Boost Your Linux Productivity: 8 Powerful History Command Tricks

When you frequently use the Linux command line, leveraging the history command can dramatically improve productivity. This guide presents eight practical techniques.

1. Show timestamps with HISTTIMEFORMAT

Set the environment variable to prepend each command with a date‑time stamp:

export HISTTIMEFORMAT='%F %T '
history | less

2. Search history with Ctrl+r

Press Ctrl+r and type a keyword to perform a reverse incremental search. For example, typing wget brings up the most recent command containing that word, which can then be executed by pressing Enter or edited further.

3. Repeat the previous command

Use !! to run the last command, or !-1 for the same effect.

4. Execute a specific command by number

Prefix an exclamation mark to the line number shown by history to re‑run that command, e.g., !4.

# Example output
[root@localhost ~]# !4
ss -tul
...

5. Control total history lines with HISTSIZE

Check the current size: echo $HISTSIZE # 1000 by default on CentOS 8 Append a new size to .bash_profile and reload:

echo "HISTSIZE=200" >> .bash_profile
source ~/.bash_profile

6. Change the history file name

Set HISTFILE to a custom path in .bash_profile:

echo "HISTFILE=/root/.cmd_hist" >> ~/.bash_profile
reboot

7. Clear the history

Run the -c option to erase the current session’s history:

history -c

8. Disable history entirely

Set both HISTSIZE and HISTFILESIZE to 0 in .bash_profile and source the file:

echo "HISTSIZE=0" >> .bash_profile
echo "HISTFILESIZE=0" >> .bash_profile
source ~/.bash_profile

These configurations let you tailor Bash history behavior to suit auditing, debugging, or privacy needs.