The `pgrep -x` command will report an error message when performing a length check.

if `-x `is used the length check is off by two characters (due to added ^$) - ie. `cargo run pgrep -x 12345678901234` will trigger the message. ```shell $ cargo run -q pgrep -x 12345678901234 pgrep: pattern that searches for process name longer than 15 characters will result in zero matches Try `pgrep -f' option to match against the complete command line. ```