You have three different languages seemingly confused (sh, awk, and Perl).

If the second program is a shell script, while (my $var = <STDIN>) is wrong. (You probably need something like read var.) If it is in Perl, you can't invoke awk just by mentioning it; you need system or something like that.

In reply to Re^3: pass variable to another process when invoking from command line by gaal
in thread pass variable to another process when invoking from command line by vineet2004

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