# Note: Unix-focused — uses $ENV{PATH} and -x file test. For cross-platform/Windows support, # consider IPC::Cmd::can_run or modules like File::Which / Win32::Which.
perl -ne 'print $p, $_ if /you/ && $p=~/he/; $p = $_' para.txt perl -ne 'print $p if /you/ && $p=~/he/; $p = $_' para.txt perl -ne 'print if /you/ && $p=~/he/; $p ...
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