On Friday, November 09, 2012 11:28:29 PM T o n g wrote:
> Any way to filter through external command to variable, somewhat like:
>
> head /etc/group | awk '{print $0 | "cut -d':' -f1" | getline result ;}'
>
> Any way to make it works?
You'd *think* there'd be a way to do that, but I don't think awk works that
way. I don't see a way to pipe both ends of an external command. I'm not sure
even *perl* could do that.
Your best bet is to follow the ancient UNIX mantra of writing a program or
script to do one thing well. Split the awk script into two parts, as in:
awk -f part1 < file | external_filter | awk -f part2
Of course, if it's a simple filter like the one you illustrated, you can do it
in awk:
awk '{split($0, result, ":"); print result[1];}' </etc/group
or
awk '{sub(/:.*/, "", $0); print;}' < /etc/group
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