PWCK(8) Maintenance Commands and Procedures PWCK(8)
NAME
pwck, grpck - password/group file checkers
SYNOPSIS
/usr/sbin/pwck [
filename]
/usr/sbin/grpck [
filename]
DESCRIPTION
pwck scans the password file and notes any inconsistencies. The
checks include validation of the number of fields, login name, user
ID, group ID, and whether the login directory and the program-to-use-
as-shell exist. The default password file is
/etc/passwd.
grpck verifies all entries in the
group file. This verification
includes a check of the number of fields, group name, group ID,
whether any login names belong to more than
NGROUPS_MAX groups, and
that all login names appear in the password file.
grpck also issues a
warning if it finds an entry (a single line) in the
group file longer
than 2047 characters. Such an entry causes group maintenance
commands, such as
groupdel(8) and
groupmod(8), to fail.
The default group file is
/etc/group.
All messages regarding inconsistent entries are placed on the
stderr stream.
FILES
o
/etc/group o
/etc/passwdSEE ALSO
getpwent(3C),
group(5),
passwd(5),
attributes(7),
groupdel(8),
groupmod(8)DIAGNOSTICS
Group entries in
/etc/group with no login names are flagged.
Group file 'filename' is empty The
/etc/passwd or
/etc/group file is an empty file.
cannot open file filename: No such file or directory The
/etc/passwd or
/etc/group file does not exist.
NOTES
If no filename argument is given,
grpck checks the local group file,
/etc/group, and also makes sure that all login names encountered in
the checked group file are known to the system
getpwent(3C) routine.
This means that the login names may be supplied by a network name
service.
August 27, 2008 PWCK(8)
