grep -E with parameter doesn't work

Question

If I use -E option for grep from a script I'm unable to user variables. For example:

txt file:

word
nir asd b asd
text

script:

#!/bin/bash

PARAM=b
cat txt | grep -E 'nir.*${PARAM}'

The script return nothing. I guess with -E option I need to escape the variable somehow.

It's just a small example for you to understand the real problem, e.g the grep. The " solved it, thanks — Nir
– Nir, Commented Jan 31, 2016 at 9:54

Hauke Laging · Accepted Answer · 2016-01-31 09:56:04Z

0

PARAM=b
grep -E "nir.*${PARAM}" txt

or

grep -E 'nir.*'"${PARAM}" txt

answered Jan 31, 2016 at 9:49

Hauke Laging

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