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Full Discussion: retrieving all group names with a given group number
Top Forums UNIX for Advanced & Expert Users retrieving all group names with a given group number Post 302240916 by Andrewkl on Saturday 27th of September 2008 03:46:08 AM
Old 09-27-2008
retrieving all group names with a given group number
hi,

which Unix/C function can i use to retrieve all group names with a particular group id?

The following C code prints out the group id number of a particular group name:
------------------------------------------------------------------------
#include <stdio.h>
#include <grp.h>

int main(int argc, char * argv[]){
struct group * info;
char ** members;
int i=1;
if(argc < 2){
fprintf(stderr, "usage: %s groupname\n", argv[0]);
exit(-1);
}
info = getgrnam(argv[1]);
if(info == NULL){
printf("%s: no such group\n", argv[1]);
}
else{
printf("group name: %s\n", info -> gr_name);
printf("group id number: %d\n", info -> gr_gid);
}
}
------------------------------------------------------------------

% a.out vulcan1
group name: vulcan1
group id number: 15100

% a.out vulcan2
group name: vulcan2
group id number: 15100

% a.out vulcan3
group name: vulcan3
group id number: 15100

///////////////////////////////////////////////////
I'm looking for a C function that returns "vulcan1", "vulcan2", and "vulcan3"
when I pass in the group id of 15100 (there are only 3 groups with group id of 15100).


Thanks
--Andrew
 

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LEARN ABOUT REDHAT

gpasswd

GPASSWD(1)						      General Commands Manual							GPASSWD(1)

NAME

       gpasswd - administer the /etc/group file

SYNOPSIS

       gpasswd group
       gpasswd -a user group
       gpasswd -d user group
       gpasswd -R group
       gpasswd -r group
       gpasswd [-A user,...] [-M user,...] group

DESCRIPTION

       gpasswd is used to administer the /etc/group file (and /etc/gshadow file if compiled with SHADOWGRP defined). Every group can have adminis-
       trators, members and a password. System administrator can use -A option to define group administrator(s) and -M option  to  define  members
       and has all rights of group administrators and members.

       Group  administrator  can add and delete users using -a and -d options respectively. Administrators can use -r option to remove group pass-
       word. When no password is set only group members can use newgrp(1) to join the group. Option -R disables access to the group  through  new-
       grp(1) command.

       gpasswd	called by a group administrator with group name only prompts for the group password. If password is set the members can still new-
       grp(1) without a password, non-members must supply the password.

FILES

       /etc/group - group information
       /etc/gshadow - shadow group information

SEE ALSO

       newgrp(1), groupadd(8), groupdel(8), groupmod(8), grpck(8)

AUTHOR

       Rafal Maszkowski <rzm@pdi.net>

																	GPASSWD(1)
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