一、Linux常用命令（总）
二、Linux常用命令（分）
1、pwd – print name of current/working directory
2、cd – change directory
3、ls – list，dieplay directory content
4、date – print or set the system date and time
5、hwclock & clock – query or set the hardware clock (RTC)
6、whereis – locate the binary, source, and manual page files for a command
7、which – shows the full path of (shell) commands
8、shutdown – Halt, power-off or reboot the machine
9、echo – display a line of text
10、file – determine file type
11、type – Display information about command type
12、cat – concatenate files and print on the standard output
13、tac – concatenate and print files in reverse
14、who – show who is logged on
15、w – Show who is logged on and what they are doing
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