$ dir foo
ls: foo: No such file or directory

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

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

$ dir foo
ls: foo: No such file or directory