- Userdel R
- Userdel Command Linux
- Userdel Command Options For Mac 2017
- Userdel Command Options For Mac Os
- Userdel Command Options For Macbook Pro
Jul 22, 2020 Using the userdel command. The basic syntax for using userdel is straightforward. After logging in and assigning yourself as a root user, your command will take the following form; userdel OPTIONS username. For example – userdel –r AlfredoGarcia. However, before you can use the command there are a few things you need to do. Besides Command-O to open documents and Command-P to print them, there is a long list of keyboard combinations specifically for the Finder. Below you will find the list as documented by Apple. The userdel command modifies the system account files, deleting all entries that refer to loginname. The named user must exist. Option-Command-P-R: Reset NVRAM or PRAM. If your Mac is using a firmware password, it ignores this key combination or starts up from macOS Recovery. Shift (⇧): Start up in safe mode. Disabled when using a firmware password. D: Start up to the Apple Diagnostics utility. Or use Option-D to start up to this.
Closes the active window you are currently in. Use Option-Command-W to close all currently active app windows. Further reading: 40 tips to get the most from your Mac (and macOS 'High Sierra.
Name
userdel - delete a user account and related files
Synopsis
userdel [options] LOGIN
Description
The userdel command modifies the system account files, deleting all entries that refer to the user name LOGIN. The named user mustexist.
Options
The options which apply to the userdel command are:
-f, --force
This option forces the removal of the user account, even if the user is still logged in. It also forces userdel to remove the user's home directoryand mail spool, even if another user uses the same home directory or if the mail spool is not owned by the specified user. If USERGROUPS_ENAB is definedto yes in /etc/login.defs and if a group exists with the same name as the deleted user, then this group will be removed, even if it is still the primarygroup of another user.Note: This option is dangerous and may leave your system in an inconsistent state.
The mail spool is defined by the MAIL_DIR variable in the login.defs file.
Configuration
The following configuration variables in /etc/login.defs change the behavior of this tool:
MAIL_DIR (string)
If MAIL_CHECK_ENAB is set to yes, they are also used to define the MAIL environment variable.
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 sameGID).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 than1024 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.
The return code of the script is not taken into account.
Here is an example script, which removes the user's cron, at and print jobs:
echo 'Usage: $0 username'exit 1
fi# Remove cron jobs.
crontab -r -u $1
# Remove at jobs.
# Note that it will remove any jobs owned by the same UID,
# even if it was shared by a different username.
AT_SPOOL_DIR=/var/spool/cron/atjobs
find $AT_SPOOL_DIR -name '[^.]*' -type f -user $1 -delete ;
# Remove print jobs.
lprm $1
# All done.
exit 0
If set to yes, userdel will remove the user's group if it contains no more members, and useradd will create by default a group with thename of the user.
Files
/etc/group
- success
- 1
- can't update password file
- 2
- invalid command syntax
- 6
- specified user doesn't exist
- 8
- user currently logged in
- 10
- can't update group file
- 12
- can't remove home directory
Caveats
userdel will not allow you to remove an account if there are running processes which belong to this account. In that case, you may have to kill thoseprocesses or lock the user's password or account and remove the account later. The -f option can force the deletion of this account.
You should manually check all file systems to ensure that no files remain owned by this user.
You may not remove any NIS attributes on a NIS client. This must be performed on the NIS server.
If USERGROUPS_ENAB is defined to yes in /etc/login.defs, userdel will delete the group with the same name as the user. To avoidinconsistencies in the passwd and group databases, userdel will check that this group is not used as a primary group for another user, and will justwarn without deleting the group otherwise. The -f option can force the deletion of this group.
See Also
chfn(1), chsh(1), passwd(1), login.defs(5), gpasswd(8), groupadd(8), groupdel(8), groupmod(8),useradd(8), usermod(8).
Referenced By
groupmems(8)Name
useradd - create a new user or update default new user information
Synopsis
useradd [options] LOGIN
- Userdel R
- -c, --commentCOMMENT
- Any text string. It is generally a short description of the login, and is currently used as the field for the user's full name.
- -d, --homeHOME_DIR
- The new user will be created using HOME_DIR as the value for the user's login directory. The default is to append the LOGIN name toBASE_DIR and use that as the login directory name. The directory HOME_DIR does not have to exist but will not be created if it ismissing.
