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Top Forums UNIX for Beginners Questions & Answers Grep multiple patterns(file) and replace whole line Post 303036264 by MadeInGermany on Friday 21st of June 2019 04:23:16 AM
Old 06-21-2019
Looks too complicated.
Why 3 input files?
How does you pattern_grp file look like?
Say it looks like
Code:
H_A hot.*aaa.*
C_B cold.*bbb.*
C_A cold.*aaa.*

The value pairs seem related.?
Then you can read both whitespace-separated columns into two variables:
Code:
while read sp pat; do printf "%s alias %s match %s times\n" "$sp" "$pat" "$(grep -c "$pat" input_file)"; done < pattern_grp

But why do you do all the printing with aliaes when at the end you throw the output away, in favor of the amount of the non-matches?
--
BTW each expression in command arguments should be in "quotes", because the shell should not attempt substitutions on it.
So there should be quotes around the $pat argument of the grep command, and another pair around the $( ) argument of the printf command.
The $( ) runs a subshell, so the quotes inside and outside do not conflict. I forgot the outer quotes in my previous post.

Last edited by MadeInGermany; 06-21-2019 at 05:31 AM..
 

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SVK::Log::Filter::Grep(3)				User Contributed Perl Documentation				 SVK::Log::Filter::Grep(3)

SYNOPSIS
SVK::Log::Filter::Grep - search log messages for a given pattern DESCRIPTION
The Grep filter requires a single Perl pattern (regular expression) as its argument. The pattern is then applied to the svn:log property of each revision it receives. If the pattern matches, the revision is allowed to continue down the pipeline. If the pattern fails to match, the pipeline immediately skips to the next revision. The pattern is applied with the /i modifier (case insensitivity). If you want case-sensitivity or other modifications to the behavior of your pattern, you must use the "(?imsx-imsx)" extended pattern (see "perldoc perlre" for details). For example, to search for log messages that match exactly the characters "foo" you might use svk log --filter "grep (?-i)foo" However, to search for "foo" without regards for case, one might try svk log --filter "grep foo" The result of any capturing parentheses inside the pattern are not available. If demand dictates, the Grep filter could be modified to place the captured value somewhere in the stash for other filters to access. If the pattern contains a pipe character ('|'), it must be escaped by preceding it with a '' character. Otherwise, the portion of the pattern after the pipe character is interpreted as the name of a log filter. STASH
/PROPERTY MODIFICATIONS Grep leaves all properties and the stash intact. perl v5.10.0 2008-08-04 SVK::Log::Filter::Grep(3)
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