Answer: linux bash internal command history can display the command history of the command line and the execution history of the default environment.

After a command, usually only the serial number of the executed command and the command itself are displayed.

If you want to view the timestamp of the command history, you can execute:

# export HISTTIMEFORMAT='%F %T '

# History | More

Service network restart

19:02:39 exit

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The format of the display changes to serial number-time-command line.

Other basic functions of history:

1. Use HISTSIZE to control the total number of rows recorded by historical commands.

Append the following two lines to. Bash_profile file and log in to bash shell again, and the number of command histories will become 450.