| Using variable in awk [message #97629] |
Tue, 24 September 2002 20:10  |
Khush
Messages: 1
Registered: September 2002
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Junior Member |
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Hi,
we use $N for the Nth parameter of the input data
string in an awk command.
How do we use a variable in the awk command? The
following is my need:
I have a file s.c like this: (delimited by 'x')
123x452x460
asdfx234xliasd
23x009xasdf
I do the following command:
cat s.c | awk -Fx '$2~/23/{print $0}'
then I get the appropriate line. (The second line
is printed)
Now, I replace the 23 with $var1. Where I have put
var1=23 before this command. But it does not work.
So I have a feeling that, there is some trick while
putting the variable into the awk command. (Because
$ has a special meaning in awk).
So how to make it parametric?
Thanks
Khushnuma
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| Re: Using variable in awk [message #97636 is a reply to message #97629] |
Mon, 30 September 2002 04:34  |
Shaun
Messages: 5
Registered: July 2002
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Junior Member |
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To get an environment variable into your awk scripts
use the ENVIRON function something like this:
cat file | awk '
BEGIN { var1 = ENVIRON[["VAR1"]] }
$2 ~ var1
{... rest of awk script ...
}'
or if you want to hard code it then:
BEGIN { var1 = "23" }
Regards,
Shaun.
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