15 lines
295 B
Bash
Executable File
15 lines
295 B
Bash
Executable File
#!/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
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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
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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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