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date published categories tags
2023-09-08
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Bash

The most popular Unix/Linux shell in use, and the default for most Linux distributions. This document will include history, configuration, tips, and tricks.

Configuation Files

Bash, when run as a POSIX ([[Unix]]) shell, will only source /etc/profile and then ~/.profile.

When run normally, it will source several files:

As a login shell:

  1. System-wide config: -/etc/profile (which itself will likely execute every script in /etc/profile.d/)
  2. Current-user config: (the first, and only first, of these files it can read:)
    1. ~/.bash_profile
    2. ~/.bash_login
    3. ~/.profile

As an interactive non-login shell, it will instead read:

  1. /etc/bash.bashrc
  2. ~/.bashrc

When logging out, it will read:

  1. ~/.bash_logout

When run as a non-interactive, non-login shell, like as a script, it will read $BASH_ENV, and execute the file name found there.

Globbing

Globbing Tips & Tricks

You can find the first matching file with a wildcard if you use parens when assigning it to a variable:

ch=(/bin/ch*)
echo $ch
# prints /bin/chattr