I ran across two surprising sources of code execution in bash (and probably other shells) recently. In a historic context these probably weren't too serious of a problem, but in the context of CI systems where everything is a rats' nest of shell and YAML they could be useful execution primitives. Source 1: arithmetic expressions (a.k.a. "white-collar eval") Leading question aside, do you think this snippet of bash1 can run arbitrary code? function guess() { num="${1}" if [[ "${num}" -eq 42 ]] th...