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Replace pattern from nth field from a file

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Top Forums Shell Programming and Scripting Replace pattern from nth field from a file
# 8  
Old 07-26-2015
For this particular case, this might work as well.
Code:
perl -pe '
    BEGIN{ %m = map{++$i => $_} qw(Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec)};
    s/(\d+).(\d+)_(\d+).(\d+)/$m{int($1)} $2 $3:$4/;
' File_Name

If other fields could contain date material that might interfere, then:
Code:
perl -plaF, -e '
	BEGIN{ %m = map{++$i => $_} qw(Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec)};
	$orig = $F[3];
	$F[3] =~ s/(\d+).(\d+)_(\d+).(\d+)/$m{int($1)} $2 $3:$4/;
	s/$orig/$F[3]/;
' File_Name
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chsh

CHSH(1) 							   User Commands							   CHSH(1)

NAME

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SYNOPSIS

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DESCRIPTION

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SEE ALSO

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AUTHOR

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