#!/bin/bash
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set -e
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if [ -z "$1" ]; then
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source_list=/dev/stdin
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dest_list=/dev/stdout
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else
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source_list="$1"
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dest_list="$1"
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fi
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# Load the file
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readarray A < "$source_list"
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# Sort
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IFS=$'\n'
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# Stash away comments
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C=( $(grep -E '^#' <<< "${A[*]}" || :) )
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A=( $(grep -v -E '^#' <<< "${A[*]}" || :) )
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# Sort entries
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A=( $(LC_COLLATE=C sort -f <<< "${A[*]}") )
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A=( $(uniq <<< "${A[*]}") )
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# Concatenate comments and entries
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A=( ${C[*]} ${A[*]} )
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unset IFS
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# Dump array back into the file
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if [ ${#A[@]} -ne 0 ]; then
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printf '%s\n' "${A[@]}" > "$dest_list"
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fi
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