Linux Programming Notes (iv)

I. User and user group management

Add a new user account using the Useradd format useradd option username

1. Create a user Tian where the-d-m parameter is used for logging, the login generates a home directory/usr/tian (where/usr is the parent directory where the default user home directory resides)

2, create a user gem, the user login shell is/bin/sh belong to group groups, while belonging to the ADM and root user group, the command is as follows:

# useradd-s/bin/sh-g Group-g adm, Root gem

3, delete the account, the user account from the/etc/password system files such as the user record deleted, the use of the command as follows:

#userdel-r Sam Delete user account Sam's record in System files (etc/password/etc/shadow/etc/group)

4, modify the account use, the original account changed to a new user name, #usermod-S/bin/ksh-d/home/z-G developer Sam to change the user Sam's login name to Ksh home directory changed to/home/z user group to developer

5, User password management, user account has just been created without a password, but is locked by the system, can not be used, you must specify a password for it to use. Its shell command is passwd, the format passwd option + username, and its parameters are as follows:

6. Disk Management, Linux Disk Management main three parameters, DF: List The total disk usage of the file system, du: Check disk space usage. FDISK: Disk partition. Disk mounts using mount download umount.

Linux Programming Notes (iv)