[perl] How can I store the result of a system command in a Perl variable?

Also for eg. you can use IPC::Run:

use IPC::Run qw(run);

my $pid = 5892;
run [qw(top -H -n 1 -p), $pid],
    '|', sub { print grep { /myprocess/ } <STDIN> },
    '|', [qw(wc -l)],
    '>', \my $out;

print $out;
  • processes are running without bash subprocess
  • can be piped to perl subs
  • very similar to shell

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