$ strace -fqeexecve perl -e 'open FH, "echo foo bar ; 2>&1 |"; print <FH>'
execve("/usr/bin/perl", ["perl", "-e", "open FH, \"echo foo bar ; 2>&1 |\""...], [/* 77 vars */]) = 0
[pid  1833] execve("/bin/sh", ["sh", "-c", "echo foo bar ; 2>&1"], [/* 77 vars */]) = 0
foo bar