VIPW(8) BSD System Manager's Manual VIPW(8)
vipw -- edit the password file
vipw [-d directory]
The 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 another user, vipw will ask you to try again later. The default edi-
tor for vipw is vi(1).
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.
The 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, vipw uses pwd_mkdb(8) 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.
If the following environment variable exists it will be utilized by vipw:
EDITOR The editor specified by the string EDITOR will be invoked instead of the
default editor vi(1). This can be used to allow a script to non-interac-
tively modify the password file.
PW_SCAN_BIG_IDS See pwd_mkdb(8).
chpass(1), passwd(1), passwd(5), adduser(8), pw(8), pwd_mkdb(8)
The vipw utility appeared in 4.0BSD.
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 precision, EDITOR has to run for at
least one second. Non-interactive editor scripts should invoke sleep(1) or equivalent to
ensure this happens.
BSD February 14, 2012 BSD