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Operating Systems
AIX
user & groups
Post 302308618 by shockneck on Sunday 19th of April 2009 06:34:41 PM
04-19-2009
Quote:
Code:
#define MAXGRP 2000 /* In GRPLINLEN the 14 represents the ":!:GID LENGTH:" in the group file. */ #define GRPLINLEN (L_cuserid) + ((L_cuserid + 1) * MAXGRP) + 14
Quote:
AIX development does not intend to increase MAXGRP beyond 2000 because it would introduce binary compatiblity problems (due to static definitions) and because of the limited demand for this capabilily.
@OP that does mean for your question No. 2: You cannot have more than 2000 users with a user name length of eight chars in one line in /etc/group (i.e. about 16000 chars). Mind that mkuser lets you create groups with more than 2000 users without complaining and that grpck will not report errors on such groups as long as you stay below the line length limit (e.g. when using usernames shorter than 8 chars). But you have the opportunity to have more than 2k users in one group without (unexpected) problems by using the workaround from AIX 4 times: you define several group names (group1, group2, group3) in several lines that all have the same group ID. This way you can get around that limit without hitting the named binary compatibility problems.
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LEARN ABOUT NETBSD
grpck
grpck(1B) SunOS/BSD Compatibility Package Commands grpck(1B) NAME
grpck - check group database entries SYNOPSIS
/etc/grpck [filename] DESCRIPTION
The grpck utility checks that a file in group(4) does not contain any errors; it checks the /etc/group file by default. FILES
/etc/group ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
groups(1), group(4), passwd(4), attributes(5) DIAGNOSTICS
Too many/few fields An entry in the group file does not have the proper number of fields. No group name The group name field of an entry is empty. Bad character(s) in group name The group name in an entry contains characters other than lower-case letters and digits. Invalid GID The group ID field in an entry is not numeric or is greater than 65535. Null login name A login name in the list of login names in an entry is null. Logname not found in password file A login name in the list of login names in an entry is not in the password file. Line too long A line (including the newline character) in the group file exceeds the maximum length of 512 characters. Duplicate logname entry A login name appears more than once in the list of login names for a group file entry. Out of memory The program cannot allocate memory in order to continue. Maximum groups exceeded for logname A login name's group membership exceeds the maximum, NGROUPS_MAX. SunOS 5.10 10 Jan 2000 grpck(1B)