for i in `cat file_2.txt`; 
do 
echo $i|grep -v -f file_1.txt; 
done > file_output.txt

# sort file_1.txt > f1.txt

# sort file_2.txt > f2.txt

# comm -13  f1.txt f2.txt > fileout.txt

# nano fileout.txt

# sort file_1.txt > fa.txt ; sort file_2.txt > fb.txt ; comm -13  fa.txt fb.txt > out.txt ; nano out.txt

#The while loop will go through each line in the file "$secFile"
while read line ; do
	
	#In my files, I am looking for any line that contains 2241 with anything after it (till the end of the word)
        output=`echo $line | grep -o "2241\w*"`
        #If the string is not null, it will store it in the array, and add one onto the counter 

        if [[ -n "$output" ]]
        then
                myarray[$i]=$output
                #i is keeping track of the number of $output stored into the array i=`expr $i + 1`
                i=`expr $i + 1`
        fi
        count=`expr $count + 1`
#Give the while loop the secFile
done < $secFile

#This while loop goes through the lines of $firtFile, and check them against the newly created array.
while read line ; do
	#match is to see if the line and the array match.  If they do, it will trigger match to equal 1, and not do anything with that line. 
        #If it does not match, it will echo the line into a new file.
        match=0
        compare=`echo "$line" | grep -o "02241\w*"`

	#If $compare is not null, then it will continue into the if statement.
        if [ -n "$compare" ]
        then
        	#Looping through myarray, this gets the number of entries in the array ( ${#myarray[@]} ) and will only execute the loop till that number is met.
                for (( x=0 ; x < ${#myarray[@]} ; x++ )) do
			#If the entry in myarray matches $compare or matches with a 0 infront of the array, it will change match to 1.
                        if [ "${myarray[$x]}" == "$compare" ] || [ "0${myarray[$x]}" == "$compare" ]
                        then
                                match=1
                        fi

                done

        fi

if [ $match = 0 ]
then
	#You can put the new file wherever you like, I have just put an example here that the script will write to the file: newfile.txt in the directory: missedLines.
        echo "$line" >> "/missedLines/newfile.txt"
fi

done < "$firstFile"