File: n.sh
   1 #!/bin/sh
   2 
   3 # The MIT License (MIT)
   4 #
   5 # Copyright (c) 2026 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 # n [options...] [start...] [files...]
  27 #
  28 # Number all lines starting at 1, or at the optional number given as the first
  29 # argument. In the output, leading line numbers and line contents are separated
  30 # by a tab.
  31 
  32 
  33 case "$1" in
  34     -h|--h|-help|--help)
  35         awk '/^# +n /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  36         exit 0
  37     ;;
  38 esac
  39 
  40 [ "$1" = '--' ] && shift
  41 
  42 if echo "$1" | grep -q '^[0-9][0-9]*$'; then
  43     start="$1"
  44     shift
  45 else
  46     start=1
  47 fi
  48 
  49 command='awk'
  50 if { [ -p /dev/stdout ] || [ -t 1 ]; } && [ -e /usr/bin/stdbuf ]; then
  51     command='stdbuf -oL awk'
  52 fi
  53 
  54 # show all non-existing files given
  55 failed=0
  56 for arg in "$@"; do
  57     if [ "${arg}" = "-" ]; then
  58         continue
  59     fi
  60     if [ ! -e "${arg}" ]; then
  61         printf "no file named \"%s\"\n" "${arg}" > /dev/stderr
  62         failed=1
  63     fi
  64 done
  65 
  66 if [ "${failed}" -gt 0 ]; then
  67     exit 2
  68 fi
  69 
  70 ${command} -v start="${start}" '
  71     BEGIN { n = start }
  72     { printf "%d\t%s\n", n++, $0 }
  73 ' "$@"