delete-space-from-file.sh

#auther peyman soleymani
#date 1/sep/2019
#!/bin/bash

#./space.sh [file-path] [-f | --fix] [-h | --help]

function usage() {

    echo "USAGE: $0 [file-path] [-f | --fix] [-h | --help]"

    exit 1
}

FIX=0   #0-do not perform fix   1-perform fix
if [ $# -eq 0 ]; then
    usage
fi 

while [ $# -gt 0 ]
do
   case "$1" in
     -f|--fix )
      FIX=1
      shift
         ;;

     -h|--help )

       usage

       shift
          ;;



          * )

          if [ -f "$1" ]; then

          FILE="$1"
              shift
            else
              usage
            fi 
            ;;
   esac
done
if [ $FIX -eq 1 ] && [ -f "$FILE" ]; then
    echo "fixing space and tab at the beginning and at the end of line"
    sed -i 's/[[:blank:]\+$]//' "$FILE"
    sed -i 's/^[[:blank:]]\+//' "$FILE"
    echo "DONE"
fi 


#display graghicaly space error
if [ -f "$FILE" ]; then
    while IFS= read -r line
    do
      #if there is no space issue on a line, just prinr the line
      echo "$line" | sed -e '/[[:blank:]]\+$/q9' -e '/^[[:blank:]]\+/q7' >/dev/null
      if [ $? -eq 0 ]; then
        echo "$line"
        continue
      fi   
     done < "$FILE"

fi

delete space and tab from start and end of line to file