Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
PWD_MKDB(8)		  BSD System Manager's Manual		   PWD_MKDB(8)

     pwd_mkdb -- generate the password databases

     pwd_mkdb [-c] [-p]	[-d directory] [-u username] file

     Pwd_mkdb creates db(3) style secure and insecure databases	for the	speci-
     fied file.	 These databases are then installed into /etc/spwd.db and
     /etc/pwd.db respectively.	The file is installed into /etc/master.passwd.
     The file must be in the correct format (see passwd(5)).  It is important
     to	note that the format used in this system is different from the his-
     toric Version 7 style format.

     The options are as	follows:

     -c	   Check if the	password file is in the	correct	format.	Do not change,
	   add,	or remove any files.

     -p	   Create a Version 7 style password file and install it into

     -d	directory
	   Store databases into	specified destination directory	instead	of

     -u	username
	   Only	update the record for the specified user.  Utilities that op-
	   erate on a single user can use this option to avoid the overhead of
	   rebuilding the entire database.

     The two databases differ in that the secure version contains the user's
     encrypted password	and the	insecure version has an	asterisk (``*'')

     The databases are used by the C library password routines (see

     Pwd_mkdb exits zero on success, non-zero on failure.

     /etc/pwd.db		       The insecure password database file.
     /etc/pwd.db.tmp		       A temporary file.
     /etc/spwd.db		       The secure password database file.
     /etc/spwd.db.tmp		       A temporary file.
     /etc/master.passwd		       The current password file.
     /etc/passwd		       A Version 7 format password file.

     Because of	the necessity for atomic update	of the password	files,
     pwd_mkdb uses rename(2) to	install	them.  This, however, requires that
     the file specified	on the command line live on the	same file system as
     the /etc directory.

     There are the obvious races with multiple people running pwd_mkdb on dif-
     ferent password files at the same time.  The front-ends to	pwd_mkdb,
     chpass(1),	passwd(1) and vipw(8), handle the locking necessary to avoid
     this problem.

     Previous versions of the system had a program similar to pwd_mkdb,
     mkpasswd(8), which	built dbm(3) style databases for the password file but
     depended on the calling programs to install them.	The program was	re-
     named in order that previous users	of the program not be surprised	by the
     changes in	functionality.

     chpass(1),	passwd(1), db(3), getpwent(3), passwd(5), vipw(8)

BSD				 June 6, 1993				   BSD


Want to link to this manual page? Use this URL:

home | help