Tell me, please, why awk does not transmit an external variable to the template. Sample script:

#/bin/sh PROTO="tcp" LINES=(`sudo /sbin/iptables --numeric --line-numbers --list INPUT | awk -v prt=$PROTO '/prt/ {print $1}'`) echo ${LINES[@]}

Conclusion: an empty array.

Closed due to the fact that off-topic participants Wiktor Stribiżew , AK ♦ , Dmitry Kozlov , user192664, Let's say Pie 10 Nov '18 at 10:39 .

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    1 answer 1

    Error in specifying a template, valid line:

     LINES=(`sudo /sbin/iptables --numeric --line-numbers --list INPUT | awk -v prt=$PROTO '$0 ~ prt {print $1}'`)