Bash Cookbook: Use declare to scope variables in Bash

scope.sh

#!/bin/bash

# The declare builtin allows you to limit the scope of variables in bash

BAZ="OTHER"

foo ()
{
    declare BAZ="THIS"
    echo "Inside foo(), BAZ=${BAZ}"
}

bar ()
{
    declare BAZ="THAT"
    echo "Inside bar(), BAZ=${BAZ}"
}

echo "Outside of foo() and bar(), BAZ=${BAZ}"
foo
echo "Between calls to foo() and bar(), still BAZ=${BAZ}"
bar 
echo "Outside of foo() and bar(), still BAZ=${BAZ}"