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@ -0,0 +1,12 @@ |
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#!/bin/bash |
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SIZE=${1:-12} |
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re='^[0-9]+$' |
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if ! [[ $SIZE =~ $re ]] ;then |
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echo "error: SIZE=$SIZE Not a number" >&2; exit 1 |
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fi |
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if [[ $SIZE -lt 4 || $SIZE -gt 20 ]]; then |
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echo "expected SIZE=$SIZE not in range [4..20]" >&2; exit 1 |
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fi |
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tr -cd '[:alnum:]' < /dev/urandom | fold -w $SIZE | head -n1 |