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Top Forums Shell Programming and Scripting Adding delimiter to logged in users Post 302232221 by era on Thursday 4th of September 2008 06:18:32 AM
Old 09-04-2008
It's basically equivalent to awk -v user="$f" -F : '$1 == user { print $5 }' if you prefer that. It prints the fifth field when there is a match on the first. (The sed script additionally prunes anything after the first comma; you can do that with sub in awk.)

Actually this could be a place to finally actually implement the putting of pipes between the values!

Code:
awk -v regex=^`echo -n "$users"*| tr ' ' '|'`$ -F : '
  $1 ~ regex { p=$5; sub (/,.*/, "", p); print p " has logged in more than once" }' /etc/passwd

If your awk doesn't understand -v, see if you have nawk or gawk or mawk

Last edited by era; 09-04-2008 at 07:25 AM.. Reason: Finally implement pipes between values
 

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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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