- -D, --defaults
- See below, the subsection 'Changing the default values'.
- -e, --expiredateEXPIRE_DATE The date on which the user account will be disabled. The date is specified in the format YYYY-MM-DD.
- -f, --inactiveINACTIVE The number of days after a password expires until the account is permanently disabled. A value of 0 disables the account as soon as the password hasexpired, and a value of -1 disables the feature.
- -g, --gidGROUP The group name or number of the user's initial login group. The group name must exist. A group number must refer to an already existing group.
- -G, --groupsGROUP1[,GROUP2,...[,GROUPN]]]
- A list of supplementary groups which the user is also a member of. Each group is separated from the next by a comma, with no intervening whitespace. Thegroups are subject to the same restrictions as the group given with the -g option. The default is for the user to belong only to the initialgroup.
- -h, --help
- Display help message and exit.
- -k, --skelSKEL_DIR The skeleton directory, which contains files and directories to be copied in the user's home directory, when the home directory is created byuseradd.
- -K, --keyKEY=VALUE Overrides /etc/login.defs defaults (UID_MIN, UID_MAX, UMASK, PASS_MAX_DAYS and others).
- -l, --no-log-init Do not add the user to the lastlog and faillog databases.
- -m, --create-home Create the user's home directory if it does not exist. The files and directories contained in the skeleton directory (which can be defined with the-k option) will be copied to the home directory.
- -M
- Do not create the user's home directory, even if the system wide setting from /etc/login.defs (CREATE_HOME) is set to yes.
- -N, --no-user-group Do not create a group with the same name as the user, but add the user to the group specified by the -g option or by the GROUP variable in/etc/default/useradd.
- -o, --non-unique Allow the creation of a user account with a duplicate (non-unique) UID.
- -p, --passwordPASSWORD The encrypted password, as returned by crypt(3). The default is to disable the password.
- -r, --system Create a system account.
- -s, --shellSHELL
- The name of the user's login shell. The default is to leave this field blank, which causes the system to select the default login shell specified by theSHELL variable in /etc/default/useradd, or an empty string by default.
- -u, --uidUID
- The numerical value of the user's ID. This value must be unique, unless the -o option is used. The value must be non-negative. The default is to usethe smallest ID value greater than 999 and greater than every other user. Values between 0 and 999 are typically reserved for system accounts.
- -U, --user-group Create a group with the same name as the user, and add the user to this group.
- -Z, --selinux-userSEUSER
- The SELinux user for the user's login. The default is to leave this field blank, which causes the system to select the default SELinux user.
- -e, --expiredateEXPIRE_DATE The date on which the user account is disabled.
- -f, --inactiveINACTIVE The number of days after a password has expired before the account will be disabled.
- -g, --gidGROUP The group name or ID for a new user's initial group (when the -N/--no-user-group is used or when the USERGROUPS_ENAB variable is set tono in /etc/login.defs. The named group must exist, and a numerical group ID must have an existing entry.
- -s, --shellSHELL The name of a new user's login shell.
- GID_MAX (number), GID_MIN (number)
- Range of group IDs used for the creation of regular groups by useradd, groupadd, or newusers.
- MAIL_DIR (string)
- The mail spool directory. This is needed to manipulate the mailbox when its corresponding user account is modified or deleted. If not specified, acompile-time default is used.
- MAIL_FILE (string)
- Defines the location of the users mail spool files relatively to their home directory. The MAIL_DIR and MAIL_FILE variables are used by useradd, usermod, and userdel
- PASS_MAX_DAYS (number)
- The maximum number of days a password may be used. If the password is older than this, a password change will be forced. If not specified, -1 will beassumed (which disables the restriction).
- PASS_MIN_DAYS (number)
- The minimum number of days allowed between password changes. Any password changes attempted sooner than this will be rejected. If not specified, -1 will beassumed (which disables the restriction).
- PASS_WARN_AGE (number)
- The number of days warning given before a password expires. A zero means warning is given only upon the day of expiration, a negative value means no warningis given. If not specified, no warning will be provided.
