bash scripts(3)

#!/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