This executable can spawn an interactive system shell.
This function can be performed by any unprivileged user.
hg --config alias.x='!/bin/sh' x
This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.
hg --config alias.x='!/bin/sh' x
This function is performed by the privileged user if the executable has the SUID bit set and the right ownership because the effective privileges are not dropped.
hg --config alias.x='!/bin/sh' x