A preceding space prevents dangerous commands from going into history
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Assim Hussain shared on Twitter that he executed a dangerous command by mistake. The command was still accessible in his shell history, and he pressed the UP arrow one time too much.
I have been in that situation, and you may have been, also. 🙈
I like about Twitter that sometimes people reply with useful tips to avoid future mistakes. So did Philippe Martin. He shared that commands executed with a preceding space will not go it into the session history. That sounds great!
# command goes into the history $ delete everything # command does not go into the history $ delete everything
I tried it right away, but it didn't work. I'm a Zsh user, and it turns out that you have to enable it via a config in your
In bash, it should work right away (not tested).
Edited: In bash, the environment variable
HISTCONTROL has to be set.
There is one thing to mention though. After the execution of a command, every command will be accessible by pressing the UP arrow (this is a feature). Only when you execute another command preceding space command will be inaccessible.
This little trick prevents your future self from executing a dangerous command when pressing the UP arrow one time too much. 🎉