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----
-
-title: Useful Bash variables
-
-date: 2020-11-12 1
-
-layout: post
-
-lang: en
-
-ref: useful-bash-variables
-
-eu_categories: shell
-
----
-
-[GNU Bash][gnu-bash] has a few two letter variables that may be useful when
-typing on the terminal.
-
-[gnu-bash]: https://www.gnu.org/software/bash/
-
-## `!!`: the text of the last command
-
-The [`!!` variable][previous-command] refers to the previous command, and I find
-useful when following chains for symlinks:
-
-[previous-command]: https://www.gnu.org/software/bash/manual/bash.html#Event-Designators
-
-```shell
-$ which git
-/run/current-system/sw/bin/git
-$ readlink $(!!)
-readlink $(which git)
-/nix/store/5bgr1xpm4m0r72h9049jbbhagxdyrnyb-git-2.28.0/bin/git
-```
-
-It is also useful when you forget to prefix `sudo` to a command that requires
-it:
-
-```shell
-$ requires-sudo.sh
-requires-sudo.sh: Permission denied
-$ sudo !!
-sudo ./requires-sudo.sh
-# all good
-```
-
-Bash prints the command expansion before executing it, so it is better for you
-to follow along what it is doing.
-
-## `$_`: most recent parameter
-
-The [`$_` variable][recent-parameter] will give you the most recent parameter
-you provided to a previous argument, which can save you typing sometimes:
-
-```shell
-# instead of...
-$ mkdir -p a/b/c/d/
-$ cd a/b/c/d/
-
-# ...you can:
-$ mkdir -p a/b/c/d/
-$ cd $_
-```
-
-[recent-parameter]: https://www.gnu.org/software/bash/manual/bash.html#Special-Parameters
-
-## Conclusion
-
-I wouldn't use those in a script, as it would make the script terser to read, I
-find those useful shortcut that are handy when writing at the interactive
-terminal.