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Full Discussion: Issue with grep
Top Forums Shell Programming and Scripting Issue with grep Post 302622709 by Corona688 on Thursday 12th of April 2012 01:11:59 PM
Old 04-12-2012
grep isn't a programming language, its options for what parts of the match get printed are limited.

How about awk? It is a programming language and understands tokens. Here the program is just 'for all lines that match the regex /client-hostname/, print column two'.

Code:
xterm -hold -e sh -c "tail -f /var/lib/dhcp3/dhcpd.leases | awk '/client-hostname/ { print $2 }'" &>/dev/null &

 

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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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