iankelling.org Git - tee-unique/blob - teeu-function

   1 #!/bin/bash
   2 # Copyright (C) 2014 Ian Kelling
   3 # This program is under GPL v. 3 or later, see <http://www.gnu.org/licenses/>
   4
   5 teeu() {
   6     local help="Usage: appendu [-h|--help] FILE
   7
   8 Tee unique. Append each stdin line if it does not exist in the file.
   9
  10   [-h|--help]  display this message"
  11
  12
  13     if [[ $1 == --help || $1 == -h ]]; then
  14         echo "$help"
  15         return
  16     fi
  17
  18     if [[ ${#@} == 0 ]]; then
  19         echo "error: need 1 or more arguments"
  20         echo "$help"
  21         return 1
  22     fi
  23
  24     local MAPFILE
  25     mapfile -t
  26     for line in "${MAPFILE[@]}"; do
  27         grep -xFq "$line" "$1" &>/dev/null || tee -a "$1" <<<"$line"
  28     done
  29     return 0
  30 }