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Top Forums UNIX for Dummies Questions & Answers awk -remove pattern from file Post 302964741 by Scrutinizer on Monday 18th of January 2016 03:33:53 PM
Old 01-18-2016
Try:
Code:
awk '$4~/^[0-9][0-9][0-9][0-9]$/{sub($4 FS,x)}1' file

or, if your awk supports this (gawk 3.x needs --re-interval):
Code:
awk '$4~/^[0-9]{4}$/{sub($4 FS,x)}1' file

or just:
Code:
awk '{sub(/^[0-9]{4} $/,x,$4)}1' file


--
Quote:
Originally Posted by RavinderSingh13
[..]
Code:
awk '{if($4 ~ /[0-9][0-9][0-9][0-9]/){$4="\b"}} 1'  Input_file

[..]
Try redirecting that to a file. You will notice that the backspace characters are still there, so I do not see how this can be a valid solution, other than that it looks OK on the terminal/screen...

Last edited by Scrutinizer; 01-18-2016 at 05:07 PM..
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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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