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36 lines
1.0 KiB
Bash
36 lines
1.0 KiB
Bash
#!/usr/bin/env bash
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# vim:ts=4:sts=4:sw=4:et
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#
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# Author: Hari Sekhon
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# Date: 2020-06-24 00:45:44 +0100 (Wed, 24 Jun 2020)
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#
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# https://github.com/HariSekhon/DevOps-Bash-tools
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#
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# License: see accompanying Hari Sekhon LICENSE file
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#
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# If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
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#
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# https://www.linkedin.com/in/HariSekhon
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#
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# Generates a random alphanumeric string of the given length
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#
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# pwgen is also a good option, but may not always be installed, hence this is more portable
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set -euo pipefail
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[ -n "${DEBUG:-}" ] && set -x
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#srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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len="${1:-32}"
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if ! [[ "$len" =~ ^[[:digit:]]+$ ]]; then
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echo "invalid string len given as first argument to ${0##*/}" >&2
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exit 1
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fi
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# fixes illegal byte error in tr / sed etc
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export LC_ALL=C
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#tr -duc 'A-Za-z0-9' < /dev/urandom | fold -w "$len" | head -n1
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tr -duc '[:alnum:]' < /dev/urandom | head -c "$len" || : # head returns error code 141 but succeeds
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