- SYS_GID_MAX (number), SYS_GID_MIN (number)
- Range of group IDs used for the creation of system groups by useradd, groupadd, or newusers.
- SYS_UID_MAX (number), SYS_UID_MIN (number)
- Range of user IDs used for the creation of system users by useradd or newusers.
- UID_MAX (number), UID_MIN (number)
When invoked without the -D option, the useradd command creates a new user account using the values specified on the command line plus thedefault values from the system. Depending on command line options, the useradd command will update system files and may also create the new user's homedirectory and copy initial files.
By default, a group will also be created for the new user (see -g, -N, -U, and USERGROUPS_ENAB).
Options
The options which apply to the useradd command are:
-b, --base-dirBASE_DIR
The default base directory for the system if -dHOME_DIR is not specified. BASE_DIR is concatenated with the account name to define thehome directory. If the -m option is not used, BASE_DIR must exist.If this option is not specified, useradd will use the base directory specified by the HOME variable in /etc/default/useradd, or /home bydefault.
If not specified, useradd will use the default expiry date specified by the EXPIRE variable in /etc/default/useradd, or an empty string (noexpiry) by default.
If not specified, useradd will use the default inactivity period specified by the INACTIVE variable in /etc/default/useradd, or -1 bydefault.
If not specified, the bahavior of useradd will depend on the USERGROUPS_ENAB variable in /etc/login.defs. If this variable is set toyes (or -U/--user-group is specified on the command line), a group will be created for the user, with the same name as her loginname. If thevariable is set to no (or -N/--no-user-group is specified on the command line), useradd will set the primary group of the new user to the valuespecified by the GROUP variable in /etc/default/useradd, or 100 by default.
This option is only valid if the -m (or --create-home) option is specified.
If this option is not set, the skeleton directory is defined by the SKEL variable in /etc/default/useradd or, by default, /etc/skel.
Example: -KPASS_MAX_DAYS=-1 can be used when creating system account to turn off password ageing, even though system account has nopassword at all. Multiple -K options can be specified, e.g.: -KUID_MIN=100-KUID_MAX=499
Note: -KUID_MIN=10,UID_MAX=499 doesn't work yet.
By default, the user's entries in the lastlog and faillog databases are resetted to avoid reusing the entry from a previously deleted user.
useradd will create the home directory unless CREATE_HOME in /etc/login.defs is set to no.
The default behavior (if the -g, -N, and -U options are not specified) is defined by the USERGROUPS_ENAB variable in/etc/login.defs.
This option is only valid in combination with the -o option.
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.
System users will be created with no aging information in /etc/shadow, and their numeric identifiers are choosen in theSYS_UID_MIN-SYS_UID_MAX range, defined in /etc/login.defs, instead of UID_MIN-UID_MAX (and their GID counterparts for thecreation of groups).
Note that useradd will not create a home directory for such an user, regardless of the default setting in /etc/login.defs (CREATE_HOME). Youhave to specify the -m options if you want a home directory for a system account to be created.
The default behavior (if the -g, -N, and -U options are not specified) is defined by the USERGROUPS_ENAB variable in/etc/login.defs.
Changing the default values
When invoked with only the -D option, useradd will display the current default values. When invoked with -D plus other options,useradd will update the default values for the specified options. Valid default-changing options are:-b, --base-dirBASE_DIR
The path prefix for a new user's home directory. The user's name will be affixed to the end of BASE_DIR to form the new user's home directory name,if the -d option is not used when creating a new account.This option sets the HOME variable in /etc/default/useradd.
This option sets the EXPIRE variable in /etc/default/useradd.
This option sets the INACTIVE variable in /etc/default/useradd.
This option sets the GROUP variable in /etc/default/useradd.
This option sets the SHELL variable in /etc/default/useradd.
Notes
The system administrator is responsible for placing the default user files in the /etc/skel/ directory (or any other skeleton directory specified in/etc/default/useradd or on the command line).
Caveats
You may not add a user to a NIS or LDAP group. This must be performed on the corresponding server.
Similarly, if the username already exists in an external user database such as NIS or LDAP, useradd will deny the user account creation request.
Usernames may only be up to 32 characters long.
