BSD 2.11 - man page for vipw (bsd section 8)
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vipw - edit the password file
Vipw edits the password file while setting the appropriate locks, and does any necessary
processing after the password file is unlocked. If the password file is already being
edited, then you will be told to try again later. The vi editor will be used unless the
environment variable EDITOR indicates an alternate editor.
Vipw 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 mkpasswd(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 will not be available to programs.
chpass(1), passwd(1), passwd(5), adduser(8), mkpasswd(8)
4th Berkeley Distribution March 11, 1989 VIPW(8)
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