edits the password file after setting the appropriate locks,
and does any necessary processing after the password file is unlocked.
If the password file is already locked for editing by another user,
will ask you
to try again later. The default editor for
edits the group file in the same manner as vipw.
If the following environment variable exists it will be utilized by
The editor specified by the string
will be invoked instead of the default editor
command appeared in
BSD 4.0 .
command appeared in Util-Linux 2.6.