep command syntax for finding a file containing a particular text string This version of grep calls grep with the -F option. You could also use grep with the -r option to achieve the same affect. Follows similar syntax to grep (see above). This will search all the files in the current directory and all it's subdirectories and print the names of the files and the matching line.
rgrepĪ "recursive" version of grep (this is a different program to grep). The first command lists all RPM's installed on your system, the second finds any containing the string “ogg” and outputs them. Or you could use it like this, to search through the output of another file: rpm -qa | grep ogg This command uses regular expressions, for more information please see, the Section called Regular Expressions in Chapter 20.įor example, this command would look in the file “rpmlist.txt” for anything starting with “rpm”: grep rpm rpmlist.txt r or rgrep - search for text within files recursively. A x or -B x (where x is a number) - display “x” lines After or Before the section where the particular word is found. w - this option makes grep match the whole word n - this option displays the line numbers v - this option is used to display lines which do not contain the string. For example: grep this_word this_file.txt
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