02-13-2009
passwd command from another server
I made a mistake in a command and zero'd out the useradd and group add commands. Instead of restoring from backups, I copied the same files from another Linux server with the same OS. Everything worked fine, so you should be able to do the same.
It was very frustrating troubleshooting that one since I didn't notice the issue until I went through and tried to add some users on a later day. The command seemed to work because I got no errors, but nothing would appear in the /etc/passwd or group files.
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GRPCK(1) General Commands Manual GRPCK(1)
NAME
grpck - verify integrity of group files
SYNOPSIS
grpck [-r] [group shadow]
DESCRIPTION
grpck verifies the integrity of the system authentication information. All entries in the /etc/group and /etc/gshadow are checked to see
that the entry has the proper format and valid data in each field. The user is prompted to delete entries that are improperly formatted or
which have other incorrectable errors.
Checks are made to verify that each entry has
- the correct number of fields
- a unique group name
- a valid list of members and administrators
The checks for correct number of fields and unique group name are fatal. If the entry has the wrong number of fields, the user will be
prompted to delete the entire line. If the user does not answer affirmatively, all further checks are bypassed. An entry with a dupli-
cated group name is prompted for deletion, but the remaining checks will still be made. All other errors are warnings and the user is
encouraged to run the groupmod command to correct the error.
The commands which operate on the /etc/group file are not able to alter corrupted or duplicated entries. grpck should be used in those
circumstances to remove the offending entry.
OPTIONS
By default, grpck operates on the files /etc/group and /etc/gshadow. The user may select alternate files with the group and shadow parame-
ters. Additionally, the user may execute the command in read-only mode by specifying the -r flag. This causes all questions regarding
changes to be answered no without user intervention. grpck can also sort entries in /etc/group and /etc/gshadow by GID. To run it in sort
mode pass it -s flag. No checks are performed then, it just sorts.
FILES
/etc/group - group account information
/etc/gshadow - encrypted passwords and group administrator information
/etc/passwd - user information
SEE ALSO
group(5), passwd(5), shadow(5), groupmod(8)
DIAGNOSTICS
The grpck command exits with the following values:
0 Success
1 Syntax Error
2 One or more bad group entries
3 Cannot open group files
4 Cannot lock group files
5 Cannot update group files
AUTHOR
Julianne Frances Haugh (jockgrrl@ix.netcom.com)
GRPCK(1)