$ perl -MIPC::System::Simple=systemx -e'systemx "ls 2>&1"'
"ls 2>&1" failed to start: "No such file or directory" at -e line 1

$ perl -MIPC::System::Simple=systemx -e'systemx "ls", "2>&1"'
ls: 2>&1: No such file or directory
"ls" unexpectedly returned exit value 2 at -e line 1