#!/bin/bash

processLine(){
  line="$@" # get all args
  traceroute -I -z 5 -w 2 $line
}
 
### Main script stars here ###
# Store file name
FILE=""
 
# Make sure we get file name as command line argument
if [ "$1" == "" ]; then
   echo "Usage: fqdn_traceroute.sh filename";
   exit 0;
else
   FILE="$1"
   # make sure file exist and readable
   if [ ! -f $FILE ]; then
        echo "$FILE : does not exists"
        exit 1
   elif [ ! -r $FILE ]; then
        echo "$FILE: can not read"
        exit 2
   fi
fi
# read $FILE using the file descriptors
 
# Set loop separator to end of line
BAKIFS=$IFS
IFS=$(echo -en "\n\b")
exec 3<&0
exec 0<"$FILE"
while read -r line
do
        # use $line variable to process line in processLine() function
        processLine $line
done
exec 0<&3
 
# restore $IFS which was used to determine what the field separators are
IFS=$BAKIFS
exit 0