rdate: invalid option -- '-' Usage: rdate [-46acnpsv] [-o port] host -4: use IPv4 only -6: use IPv6 only -a: use adjtime instead of instant change -c: correct leap second count -n: use SNTP instead of RFC868 time protocol -o num: override time port with num -p: just print, don't set -s: just set, don't print -u: use UDP instead of TCP as transport -v: verbose output

rdate: invalid option -- '-' Usage: rdate [-46acnpsv] [-o port] host -4: use IPv4 only -6: use IPv6 only -a: use adjtime instead of instant change -c: correct leap second count -n: use SNTP instead of RFC868 time protocol -o num: override time port with num -p: just print, don't set -s: just set, don't print -u: use UDP instead of TCP as transport -v: verbose output