Create a new user (LINUX)

The useradd command allows to add a single user to the system.

useradd [options] [user]

Options
-c comment Comments
-d dir Home directory. The default is to use user as the directory name under the home directory specified with the -D option.
-e date Account expiration date.
-f days Permanently disable account this many days after the password has expired.
-g group Initial group name or ID number.
-G groups Supplementary groups given by name or number in a comma-separated list with no whitespace.
-k [dir] Copy default files to the user's home directory. Meaningful only when used with the -m option. Default files are copied from /etc/skel/ unless an alternate dir is specified.
-m Make user's home directory if it does not exist. The default is not to make the home directory.
-M Do not create a home directory for the user, even if the system default in /etc/login.defs is to create one.
-p passwd The encrypted password, as returned by crypt.
-s shell Login shell.
-u uid Numerical user ID. The value must be unique unless the -o option is used. The default value is the smallest ID value greater than 99 and greater than every other uid.

-D [options] Set or display defaults. If options are specified, set them. If no options are specified, display current defaults.
Set or display defaults. If options are specified, set them. If no options are specified, display current defaults. The options are:
-b dir Home directory prefix to be used in creating home directories. If the -d option is not used when creating an account, the user name will be appended to dir.
-e date Expire date. Requires the use of shadow passwords.
-f days Number of days after a password expires to disable an account. Requires the use of shadow passwords.
-g group Initial group name or ID number.
-s shell Default login shell.

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