edit the password file
vipw utility 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
vipw will ask you to try again later.
The default editor for
When run without options,
vipw will work
with the password files in /etc. The
-d option may be used to specify an alternative
directory to work with.
vipw utility performs a number of
consistency checks on the password entries, and will not allow a password
file with a “mangled” entry to be installed. If
vipw rejects the new password file, the user is
prompted to re-enter the edit session.
Once the information has been verified,
If the following environment variable exists it will be utilized by
to update the user database. This is run in the background, and, at very
large sites could take several minutes. Until this update is completed, the
password file is unavailable for other updates and the new information is
not available to programs.
- The editor specified by the string
EDITOR will be
invoked instead of the default editor
This can be used to allow a script to non-interactively modify the
vipw utility appeared in
The mechanism for checking for password file modifications requires that the
modification time of the password file changes. This means that in a default
configuration where file system timestamps are not calculated with sub-second
EDITOR has to run for at least one second.
Non-interactive editor scripts should invoke
or equivalent to ensure this happens.