grep is a command-line tool for searching text patterns in files

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Reverse match in sed, replace opposite of what was found

Say I have this output from my syslog, precalculated src_hash => 20 bytes @ 0x7f811c001e20 A6 2D E5 CD 2A BA F0 42 56 66 19 D4 61 1A E3 A0 .-..*..BVf..a... C7 5E 5F 77 ...
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For all files that does not contain a string, prepend a string to the file

I am trying to iterate through a list of html files, check to see if {% load static from staticfiles %} exists in the file and if it does not exists, prepend {% load static from staticfiles %} to it. ...
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1answer
59 views

How to execute grep in tcl for getting XYZ-123 type pattern

can I execute this grep command in TCL? grep '[A-Z][A-Z][A-Z]\-[0-9][0-9][0-9]' file1 > file2
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Limiting grep search

Please help! Must use grep for this assignment. Must control grep function to search for a string strictly in a given field (Sadly no delimiters) Search field is characters 12-26. Must check if user ...
0
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1answer
48 views

Need to grep for specific lines from ongoing log and save it in some file

So, let me start with the overall outcome that i want to achieve. There is just one log, which will have info on certain devices, that i am upgrading. I use "tailf log" to monitor the log. Now, ...
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0answers
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agrep with directionally biased penalties

I am using tre-agrep, an implementation of agrep, to perform approximate pattern matching. This utility searches for matches based on Levenshtein distance, and the user can configure the penalty ...
2
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266 views

exit code of grep in trap where the script is launched by upstart service

recently I encountered a problem in ubuntu upstart and trap in bash shell. I use ubuntu 12.04 the upstart script(/etc/init/player.conf) is: start on (local-filesystems and runlevel [2345]) stop on ...
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How to put the output of the trailing lines of grep in on-line?

Assuming that I have this file: Thu May 8 15:32:07 2014 User-Name = "Mark" Framed-IP-Address = 0.0.0.0 Acct-Status-Type = Interim-Update Acct-Input-Octets = 95684 ...
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Using three grep commands to sort and alphabetically order

I created the file ~/firstredhat.txt. How do I make an alphabetically sorted list of all files underneath the /usr/share/firstboot directory (and its subdirectories) that contain the text redhat, ...