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 :: Mailing Lists

[ILUG] Awk + env vars q

[ILUG] Awk + env vars q

Philip Reynolds phil at redbrick.dcu.ie
Wed Apr 25 20:02:28 IST 2001


Stephen Shirley's [diamond at skynet.ie] 20 lines of wisdom included:
:>Mornin',
:>	Right. I know this isn't possible. But neither is bumble-bee
:>flight [0]. So here goes anyway. If I do this:
:>
:>echo bla | awk '{system("export FOO="$0); print "Value was
:>"ENVIRON["FOO"]}'
:>
:>It doesn't work. Now this is only an example, the real thing is much more
:>involved. So the question is - how do I get the output of something I ran
:>using the system function in awk?

Awk isn't designed to do this kind of thing and you can't do it
directly from awk. However, it is possible using some shell + awk.


echo bla | awk 'BEGIN { printf("FOO='%s'\n", $0) }' > /tmp/awk.$$
. /tmp/awk.$$       
rm /tmp/awk.$$

Or some shells allow the eval statement, so that:
echo bla | eval `awk 'BEGIN { printf("NEWVAR=%s\n",$0) }'`

should work.
Regards,
Phil.




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