groups(1) [ultrix man page]

groups(1)						      General Commands Manual							 groups(1)

Name
       groups - show group memberships

Syntax
       groups [user]

Description
       The command shows the groups to which the specified user belongs determined by reading These are the groups that will be in effect the next
       time the usr logs in.  If the command is used without the usr argument, it will report the groups currently  in	effect	using  the  system
       call. If the file was changed after the login, this may not be the same.

       Each  user belongs to a group specified in the password file and possibly to other groups as specified in the file If you do not own a file
       but you do belong to the group by which it is owned, you are granted group access to the file.

       When a new file is created it is given the group specifications of the directory in which it resides.

Files
See Also
       setgroups(2)

																	 groups(1)

GETGROUPLIST(3) 					   BSD Library Functions Manual 					   GETGROUPLIST(3)

NAME

     getgrouplist -- calculate group access list

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     getgrouplist(const char *name, gid_t basegid, gid_t *groups, int *ngroups);

DESCRIPTION

     The getgrouplist() function reads through the group file and calculates the group access list for the user specified in name.  The basegid is
     automatically included in the groups list.  Typically this value is given as the group number from the password file.

     The resulting group list is returned in the array pointed to by groups.  The caller specifies the size of the groups array in the integer
     pointed to by ngroups; the actual number of groups found is returned in ngroups.

RETURN VALUES

     The getgrouplist() function returns 0 on success and -1 if the size of the group list is too small to hold all the user's groups.	Here, the
     group array will be filled with as many groups as will fit.

FILES

     /etc/group  group membership list

SEE ALSO

     setgroups(2), initgroups(3)

HISTORY

     The getgrouplist() function first appeared in 4.4BSD.

BSD
								 October 26, 2014							       BSD