Configuration
The following configuration variables in /etc/login.defs change the behavior of this tool:
CREATE_HOME (boolean)
Indicate if a home directory should be created by default for new users.This setting does not apply to system users, and can be overriden on the command line.
Userdel Command Linux
to create, move, or delete the user's mailspool.If MAIL_CHECK_ENAB is set to yes, they are also used to define the MAIL environment variable.
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 sameGID).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 than1024 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.
Userdel Command Options For Mac 2017
If MAIL_CHECK_ENAB is set to yes, they are also used to define the MAIL environment variable.
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 sameGID).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 than1024 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.
The return code of the script is not taken into account.
Here is an example script, which removes the user's cron, at and print jobs:
echo 'Usage: $0 username'exit 1
fi# Remove cron jobs.
crontab -r -u $1
# Remove at jobs.
# Note that it will remove any jobs owned by the same UID,
# even if it was shared by a different username.
AT_SPOOL_DIR=/var/spool/cron/atjobs
find $AT_SPOOL_DIR -name '[^.]*' -type f -user $1 -delete ;
# Remove print jobs.
lprm $1
# All done.
exit 0
If set to yes, userdel will remove the user's group if it contains no more members, and useradd will create by default a group with thename of the user.
Files
/etc/group
- success
- 1
- can't update password file
- 2
- invalid command syntax
- 6
- specified user doesn't exist
- 8
- user currently logged in
- 10
- can't update group file
- 12
- can't remove home directory
Caveats
userdel will not allow you to remove an account if there are running processes which belong to this account. In that case, you may have to kill thoseprocesses or lock the user's password or account and remove the account later. The -f option can force the deletion of this account.
You should manually check all file systems to ensure that no files remain owned by this user.
You may not remove any NIS attributes on a NIS client. This must be performed on the NIS server.
If USERGROUPS_ENAB is defined to yes in /etc/login.defs, userdel will delete the group with the same name as the user. To avoidinconsistencies in the passwd and group databases, userdel will check that this group is not used as a primary group for another user, and will justwarn without deleting the group otherwise. The -f option can force the deletion of this group.
See Also
chfn(1), chsh(1), passwd(1), login.defs(5), gpasswd(8), groupadd(8), groupdel(8), groupmod(8),useradd(8), usermod(8).
Referenced By
groupmems(8)Name
useradd - create a new user or update default new user information
Synopsis
useradd [options] LOGIN
- Userdel R
- -c, --commentCOMMENT
- Any text string. It is generally a short description of the login, and is currently used as the field for the user's full name.
- -d, --homeHOME_DIR
- The new user will be created using HOME_DIR as the value for the user's login directory. The default is to append the LOGIN name toBASE_DIR and use that as the login directory name. The directory HOME_DIR does not have to exist but will not be created if it ismissing.
- -D, --defaults
- See below, the subsection 'Changing the default values'.
- -e, --expiredateEXPIRE_DATE The date on which the user account will be disabled. The date is specified in the format YYYY-MM-DD.
- -f, --inactiveINACTIVE The number of days after a password expires until the account is permanently disabled. A value of 0 disables the account as soon as the password hasexpired, and a value of -1 disables the feature.
- -g, --gidGROUP The group name or number of the user's initial login group. The group name must exist. A group number must refer to an already existing group.
- -G, --groupsGROUP1[,GROUP2,...[,GROUPN]]]
- A list of supplementary groups which the user is also a member of. Each group is separated from the next by a comma, with no intervening whitespace. Thegroups are subject to the same restrictions as the group given with the -g option. The default is for the user to belong only to the initialgroup.
- -h, --help
- Display help message and exit.
- -k, --skelSKEL_DIR The skeleton directory, which contains files and directories to be copied in the user's home directory, when the home directory is created byuseradd.
- -K, --keyKEY=VALUE Overrides /etc/login.defs defaults (UID_MIN, UID_MAX, UMASK, PASS_MAX_DAYS and others).
- -l, --no-log-init Do not add the user to the lastlog and faillog databases.
- -m, --create-home Create the user's home directory if it does not exist. The files and directories contained in the skeleton directory (which can be defined with the-k option) will be copied to the home directory.
- -M
- Do not create the user's home directory, even if the system wide setting from /etc/login.defs (CREATE_HOME) is set to yes.
