Bash aka The Solution for Everything — The ”Special Files”

In bash, the shell reads one or more startup files. Here’s the details about what’s what and which is run when.

  1. /etc/profile is executed automatically at login.
  2. The file from the list of ~/.bash_profile, ~/.bash_login, or ~/.profile are then executed at login.
  3. ~/.bashrc is executed by every non-login shell, but if sh is used to invoke bash it reads the $ENV for POSIX compatability.

For reference, the ~ symbol is used in place of the user directory. One way to check this out yourself is to change directory to ~ with a cd ~ in the shell, then type pwd which will give the current directory. You’ll find that it is something like /Users/adron where instead of my name it’d be your user name.

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