https://github.com/emersion/mrsh/issues/73 part 2
unspecified.c: don't abort in interactive shells
Check return value of times against (clock_t)-1
Abort when unspecified commands are attempted
Switch FreeBSD build to freebsd/latest
Remove unnecessary argc check from cd
This check was preventing the no-argument form of cd from executing.
Adding getopt implementation
It's pretty simple but I think it covers all of items described in the
Adding handling of symbolic arguments to umask
Reset optind to 0
POSIX states that setting this to 0 is unspecified however setting it
to 1 is causing issues on certain versions of glibc.
Fix error handling in basic frontend
Very basic umask implementation
Doesn't yet support the -S flag, or symbolic modes, but does allow for
getting and setting the umask.
Source ENV, only source ~/.profile if login shell
builtin: fix memory leaks in dot and eval
parser: fix io_number
readme: add link to website, improve refs