- -N, --no-user-group Do not create a group with the same name as the user, but add the user to the group specified by the -g option or by the GROUP variable in/etc/default/useradd.
- -o, --non-unique Allow the creation of a user account with a duplicate (non-unique) UID.
- -p, --passwordPASSWORD The encrypted password, as returned by crypt(3). The default is to disable the password.
- -r, --system Create a system account.
- -s, --shellSHELL
- The name of the user's login shell. The default is to leave this field blank, which causes the system to select the default login shell specified by theSHELL variable in /etc/default/useradd, or an empty string by default.
- -u, --uidUID
- The numerical value of the user's ID. This value must be unique, unless the -o option is used. The value must be non-negative. The default is to usethe smallest ID value greater than 999 and greater than every other user. Values between 0 and 999 are typically reserved for system accounts.
- -U, --user-group Create a group with the same name as the user, and add the user to this group.
- -Z, --selinux-userSEUSER
- The SELinux user for the user's login. The default is to leave this field blank, which causes the system to select the default SELinux user.
- -e, --expiredateEXPIRE_DATE The date on which the user account is disabled.
- -f, --inactiveINACTIVE The number of days after a password has expired before the account will be disabled.
- -g, --gidGROUP The group name or ID for a new user's initial group (when the -N/--no-user-group is used or when the USERGROUPS_ENAB variable is set tono in /etc/login.defs. The named group must exist, and a numerical group ID must have an existing entry.
- -s, --shellSHELL The name of a new user's login shell.
- GID_MAX (number), GID_MIN (number)
- Range of group IDs used for the creation of regular groups by useradd, groupadd, or newusers.
- MAIL_DIR (string)
- The mail spool directory. This is needed to manipulate the mailbox when its corresponding user account is modified or deleted. If not specified, acompile-time default is used.
- MAIL_FILE (string)
- Defines the location of the users mail spool files relatively to their home directory. The MAIL_DIR and MAIL_FILE variables are used by useradd, usermod, and userdel
- PASS_MAX_DAYS (number)
- The maximum number of days a password may be used. If the password is older than this, a password change will be forced. If not specified, -1 will beassumed (which disables the restriction).
- PASS_MIN_DAYS (number)
- The minimum number of days allowed between password changes. Any password changes attempted sooner than this will be rejected. If not specified, -1 will beassumed (which disables the restriction).
- PASS_WARN_AGE (number)
- The number of days warning given before a password expires. A zero means warning is given only upon the day of expiration, a negative value means no warningis given. If not specified, no warning will be provided.
- SYS_GID_MAX (number), SYS_GID_MIN (number)
- Range of group IDs used for the creation of system groups by useradd, groupadd, or newusers.
- SYS_UID_MAX (number), SYS_UID_MIN (number)
- Range of user IDs used for the creation of system users by useradd or newusers.
- UID_MAX (number), UID_MIN (number)
- Range of user IDs used for the creation of regular users by useradd or newusers.
- UMASK (number) The file mode creation mask is initialized to this value. If not specified, the mask will be initialized to 022.
- USERGROUPS_ENAB (boolean) Enable setting of the umask group bits to be the same as owner bits (examples: 022 -> 002, 077 -> 007) for non-root users, if the uid is the same asgid, and username is the same as the primary group name.
- 2
- invalid command syntax
- 3
- invalid argument to option
- 4
- UID already in use (and no -o)
- 6
- specified group doesn't exist
- 9
- username already in use
- 10
- can't update group file
- 12
- can't create home directory
- 13
- can't create mail spool
- 14
- can't update SELinux user mapping
When invoked without the -D option, the useradd command creates a new user account using the values specified on the command line plus thedefault values from the system. Depending on command line options, the useradd command will update system files and may also create the new user's homedirectory and copy initial files.
By default, a group will also be created for the new user (see -g, -N, -U, and USERGROUPS_ENAB).
Options
The options which apply to the useradd command are:
-b, --base-dirBASE_DIR
The default base directory for the system if -dHOME_DIR is not specified. BASE_DIR is concatenated with the account name to define thehome directory. If the -m option is not used, BASE_DIR must exist.If this option is not specified, useradd will use the base directory specified by the HOME variable in /etc/default/useradd, or /home bydefault.
