Accessing Shell Variables in awk or sed

nasersh · #1 (**permalink**) 05-05-2008

Hello,

I wonder if it is possible to pass and use variables from shell environment into sed or awk. I am trying to achieve something similar to the following using sed or awk:

Code:

var=some_regular_expression
grep "$var" filename # Will extract lines from filename

The following code, obviously, doesn't work as I expect it to:

Code:

var=some_value
awk '/$var/ {print}' filename # or: sed -n '/$var/p' filename; This doesn't work same as grep

Is there any other way I could access sh-scoped variables inside an awk program?

danmero · #2 (**permalink**) 05-05-2008

Quote:

Originally Posted by nasersh

Hello,

I wonder if it is possible to pass and use variables from shell environment into sed or awk. I am trying to achieve something similar to the following using sed or awk:

A basic example:

Code:

var=value
awk -v X=$var 'BEGIN{print X}'

nasersh · #3 (**permalink**) 05-05-2008

Thanks, how about with sed?

Franklin52 · #4 (**permalink**) 05-05-2008

With sed:

Code:

sed '/'"$var"'/p' filename

Regards

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