Example 5-4. Integer or string?
#!/bin/bash
# int-or-string.sh
# Integer or string?
a=2334 # Integer.
let "a += 1"
echo "a = $a " # Integer, still.
echo
b=${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 |
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