On Sun, Sep 16, 2012 at 3:44 AM, Morning Star
<morning.star.c...@gmail.com> wrote:
> Hi guys,
> I get a difficulty to produce the desired output using awk. i want to
> use for loop bash variable as the input to the awk variable
> here is the illustrated input:
>
> line_1
> line_2
> line_3
> line_4
> line_5
> line_6
> line_7
> line_8
> line_9
> line_10
>
> here is the desired output:
> line_1
> line_2
> line_3
>
> here is what i do:
> cat input | for (( i=1;i<=3;i++ )); do gawk -v var=$i 'NR == var { print}';
> done
>
> but, the result is always:
> line_1
>
$ for (( i=1;i<=3;i++ )); do gawk -v var=$i 'NR == var { print}' input ; done
You're asking awk to read lines from a file, so you need to give the
file over to awk. The above gives you the output you're looking for.
The bash portion of your script (the loop) and the -v var portion of
your awk command are fine.
--
Chris
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