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Full Discussion: Shadow file password policy
Operating Systems Linux Red Hat Shadow file password policy Post 302458554 by zaxxon on Friday 1st of October 2010 05:18:49 AM
Old 10-01-2010
Maybe I should read what I copy and paste to it's full length. I do not know other means they talk about or at least did not try any out - maybe another member of the forum can give you the answer or you just try out yourself some available to you.
Maybe using PAM and bypassing normal Unix login methods, idk.

To check the maximal value of a gid, I guess you take a look into your distributions header files in /usr/include (I checked on a Debian Linux):
Code:
somebox:/usr/include/bits> grep -i gid typesizes.h
#define __GID_T_TYPE            __U32_TYPE
somebox:/usr/include/bits> grep __U32_TYPE types.h
#define __U32_TYPE              unsigned int
__STD_TYPE __U32_TYPE __socklen_t;

I am not totally sure but I think that is what defines the max for the gid in the system. On a 32-bit system this would 2^32-1 ie. 4294967295 afaik.
Just out of curiosity - why do you need to know that?
 

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LEARN ABOUT V7

groupadd

groupadd(1M)						  System Administration Commands					      groupadd(1M)

NAME

       groupadd - add (create) a new group definition on the system

SYNOPSIS

       /usr/sbin/groupadd [ -g gid [-o]] group

DESCRIPTION

       The groupadd command creates a new group definition on the system by adding the appropriate entry to the /etc/group file.

OPTIONS

       The following options are supported:

       -g gid	Assigns  the  group  id  gid  for  the	new group. This group id must be a non-negative decimal integer below MAXUID as defined in
		/usr/include/sys/param.h. The group ID defaults to the next available (unique) number above the highest number currently assigned.
		For  example,  if  groups   100, 105, and  200 are assigned as groups, the next default group number will be  201. (Group IDs from
		0-99 are reserved by SunOS for future applications.)

       -o	Allows the gid to be duplicated (non-unique).

OPERANDS

       The following operands are supported:

       group	A string consisting of characters from the set of lower case alphabetic characters and numeric characters. A warning message  will
		be  written  if  the  string  exceeds MAXGLEN, which is usually set at eight characters. The group field must contain at least one
		character; it accepts lower case or numeric characters or a combination of both, and must not contain a colon  (:) or  NEWLINE.

EXIT STATUS

       The following exit values are returned:

       0	Successful completion.

       2	Invalid command syntax. A usage message for the groupadd command is displayed.

       3	An invalid argument was provided to an option.

       4	The gid is not unique (when  -o option is not used).

       9	The group is not unique.

       10	The  /etc/group file cannot be updated.

FILES

       /etc/group

       /usr/include/userdefs.h

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       users(1B), groupdel(1M), groupmod(1M), grpck(1M), logins(1M), pwck(1M), useradd(1M), userdel(1M), usermod(1M), group(4), attributes(5)

NOTES

       groupadd only adds a group definition to the local system. If a network name service such as NIS or NIS+ is being used  to  supplement  the
       local  /etc/group  file with additional entries, groupadd cannot change information supplied by the network name service. However, groupadd
       will verify the uniqueness of group name and group ID against the external name service.

SunOS 5.10							    27 Mar 1998 						      groupadd(1M)
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