*) For easily testing in shell scripts whether some command
'openssl XXX' exists, the new pseudo-command 'openssl no-XXX'
- returns with exit code 0 iff a command of the given name is available.
+ returns with exit code 0 iff no command of the given name is available.
'no-XXX' is printed in this case, 'XXX' otherwise. In both cases,
the output goes to stdout and nothing is printed to stderr.
Additional arguments are always ignored.