Hello World

example:
# pw usermod -n username -g groupname

PW(8)                   FreeBSD System Manager's Manual                  PW(8)

NAME
     pw -- create, remove, modify & display system users and groups

SYNOPSIS
     pw [-V etcdir] useradd [name|uid] [-C config] [-q] [-n name] [-u uid]
        [-c comment] [-d dir] [-e date] [-p date] [-g group] [-G grouplist]
        [-m] [-M mode] [-k dir] [-w method] [-s shell] [-o] [-L class]
        [-h fd | -H fd] [-N] [-P] [-Y]
     pw [-V etcdir] useradd [name|uid] -D [-C config] [-q] [-b dir] [-e days]
        [-p days] [-g group] [-G grouplist] [-k dir] [-M mode] [-u min,max]
        [-i min,max] [-w method] [-s shell] [-y path]
     pw [-V etcdir] userdel [name|uid] [-n name] [-u uid] [-r] [-Y]
     pw [-V etcdir] usermod [name|uid] [-C config] [-q] [-n name] [-u uid]
        [-c comment] [-d dir] [-e date] [-p date] [-g group] [-G grouplist]
        [-l name] [-m] [-M mode] [-k dir] [-w method] [-s shell] [-L class]
        [-h fd | -H fd] [-N] [-P] [-Y]
     pw [-V etcdir] usershow [name|uid] [-n name] [-u uid] [-F] [-P] [-7] [-a]
     pw [-V etcdir] usernext [-C config] [-q]
     pw [-V etcdir] groupadd [group|gid] [-C config] [-q] [-n group] [-g gid]
        [-M members] [-o] [-h fd | -H fd] [-N] [-P] [-Y]
     pw [-V etcdir] groupdel [group|gid] [-n name] [-g gid] [-Y]
     pw [-V etcdir] groupmod [group|gid] [-C config] [-q] [-n name] [-g gid]
        [-l name] [-M members] [-m newmembers] [-d oldmembers] [-h fd | -H fd]
        [-N] [-P] [-Y]
     pw [-V etcdir] groupshow [group|gid] [-n name] [-g gid] [-F] [-P] [-a]
     pw [-V etcdir] groupnext [-C config] [-q]
     pw [-V etcdir] lock [name|uid] [-C config] [-q]
     pw [-V etcdir] unlock [name|uid] [-C config] [-q]