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Example 5-4. Integer or string?
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#!/bin/bash # int-or-string.sh # Integer or string? a=2334 # Integer. let "a += 1" echo "a = $a " # Integer, still. echo b=${a/23/BB} # Transform into a string. echo "b = $b" # BB35 declare -i b # Declaring it an integer doesn't help. echo "b = $b" # BB35, still. let "b += 1" # BB35 + 1 = echo "b = $b" # 1 echo c=BB34 echo "c = $c" # BB34 d=${c/BB/23} # Transform into an integer. echo "d = $d" # 2334 let "d += 1" # 2334 + 1 = echo "d = $d" # 2335 # Variables in Bash are essentially untyped. exit 0 |