securitybreach Posted October 26, 2014 Share Posted October 26, 2014 The grep command tutorial on a Unix/Linux for new Linux and Unix users/sysadmins/devops: grep intro http://www.cyberciti...-in-linux-unix/ grep regex http://www.cyberciti...rep-regular-expressions/ and more. #unix #linux #osx #grepcommand #bsd https://plus.google....sts/hNJXu2Yzi2p HowTo: Use grep Command In Linux / UNIX – Examples How do I use grep command on Linux, Apple OS X, and Unix-like operating systems? Can you give me a simple examples of the grep command? The grep command is used to search text or searches the given file for lines containing a match to the given strings or words. By default, grep displays the matching lines. Use grep to search for lines of text that match one or many regular expressions, and outputs only the matching lines. grep is considered as one of the most useful commands on Unix and other Linux operating systems. Did you know? The name, "grep", derives from the command used to perform a similar operation, using the Unix/Linux text editor ed: g/re/p The grep command syntax The syntax is as follows: grep 'word' filename grep 'word' file1 file2 file3 grep 'string1 string2' filename cat other file | grep[/b] 'something' command | grep' something' command option | grep 'data' grep --color 'data' filename How do I use grep command to search a file? Search /etc/passwd file for boo user, enter: $ grep boo /etc/passwd Sample outputs: foo:x:1000:1000:foo,,,:/home/foo:/bin/ksh You can force grep to ignore word case i.e match boo, Boo, BOO and all other combination with the -i option: ]$ grep -i "boo" /etc/passwd http://www.cyberciti...-in-linux-unix/ 1 Quote Link to comment Share on other sites More sharing options...
abarbarian Posted October 26, 2014 Share Posted October 26, 2014 Nicely done. I do like plain language guides. Quote Link to comment Share on other sites More sharing options...
burninbush Posted October 27, 2014 Share Posted October 27, 2014 I love grep, one of my favorite tools, use it every day. However, I think the writer might be wrong about where the name comes from, I was told it was General Regular Expression Parser. Whatever. I first used it on IBM desktops back in the late 1980's, came in a package called Korn Shell Tools. Also had fgrep and egrep, and all the common command line utils. Nothing better for searching log files. Grep also has a very useful -f switch, where you can give it the name of a text file which is a list of search strings, as many as you want. I used it extensively on a Sun Spark box in the runup to Y2K to find problem code in our company product. 1 Quote Link to comment Share on other sites More sharing options...
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