NAME

       passwd - the password file

DESCRIPTION

       /etc/passwd contains one line for each user account, with seven fields delimited by colons (“:”). These
       fields are:

       •   login name

       •   optional encrypted password

       •   numerical user ID

       •   numerical group ID

       •   user name or comment field

       •   user home directory

       •   optional user command interpreter

       The encrypted password field may be blank, in which case no password is required to authenticate as the
       specified login name. However, some applications which read the /etc/passwd file may decide not to permit
       any access at all if the password field is blank. If the password field is a lower-case “x”, then the
       encrypted password is actually stored in the shadow(5) file instead; there must be a corresponding line
       in the /etc/shadow file, or else the user account is invalid. If the password field is any other string,
       then it will be treated as an encrypted password, as specified by crypt(3).

       The comment field is used by various system utilities, such as finger(1).

       The home directory field provides the name of the initial working directory. The login program uses this
       information to set the value of the $HOME environmental variable.

       The command interpreter field provides the name of the user's command language interpreter, or the name
       of the initial program to execute. The login program uses this information to set the value of the $SHELL
       environmental variable. If this field is empty, it defaults to the value /bin/sh.

FILES

       /etc/passwd
           User account information.

       /etc/shadow
           optional encrypted password file

       /etc/passwd-
           Backup file for /etc/passwd.

           Note that this file is used by the tools of the shadow toolsuite, but not by all user and password
           management tools.

SEE ALSO

       crypt(3), getent(1), getpwnam(3), login(1), passwd(1), pwck(8), pwconv(8), pwunconv(8), shadow(5), su(1),
       sulogin(8).