2007-10-07 17:14:51 +05:30
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.\"$Id: pwconv.8,v 1.9 2001/01/25 10:43:51 kloczek Exp $
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2007-10-07 17:14:44 +05:30
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.TH PWCONV 8 "26 Sep 1997"
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.SH NAME
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pwconv, pwunconv, grpconv, grpunconv \- convert to and from shadow passwords and groups.
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.SH SYNOPSIS
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.B pwconv
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.br
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.B pwunconv
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.br
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.B grpconv
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.br
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.B grpunconv
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.SH DESCRIPTION
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These four programs all operate on the normal and shadow password and
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group files:
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.IR /etc/passwd ", " /etc/group ", " /etc/shadow ", and " /etc/gshadow .
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.B pwconv
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.RI "creates " shadow " from " passwd " and an optionally existing " shadow .
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.B pwunconv
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.RI "creates " passwd " from " passwd " and " shadow " and then removes " shadow .
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.B grpconv
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.RI "creates " gshadow " from " group " and an optionally existing " gshadow .
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.B grpunconv
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.RI "creates " group " from " group " and " gshadow " and then removes " gshadow .
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Each program acquires the necessary locks before conversion.
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.BR pwconv " and " grpconv
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are similiar. First, entries in the shadowed file which don't exist
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in the main file are removed. Then, shadowed entries which don't have
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`x' as the password in the main file are updated. Any missing
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shadowed entries are added. Finally, passwords in the main file are
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replaced with `x'. These programs can be used for initial conversion
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as well to update the shadowed file if the main file is edited by
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hand.
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.B pwconv
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will use the values of
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.BR PASS_MIN_DAYS ", " PASS_MAX_DAYS ", and " PASS_WARN_AGE
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from
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.I /etc/login.defs
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when adding new entries to
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.IR /etc/shadow .
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.RB "Likewise, " pwunconv " and " grpunconv
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are similiar. Passwords in the main file are updated from the
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shadowed file. Entries which exist in the main file but not in the
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shadowed file are left alone. Finally, the shadowed file is removed.
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Some password aging information is lost by
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.BR pwunconv .
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It will convert what it can.
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.SH "BUGS"
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Errors in the password or group files (such as invalid or duplicate
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entries) may cause these programs to loop forever or fail in other
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strange ways. Please run \fBpwck\fR and \fBgrpck\fR to correct any
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such errors before converting to or from shadow passwords or groups.
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.SH "SEE ALSO"
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.BR login.defs (5),
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.BR pwck (8),
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.BR grpck (8),
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.BR shadowconfig (8)
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