Tailoring Shell Behavior
To configure all your shells to work in a particular way, edit the file .bash_profile in your home directory. This file executes each time you open bash in Terminal or log in remotely (discussed in Running a Shell Remotely). It can set variables and aliases, run programs, print your horoscope, or whatever you like.
This file is an example of a shell script: a file containing shell commands that can be executed as a unit. We’ll cover this feature in more detail in Programming with Shell Scripts.
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