8bd4c7253b
Outputs cryptographically random strings using only characters safe for unquoted use in bash, YAML, and JSON: [A-Za-z0-9._+\-:@^~] Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
64 lines
1.2 KiB
Bash
Executable File
64 lines
1.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -uo pipefail
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CHARSET='A-Za-z0-9._+\-:@^~'
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DEFAULT_LENGTH=32
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usage() {
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cat <<'EOF'
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Usage: gen-secret [OPTIONS] [LENGTH]
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Generate a cryptographically random string safe for bash, YAML, and JSON.
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Arguments:
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LENGTH Number of characters (default: 32)
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Options:
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-n, --dryrun Preview what would happen
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-h, --help Show this help
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EOF
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}
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dryrun=false
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length=""
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while [[ $# -gt 0 ]]; do
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case "$1" in
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-h|--help)
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usage
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exit 0
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;;
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-n|--dryrun)
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dryrun=true
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shift
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;;
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-*)
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echo "Error: Unknown option: $1" >&2
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exit 1
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;;
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*)
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if [[ -n "$length" ]]; then
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echo "Error: Too many arguments" >&2
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exit 1
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fi
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length="$1"
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shift
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;;
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esac
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done
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length="${length:-$DEFAULT_LENGTH}"
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if ! [[ "$length" =~ ^[0-9]+$ ]] || [[ "$length" -le 0 ]]; then
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echo "Error: Length must be a positive integer" >&2
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exit 1
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fi
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if $dryrun; then
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echo "[dryrun] Would generate a ${length}-character secret from charset: [${CHARSET}]"
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exit 0
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fi
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tr -dc "$CHARSET" < /dev/urandom | head -c "$length"
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echo
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