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Top Forums Shell Programming and Scripting Grep and neglect a specific string Post 303015670 by RudiC on Tuesday 10th of April 2018 04:13:44 AM
Old 04-10-2018
It is usually best and most efficient for all parties to carefully phrase the request in the first place, cogitating all the possible ramifications e.g. difference in structures and positions in files. Better than letting drip in information droplet by droplet after a solution was found for the first but non-fitting sample.

The easiest way would be to force the long lines into several independent ones:
Code:
tr ' ' '\n' < file | sed ...

The logics lie in the regex: find a string of zero or more colons (parenthesized for later "back reference") then any number of non-colons, the "hope" string, non-colons again, and finally zero or more colons. Replace by the first colon if exists else the empty string (i.e. remove)
 

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GREP(1) 						      General Commands Manual							   GREP(1)

NAME
grep - search a file for lines containing a given pattern SYNOPSIS
grep [-elnsv] pattern [file] ... OPTIONS
-e -e pattern is the same as pattern -c Print a count of lines matched -i Ignore case -l Print file names, no lines -n Print line numbers -s Status only, no printed output -v Select lines that do not match EXAMPLES
grep mouse file # Find lines in file containing mouse grep [0-9] file # Print lines containing a digit DESCRIPTION
Grep searches one or more files (by default, stdin) and selects out all the lines that match the pattern. All the regular expressions accepted by ed and mined are allowed. In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or 1 occurrences, and | can be used between two regular expressions to mean either one of them. Parentheses can be used for grouping. If a match is found, exit status 0 is returned. If no match is found, exit status 1 is returned. If an error is detected, exit status 2 is returned. SEE ALSO
cgrep(1), fgrep(1), sed(1), awk(9). GREP(1)
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