09-29-2003
Take a look at the file /etc/passwd. Look at the 4th field (fields are separated by colons). This is the group ID. Use awk to cut out the first field (user ID) and the 4th field (group ID) to get the information that you are after. Note too that a user can belong to more than one group. The group ID in /etc/passwd is the primary group ID.
/etc/passwd info
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pwck(1M) System Administration Commands pwck(1M)
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. The default group file is
/etc/group.
All messages regarding inconsistent entries are placed on the stderr stream.
FILES
/etc/group
/etc/passwd
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
getpwent(3C), group(4), passwd(4), attributes(5)
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.
SunOS 5.10 20 Oct 2002 pwck(1M)