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47 lines
1.2 KiB
Bash
47 lines
1.2 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: 2020-08-15 12:55:07 +0100 (Sat, 15 Aug 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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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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# shellcheck disable=SC1090,SC1091
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. "$srcdir/lib/utils.sh"
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# shellcheck disable=SC2034,SC2154
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usage_description="
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For each line passed in via standard input, checks the given file argument and appends each line that doesn't already exist within the file
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This is re-evaluated for each line, so acts as a 'uniq' filter for input lines too
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See vagrant/provision.sh for an example of this in use
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"
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# used by usage() in lib/utils.sh
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# shellcheck disable=SC2034
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usage_args="<filename>"
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help_usage "$@"
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min_args 1 "$@"
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filename="$1"
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while read -r line; do
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# if file doesn't exist will append to create it
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grep -Fxq "$line" "$filename" 2>/dev/null ||
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echo "$line" >> "$filename"
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done
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