mailx -V (return code: 1)
mailx: invalid option -- '-'
usage: mailx [-dEIinv] [-a header] [-b bcc-addr] [-c cc-addr] [-r from-addr] [-s subject] [--] to-addr ...
mailx [-dEIiNnv] -f [name]
mailx [-dEIiNnv] [-u user]
mailx --help (return code: 1)
mailx: invalid option -- '-'
usage: mailx [-dEIinv] [-a header] [-b bcc-addr] [-c cc-addr] [-r from-addr] [-s subject] [--] to-addr ...
mailx [-dEIiNnv] -f [name]
mailx [-dEIiNnv] [-u user]