History

This section provides an overview of commands and configurations related to the command history in a Unix/Linux shell.

View

This subsection explains how to view and search through the command history.

Lists all previously executed commands.

$ history

Explains how to search for specific commands in the history using grep and shortcuts.

$ history | grep sudo
$ !sudo:p 
$ !18:p

Describes how to use interactive search to find commands in the history.

Ctrl + R

This subsection covers the actions that can be performed on the command history.

Shows how to re-execute specific commands from the history.

$ !sudo
$ !18

Explains how to clear the command history.

$ history -cw
$ > ~/.bash_history

This subsection details the possible configurations for the command history.

Indicates how to add a timestamp to each command in the history.

$ echo "export HISTTIMEFORMAT='%F, %T '" >> ~/.bashrc
$ source ~/.bashrc

Explains how to increase the default command history length.

$ echo "HISTSIZE=10000" >> ~/.bashrc
$ echo "HISTFILESIZE=10000" >> ~/.bashrc    
$ source ~/.bashrc

Shows how to configure direct writing of commands to the history file.

$ echo "PROMPT_COMMAND='history -a'" >> ~/.bashrc   
$ source ~/.bashrc