Example 5-4. Integer or string?

#!/bin/bash# int-or-string.sh# Integer or string?a=2334 # Integer.let "a += 1"echo "a = $a " # Integer, still.echob=${a/23/BB} # Transform into a string.echo "b = $b" # BB35declare -i b # Declaring it an integer doesn't help.echo "b = $b" # BB35, still.let "b += 1" # BB35 + 1 =echo "b = $b" # 1echoc=BB34echo "c = $c" # BB34d=${c/BB/23} # Transform into an integer.echo "d = $d" # 2334let "d += 1" # 2334 + 1 =echo "d = $d" # 2335# Variables in Bash are essentially untyped.exit 0

[@more@]