23 lines
481 B
Bash
23 lines
481 B
Bash
function middle3digits
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{
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typeset -i n="${1#-}"
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typeset -i l=${#n}
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if (( l < 3 )); then
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echo >&2 "$1 has less than 3 digits"
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return 1
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elif (( l % 2 == 0 )); then
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echo >&2 "$1 has an even number of digits"
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return 1
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else
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echo ${n:$((l/2-1)):3}
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return 0
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fi
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}
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# test
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testdata=(123 12345 1234567 987654321 10001 -10001 -123 -100 100 -12345 1 2 -1
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-10 2002 -2002 0)
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for n in ${testdata[@]}; do
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printf "%10d: " $n
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middle3digits "$n"
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done
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