pwck, grpck — Password/Group File Checkers
Synopsis
/usr/sbin/pwck [filename] /usr/sbin/grpck [filename]
Description
Use the pwck command to scan the password file and to note 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.
Use the grpck command to verify 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. The default group file is /etc/group.
Note
If you specify no filename argument, grpck checks ...
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