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  3. Introduction to Shell

Exercise

How does the shell store information?

Like other programs, the shell stores information in variables. Some of these, called environment variables, are available all the time. Environment variables' names are conventionally written in upper case, and a few of the more commonly-used ones are shown below.

Variable Purpose Value
HOME User's home directory /home/repl
PWD Present working directory Same as pwd command
SHELL Which shell program is being used /bin/bash
USER User's ID repl

To get a complete list (which is quite long), you can type set in the shell.

Use set and grep with a pipe to display the value of HISTFILESIZE, which determines how many old commands are stored in your command history. What is its value?

Instructions

50 XP

Possible answers