How to check all commands which I used   Use this  command.     # history     history command example  Obvious from output, the history command do not output the time stamp with the log of last executed commands. Any solution for this? Yeah! Run the below command.     # HISTTIMEFORMAT="%d/%m/%y %T " # history           Explanation of commands and switches.  history – GNU History Library  HISTIMEFORMAT – Environmental Variable       %d – Day  %m – Month  %y – Year  %T – Time Stamp       source – in short send the contents of file to shell  .bashrc – is a shell script that BASH runs whenever it is started interactively.   history Command Logs   Byrockatardevil