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An Infosec Prediction: More Human-Based Attacks

bash_shell

There are few things that help one’s efficiency more than being good with
his preferred shell. Many know of the ! option within bash that
allows one to retrieve and run commands from history automatically.

You simply start with a ! and add the first few letters of a command
you’ve recently run, and Bash will run that command for you. I don’t suggest
doing this with rm commands, by the way. 🙂

thor ~ $ !net

executes for me…

thor ~ $ netstat -ntu | awk ‘{print $5}’ | grep -e ^[0-9]

So, yeah…pretty standard.

What’s even cooler, though, and far fewer people know about, is the ability
to search through your history rather than having to guess with the
! option.

Just type ctrl-r from the bash prompt and you’ll get this:

(reverse-i-search)`’:

Now start typing something you’ve run recently and
Bash will intelligently search your history and autocomplete your
commands for you, based on how recently you ran them
. Just press enter to run it, or press escape to edit it first. ::

May 23, 2025

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