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Top Forums Shell Programming and Scripting deleting lines in a file that match a pattern without opening it Post 302449135 by agama on Saturday 28th of August 2010 03:58:57 PM
Old 08-28-2010
I assume by 'not opening it' you mean without having to edit it. These commands will delete the lines with the indicated patterns, and then replace the file:

Code:
sed '/foo/d;' <original-file-name >new-file-name
mv new-file-name original-file-name

You need to execute the move command only if you want to replace the original file, and I suggest running the command and looking at the results to ensure you got the sed command right before replacing the file.

Last edited by agama; 08-28-2010 at 04:59 PM.. Reason: original command had two patterns, noticed you needed just one.
 

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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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