From the command line try:
For a lot of reasons it is a really, really bad idea to try to exceed this value:
applications using (_POSIX_)LOGIN_NAME_MAX for usernames will segfault.
LDAP will not work.
Other PAM schemes will not work.
OpenSSH protocol 1 will fail with overlong usernames.
/etc/rhosts won't work for users on your box connecting to remote boxes
I don't think anything good will come from this but try editing /etc/default/login.defs.
CentOS follows Red Hat useradd conventions, see: /etc/default/useradd
I have been told that my college wants to implement LDAP. This creates a problem for me because my users active directory names and email user names differ from their unix system logins. Is there any way to make the Unix usernames more compliant to my user's other account usernames??? We use... (1 Reply)
Hi all,
I tried to write a shell to read huge file and eliminate max length record which is wrong generated record. But I get an error
remove_sp.sh: line 27: syntax error near unexpected token `else'
remove_sp.sh: line 27: ` else $LINE >> REJFILE'
My shell is here:
#!/bin/sh... (5 Replies)
Hi all,
I have a flat file of 1000 rows. I want to check the length of the 5th column. The one having the longest length , I want to set it as DEFINED PARAMETER.
So later I can check others with that particular number only.
Any ideas ?? (2 Replies)
Hi,
I need to create a file of record length more than 300 characters.
But in my unix box, i am able to create a file only with a maximum of 256 characters per record.
Is there anyway i can create a file with more than 300 characters in this case?
Or How to increase the maximum record... (1 Reply)
Hello All,
I am using RHEL 4. Currently maximum password length limit is set to 8 on my system.
Please tell what do i need to change to increase this limit to say 20. I changed the login.defs and included the following line -
"
PASS_MAX_LEN 20
"
but this dint work.
I further... (7 Replies)
Hi
I want to know the maximum length of user name under NIS? I tried googling but it didnt help :(. If there is any command to find out this please let me know. I know on unix user name should be 8 characters long but just i want to know if i can have 9 letter user under mapped under NIS. (1 Reply)
Hello,
In shared memory, when using shmget function, first parameter is ket_t key.
I know it is an integer type, but length of it is system dependent. That means may not be have integer's ranges.
What is range of key_t in Linux? Is it different in distros, for example in ubuntu & fedora? (2 Replies)
Hey Any one...
Do u know any way I can modify the max username length in unix? I guess it is 32/64 characters by default. Suppose I want to increase it to 128.
i hav tried /etc/skel
but no use...
How can I do that? (2 Replies)
Discussion started by: MayureshRisbud
2 Replies
LEARN ABOUT CENTOS
groupadd
GROUPADD(8) System Management Commands GROUPADD(8)NAME
groupadd - create a new group
SYNOPSIS
groupadd [options] group
DESCRIPTION
The groupadd command creates a new group account using the values specified on the command line plus the default values from the system.
The new group will be entered into the system files as needed.
OPTIONS
The options which apply to the groupadd command are:
-f, --force
This option causes the command to simply exit with success status if the specified group already exists. When used with -g, and the
specified GID already exists, another (unique) GID is chosen (i.e. -g is turned off).
-g, --gid GID
The numerical value of the group's ID. This value must be unique, unless the -o option is used. The value must be non-negative. The
default is to use the smallest ID value greater than or equal to GID_MIN and greater than every other group.
See also the -r option and the GID_MAX description.
-h, --help
Display help message and exit.
-K, --key KEY=VALUE
Overrides /etc/login.defs defaults (GID_MIN, GID_MAX and others). Multiple -K options can be specified.
Example: -K GID_MIN=100 -K GID_MAX=499
Note: -K GID_MIN=10,GID_MAX=499 doesn't work yet.
-o, --non-unique
This option permits to add a group with a non-unique GID.
-p, --password PASSWORD
The encrypted password, as returned by crypt(3). The default is to disable the password.
Note: This option is not recommended because the password (or encrypted password) will be visible by users listing the processes.
You should make sure the password respects the system's password policy.
-r, --system
Create a system group.
The numeric identifiers of new system groups are chosen in the SYS_GID_MIN-SYS_GID_MAX range, defined in login.defs, instead of
GID_MIN-GID_MAX.
-R, --root CHROOT_DIR
Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory.
CONFIGURATION
The following configuration variables in /etc/login.defs change the behavior of this tool:
GID_MAX (number), GID_MIN (number)
Range of group IDs used for the creation of regular groups by useradd, groupadd, or newusers.
The default value for GID_MIN (resp. GID_MAX) is 1000 (resp. 60000).
MAX_MEMBERS_PER_GROUP (number)
Maximum members per group entry. When the maximum is reached, a new group entry (line) is started in /etc/group (with the same name,
same password, and same GID).
The default value is 0, meaning that there are no limits in the number of members in a group.
This feature (split group) permits to limit the length of lines in the group file. This is useful to make sure that lines for NIS
groups are not larger than 1024 characters.
If you need to enforce such limit, you can use 25.
Note: split groups may not be supported by all tools (even in the Shadow toolsuite). You should not use this variable unless you really
need it.
SYS_GID_MAX (number), SYS_GID_MIN (number)
Range of group IDs used for the creation of system groups by useradd, groupadd, or newusers.
The default value for SYS_GID_MIN (resp. SYS_GID_MAX) is 101 (resp. GID_MIN-1).
FILES
/etc/group
Group account information.
/etc/gshadow
Secure group account information.
/etc/login.defs
Shadow password suite configuration.
CAVEATS
Groupnames may only be up to 32 characters long.
You may not add a NIS or LDAP group. This must be performed on the corresponding server.
If the groupname already exists in an external group database such as NIS or LDAP, groupadd will deny the group creation request.
EXIT VALUES
The groupadd command exits with the following values:
0
success
2
invalid command syntax
3
invalid argument to option
4
GID not unique (when -o not used)
9
group name not unique
10
can't update group file
SEE ALSO chfn(1), chsh(1), passwd(1), gpasswd(8), groupdel(8), groupmod(8), login.defs(5), useradd(8), userdel(8), usermod(8).
shadow-utils 4.1.5.1 05/25/2012 GROUPADD(8)