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