PowerPoint Presentation

„Shell Variables

_shell variables are variables that are stored in, and affect the shell

_all variables are stored as strings (or as arrays of strings)

_a variable is accessed via the '$' character

_the 'echo' command: echo the line after processing any special characters

"command: echo my home dir, $HOME, holds ~/*

_the 'set' command: set or assign values to one or more variables

"without arguments: 'set' displays all variables, along with any values

"'set' takes a list of variables to set, possibly with values

"consider the commands:

set food

echo $food

set food = pickle

echo $food

echo $pickle

set eat food = chocolate donut

set

set food = "eat chocolate donut"

echo $food