A linux command (31) every day:/etc/group file details

A linux command (31) every day:/etc/group file detailed links: A linux command every day (1): ls command running (2): cd command http://www.2cto.com/ OS /201210/163050.html#every day.
One linux command every day (31):/etc/group file detailed links: One linux command every day (1): ls command http://www.2cto.com/os/201210/163049.html ; One linux command every day (2): cd command http://www.2cto.com/os/201210/163050.html ; One linux command every day (3): pwd command http://www.2cto.com/os/201210/163462.html ; One linux command every day (4): mkdir command http://www.2cto.com/os/201210/163463.html ; One linux command every day (5): rm command http://www.2cto.com/os/201210/163662.html ; One linux command (6) every day: rmdir command http://www.2cto.com/os/201210/164017.html ; One linux command (7) every day: mv command http://www.2cto.com/os/201210/164247.html ; One linux command every day (8): cp command http://www.2cto.com/os/201210/164254.html ; One linux command every day (9): touch Command http://www.2cto.com/os/201211/165699.html ; One linux command every day (10): cat command http://www.2cto.com/os/201211/165989.html ; One linux command every day (11): nl command http://www.2cto.com/os/201211/165990.html One linux command every day (12): more command http://www.2cto.com/os/201211/165994.html One linux command every day (13): less command http://www.2cto.com/os/201211/165998.html One linux command every day (14): head Command http://www.2cto.com/os/201211/166191.html One linux command every day (15): tail command http://www.2cto.com/os/201211/168702.html One linux command every day (16): which command http://www.2cto.com/os/201211/168890.html A linux command (17) every day: whereis command http://www.2cto.com/os/201211/168893.html One linux command (18) every day: locate command http://www.2cto.com/os/201211/168895.html One linux command every day (19): find command overview http://www.2cto.com/os/201211/168897.html One linux command every day (20): find command exec http://www.2cto.com/os/201211/168901.html One linux command (21) every day: find command xargs http://www.2cto.com/os/201211/168903.html A linux command (22) every day: detailed description of the parameters of the find Command http://www.2cto.com/os/201211/168912.html A linux command (23) every day: Linux directory structure http://www.2cto.com/os/201211/170430.html One linux command every day (24): Linux file type and extension http://www.2cto.com/os/201211/170431.html One linux command every day (25): Explanation of linux file attributes http://www.2cto.com/os/201211/170434.html One linux command every day (26): use SecureCRT to upload and download files http://www.2cto.com/os/201211/172022.html One linux command every day (27): linux chmod command http://www.2cto.com/os/201211/172028.html One linux command every day (28): tar command http://www.2cto.com/os/201212/172641.html One linux command (29) every day: chgrp command http://www.2cto.com/os/201212/172983.html One linux command every day (30): chown command http://www.2cto.com/os/201212/173239.html Both the Linux/etc/group file and the/etc/passwd and/etc/shadow files contain files related to the system administrator's management of users and user groups. The linux/etc/group file is a file on which the system administrator manages users and user groups. all information about the linux user group is stored in the/etc/group file. A user Group is a collection of users with some common features ). The user Group configuration files include/etc/group and/etc/gshadow./etc/gshadow is the encrypted information file of/etc/group. Grouping users at www.2cto.com is a way to manage users and control access permissions in Linux. Each user belongs to a user group. a group can contain multiple users, and a user can belong to different groups. When a user is a member of multiple groups at the same time, the main group to which the user belongs is recorded in the/etc/passwd file, that is, the default group to which the user belongs during logon, other groups are called additional groups. All user group information is stored in the/etc/group file. The format of this file is separated by a colon (:). The fields are as follows: Group name: Password: group ID number: Group User list specific explanation: Group name: the group name is the name of the user group, which consists of letters or numbers. Same as the login name in/etc/passwd, the group name should not be repeated. Www.2cto.com password: the password field stores the encrypted password of the user group. Generally, users in Linux do not have a password, that is, this field is generally blank, or *. Group ID: similar to the user ID, the group ID is also an integer used internally to identify the group. GID. group user list: a list of all users in this group. different users are separated by commas. This user group may be the user's primary group or an additional group. Example: output: [root @ localhost test6] # cat/etc/grouproot: x: 0: root, linuxsirbin: x: 1: root, bin, daemondaemon: x: 2: root, bin, daemonsys: x: 3: root, bin description: We use root: x: 0: root, linuxsir as an example: User Group root, x is the password segment, indicates that no password is set, GID is 0, and the root user group includes root, linuxsir, and other users whose GID is 0.