filtering strings from text files

I'm tring to create a bash script that removes text entries from text file 1 that are in file 2 text 1 Code: abc def ghi text 2 Code: abc ghi my bash script so far Code: #!/bin/bash cd /home/pouar/test index=0 # read text 1 while read line ; do         a[$index]="$line"         index=$(($index+1)) done < ./1 index=0 # read text 2 while read line ; do         b[$index]="$line"         index=$(($index+1)) done < ./2 n=$((0)) m=$((0)) x=${#a[*]} while ((n<x)) do if [ "${a[$n]}"="${b[$m]}" ]; then #if string in text 1 is equal to string in text 2 n=$(($n+1)); #go to next line in text 1 m=$(($m+1)) #go to next line in text 2 else # or else echo "${a[(($n))]}" #print string n=$(($n+1)) #go to next line in text 1 fi done

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