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12 lines
294 B
12 lines
294 B
#!/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
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