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Evaluating environment variables in awk

Posted on 2004-09-30
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Last Modified: 2013-12-26
Hi,

Just a hopefully easy question:

I've got an awk command on a single line namely:

awk -F: '/^[^#]/ {if ($2 == "XXX") printf "%s\n", $1}' /tmp/file.txt

Everything works perfectly, however I need to replace the "XXX" with an environment variable.  Unfortunately, I can't get this to work.  Please help!

Thanks,

Neil
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Question by:neil_mw
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5 Comments
 
LVL 11

Expert Comment

by:griessh
ID: 12190712
Hi neil_mw, did you try

export VAR=XXX

... ($2==$VAR) ...

======
Werner
0
 

Author Comment

by:neil_mw
ID: 12191028
Yes I did, I'm afraid
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LVL 12

Accepted Solution

by:
geotiger earned 50 total points
ID: 12191221
Have you tried to pass the OS variable to awk variable using nawk instead awk?

nawk -F: '/^[^#]/ {if ($2 == v1) printf "%s\n", $1}' v1=$XXX /tmp/file.txt


0
 

Author Comment

by:neil_mw
ID: 12191263
Unfortunately we don't have nawk installed and, as this is a customer machine, we'd have a fight before being able to install it!
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LVL 21

Assisted Solution

by:tfewster
tfewster earned 50 total points
ID: 12191892
Which Unix? geotigers comment works in "standard" awk (as supplied on Solaris) as well as in nawk
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