Linux Common commands

First, the user

1 su Switch User

2 Su-with slash indicates permission to replace User configuration information

Second, network card

1 Ps-ef

Ps-ef|grep sshd to see if the SSH service is started (process number PID)

2 kill-9 Lore

kill-9 pid forced stop SSH Service

3 Service

Service sshd start SSH services

Service sshd restart Restart SSH Services

Service sshd Stop SSH Services

4 ifconfig

Ifconfig viewing the network card IP (enabled)

IFCONFIG-A View all network cards (including disabled)

Ifconfig NIC name Up/down enable/disable a NIC

5 dhclient network card name network card automatically obtain IP

Dhclient (2419) running existing ====> process occupancy

Kill-9 2419 forced stop

Third, Directory

1/root directory

2.. Upper Directory

3 CD jumps to the specified directory (CD/return root), (CD.. Return to parent directory)

4 ls view files and folders in the current directory

5 Ls-l View the details of a file in the current directory

6 ls-a View all files in the current directory (including hidden files)

7 Ls-la View all files in the current directory (in the form of a list)

8 mkdir folder name Create Folder

RmDir folder name Delete directory

Mkdir-p path creation of multi-level catalogs

Rmdir-r path Delete multi-level directory

RMDIR-RF path without prompting for multi-level directory deletions

9 Mount Mount ()

Mount/dev/cdrom/mnt/cdrom attach an app in CDROM to the path you specify

Umount un-mount

Umount/mnt/cdrom Cancel the application mounted to the specified path

Iv. Documents

1 Whereis

Whereis command name search for the path to the command and where the help document is located

Whereis-b ls only looks for executable files

Whereis-b LS only find help documents

2 Touch file name (relative path/absolute path)

3 Cat View Small files

4 Tail viewing large files

TAIL-10 View after 10 lines

HEAD-10 View Top 10 lines

Tail-f View Log log (-F to make it easy to see the log files that are being changed--to show what is constantly updated at the tail)

5 VI file name (Baidu command for VI)

VI Three modes (1, command work mode 2, edit working mode 3, bottom line mode)

6 MV Rename

MV Original name New name

7 CP-FR Copy

CP-FR the path where the original file holds the copy

Five, the Authority

1 d rwxr-xr-x: D directory rwx user rights r-x user group permissions r-x other group permissions

R reads Read W writes write X executes execute

r--===>100 ===> 4 Read-only

R-x ===> 101 ===> 5

rw-===>110 ===> 6

RWX ===> 111 ===> 7

2 chmod g (u/0) + (-) W file Add (cancel) Write permission to group (user/other group)

chmod 777 File name

Chmond 777-r filename included in file (recursive authorization)

Linux Common commands