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 buffered=0
  34 
  35 case "$1" in
  36     -b|--b|-buffered|--buffered)
  37         buffered=1
  38         shift
  39     ;;
  40 
  41     -h|--h|-help|--help)
  42         awk '/^# +n /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  43         exit 0
  44     ;;
  45 esac
  46 
  47 if echo "$1" | grep -q '^[0-9][0-9]*$'; then
  48     start="$1"
  49     shift
  50 else
  51     start=1
  52 fi
  53 
  54 [ "$1" = '--' ] && shift
  55 
  56 # show all non-existing files given
  57 failed=0
  58 for arg in "$@"; do
  59     if [ "${arg}" = "-" ]; then
  60         continue
  61     fi
  62     if [ ! -e "${arg}" ]; then
  63         printf "no file named \"%s\"\n" "${arg}" >&2
  64         failed=1
  65     fi
  66 done
  67 
  68 if [ "${failed}" -gt 0 ]; then
  69     exit 2
  70 fi
  71 
  72 flush=0
  73 if [ "${buffered}" -eq 0 ] && { [ -p /dev/stdout ] || [ -t 1 ]; }; then
  74     flush=1
  75 fi
  76 
  77 awk -v flush="${flush}" -v start="${start}" '
  78     BEGIN { n = start }
  79     { printf "%d\t%s\n", n++, $0; if (flush) fflush() }
  80 ' "$@"