History history control

Every command we operate is often recorded by the machine, and some sensitive operation commands are blocked for security purposes.

Set the default number of records in Linux:

Temporary effect:

Export histsize = 5

History

Valid permanently:

Echo "Export histseze = 5">/etc/profile

./Etc/profile or source/etc/profile // The configuration must take effect.

 

Control history files: variable of the number of historical records in the command line

Cat ~ /. Bash_history

Variable of the number of commands in the history file (~ /. Bash_history)

Temporary effect:

Export histfilesize = 5

History

 

Valid permanently:

Echo "histfilesize = 5">/etc/profile

./Etc/profile or source/etc/profile // The configuration must take effect.

 

Clear history: history-C

 

Command to clear a specified record:

History-D row number

 

History history control