If not specified, useradd will use the default expiry date specified by the EXPIRE variable in /etc/default/useradd, or an empty string (noexpiry) by default.
If not specified, useradd will use the default inactivity period specified by the INACTIVE variable in /etc/default/useradd, or -1 bydefault.
If not specified, the bahavior of useradd will depend on the USERGROUPS_ENAB variable in /etc/login.defs. If this variable is set toyes (or -U/--user-group is specified on the command line), a group will be created for the user, with the same name as her loginname. If thevariable is set to no (or -N/--no-user-group is specified on the command line), useradd will set the primary group of the new user to the valuespecified by the GROUP variable in /etc/default/useradd, or 100 by default.
This option is only valid if the -m (or --create-home) option is specified.
If this option is not set, the skeleton directory is defined by the SKEL variable in /etc/default/useradd or, by default, /etc/skel.
Example: -KPASS_MAX_DAYS=-1 can be used when creating system account to turn off password ageing, even though system account has nopassword at all. Multiple -K options can be specified, e.g.: -KUID_MIN=100-KUID_MAX=499
Note: -KUID_MIN=10,UID_MAX=499 doesn't work yet.
By default, the user's entries in the lastlog and faillog databases are resetted to avoid reusing the entry from a previously deleted user.
useradd will create the home directory unless CREATE_HOME in /etc/login.defs is set to no.
The default behavior (if the -g, -N, and -U options are not specified) is defined by the USERGROUPS_ENAB variable in/etc/login.defs.
This option is only valid in combination with the -o option.
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.
System users will be created with no aging information in /etc/shadow, and their numeric identifiers are choosen in theSYS_UID_MIN-SYS_UID_MAX range, defined in /etc/login.defs, instead of UID_MIN-UID_MAX (and their GID counterparts for thecreation of groups).
Note that useradd will not create a home directory for such an user, regardless of the default setting in /etc/login.defs (CREATE_HOME). Youhave to specify the -m options if you want a home directory for a system account to be created.
The default behavior (if the -g, -N, and -U options are not specified) is defined by the USERGROUPS_ENAB variable in/etc/login.defs.
Changing the default values
When invoked with only the -D option, useradd will display the current default values. When invoked with -D plus other options,useradd will update the default values for the specified options. Valid default-changing options are:-b, --base-dirBASE_DIR
The path prefix for a new user's home directory. The user's name will be affixed to the end of BASE_DIR to form the new user's home directory name,if the -d option is not used when creating a new account.This option sets the HOME variable in /etc/default/useradd.
This option sets the EXPIRE variable in /etc/default/useradd.
This option sets the INACTIVE variable in /etc/default/useradd.
This option sets the GROUP variable in /etc/default/useradd.
This option sets the SHELL variable in /etc/default/useradd.
Notes
The system administrator is responsible for placing the default user files in the /etc/skel/ directory (or any other skeleton directory specified in/etc/default/useradd or on the command line).
Caveats
You may not add a user to a NIS or LDAP group. This must be performed on the corresponding server.
Similarly, if the username already exists in an external user database such as NIS or LDAP, useradd will deny the user account creation request.
Usernames may only be up to 32 characters long.
Configuration
The following configuration variables in /etc/login.defs change the behavior of this tool:
CREATE_HOME (boolean)
Indicate if a home directory should be created by default for new users.This setting does not apply to system users, and can be overriden on the command line.
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to create, move, or delete the user's mailspool.If MAIL_CHECK_ENAB is set to yes, they are also used to define the MAIL environment variable.
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 sameGID).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 than1024 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.
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useradd and newusers use this mask to set the mode of the home directory they create
It is also used by login to define users' initial umask. Note that this mask can be overriden by the user's GECOS line (if QUOTAS_ENAB is set)or by the specification of a limit with the K identifier in limits(5).
If set to yes, userdel will remove the user's group if it contains no more members, and useradd will create by default a group with thename of the user.
Files
/etc/passwd
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See Also
chfn(1), chsh(1), passwd(1), crypt(3), groupadd(8), groupdel(8), groupmod(8), login.defs(5),newusers(8), userdel(8), usermod(8).