You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
14 lines
295 B
14 lines
295 B
#!/bin/bash
|
|
|
|
SIZE=${1:-12}
|
|
re='^[0-9]+$'
|
|
if ! [[ $SIZE =~ $re ]]; then
|
|
echo "error: SIZE=$SIZE Not a number" >&2
|
|
exit 1
|
|
fi
|
|
if [[ $SIZE -lt 4 || $SIZE -gt 20 ]]; then
|
|
echo "expected SIZE=$SIZE not in range [4..20]" >&2
|
|
exit 1
|
|
fi
|
|
|
|
tr -cd '[:alnum:]' </dev/urandom | fold -w "$SIZE" | head -n1
|