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Shell Programming and Scripting

Grep command

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Top Forums Shell Programming and Scripting Grep command
# 8  
Old 03-21-2017
Some Perl suggestions:
Code:
perl -nle '
    if($.==2){$timestep=$_; next}
    print "$timestep $_" if /^4 /;
    $.=1 unless $ARGV eq $p; $p=$ARGV
' dump[1-9]{????,?????,??????}.data > particle4

or
Code:
export search='4'
perl -nle '
    if($.==2){$timestep=$_; next}
    print "$timestep $_" if /^$ENV{search} /;
    $.=1 unless $ARGV eq $p; $p=$ARGV
' dump[1-9]{????,?????,??????}.data > particle"$search"

Last edited by Aia; 03-21-2017 at 11:58 PM..
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LEARN ABOUT OSX

svk::log::filter::grep

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)