get the user list whose primary group is given from HPUX box.

[pjena]

Hi,
I want to get the username list whose primary group is given on HPUX.
I used following program to get the username

main()
{
int i=0;
struct group* grp;
grp = getgrnam("adm_system");
if(grp)
{
printf("%s\n",grp->gr_name);
printf("%s\n",grp->gr_passwd);
printf("%d\n",grp->gr_gid);
while (grp->gr_mem[i] !=NULL)
{
printf("%s\n",grp->gr_mem[i])
i++;
}
}
}
But it is displaying the user list whose secondary group is "adm_system" and also tried with getgrgid(), but it doesn't give the proper result.

Please help me to get the user list whose primary group is "adm_system"

Regards,
Prasant

[Jaime Bolanos Rojas.]

pjena, unless I misundestood you... the way that I would do it is to first find the group id for "adm_system".
Then with that in hand, I would a simple cat /etc/passwd | grep -i adm_system since in the etc/passwd file you will only find the primary group listed for each user.

Hope this help you out.

jaime.

[Jaime Bolanos Rojas.]

pjena, unless I misundestood you... the way that I would do it is to first find the group id for "adm_system".
Then with that in hand, I would do a search for that ID in the group field of the passwd file and it will give you a list of the users that belong to adm-system.

Hope this help you out.

jaime.

[pjena]

Hi Jaime,
Thanks for replying to my query.
I think in NIS implementation, /etc/passwd will not give the proper answer.

If there is some direct system API, then it would be great.

Regards,
Prasant

[Darrel Louis]

Hi Prasant,

Have you tried the logins command:
# logins -g

For more info see man logins.

Darrel

[Peter Nikitka]

Hi,

in your code change from the while statement on to scan the passwd database (does only depend on the entry in nsswitch.conf) something linke this:

setpwent()
while (pw = getpwent()) {
if (!strcmp(pw->pw_gid,grp->gr_gid)) {
do_my_output(...)
}
endpwent();
...

Read 'man getpwnam' and 'SEE ALSO's as well.

mfG Peter

[Jaime Bolanos Rojas.]

OK, did some search already.

The best way to do will be using the ypcat group command and then scramble the data from there.

For a more detailed information, this thread might be able to help you out.

http://forums1.itrc.hp.com/service/forums/bizsupport/questionanswer.do?threadId=27514

Regards,

Jaime.

[Peter Nikitka]

Hi,
correction:
of cource the id's are numeric, so you don't need to compare strings:

setpwent();
while (pw = getpwent()) {
if (pw->pw_gid == grp->gr_gid) {
do_my_output(...)
}
endpwent();
...

mfG Peter