File: uawk.sh
   1 #!/bin/sh
   2 
   3 # The MIT License (MIT)
   4 #
   5 # Copyright © 2020-2025 pacman64
   6 #
   7 # Permission is hereby granted, free of charge, to any person obtaining a copy
   8 # of this software and associated documentation files (the “Software”), to deal
   9 # in the Software without restriction, including without limitation the rights
  10 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11 # copies of the Software, and to permit persons to whom the Software is
  12 # furnished to do so, subject to the following conditions:
  13 #
  14 # The above copyright notice and this permission notice shall be included in
  15 # all copies or substantial portions of the Software.
  16 #
  17 # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23 # SOFTWARE.
  24 
  25 
  26 # uawk [awk expression...] [filenames...]
  27 #
  28 #
  29 # Unique via AWK avoids lines duplicating the AWK expression given, by
  30 # emitting only the first line which gives the expression each of its
  31 # unique results.
  32 #
  33 # When not given any expression, whole lines are used: this effectively
  34 # makes it a line deduplicator which keeps lines in their original order,
  35 # unlike `uniq`, which requires sorted lines to avoid repetitions.
  36 
  37 
  38 case "$1" in
  39     -h|--h|-help|--help)
  40         awk '/^# +uawk /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  41         exit 0
  42     ;;
  43 esac
  44 
  45 [ "$1" = "--" ] && shift
  46 
  47 if [ -p 1 ] || [ -t 1 ]; then
  48     command="stdbuf -oL awk"
  49 else
  50     command="awk"
  51 fi
  52 
  53 code="${1:-\$0}"
  54 [ $# -gt 0 ] && shift
  55 ${command} '!c['"${code}"']++' "$@"