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Put them in exclude.txt and use grep -f -F.

for FILE in *.txt
do
sed 's/[^a-zA-Z \r\t]//g' "$FILE" |
tr -s ' \r\t' '\n' |
grep -v -F -f exclude.txt |...

I'd go about that in a slightly different way.

1) Strip out all non-alphanumeric and whitespace characters
2) Change all whitespace into newlines
3) Sort
4) uniq -c
5) Sort again to get the...

It means what it says. (( )) brackets are used for arithmetic expressions. If you want to do things like comparing strings, use [[ ]].

[[ ${a[$i]} != "frn2c" ]]

I get this. $ ./fator.sh 1 2 3 4
1 2 3 4
No of arguments: 4
length of array is: 4
k[0] = 1
a[0] =
k[1] = 2
a[1] = 2
k[2] = 3
a[2] =
k[3] = 4
a[3] =

$ What am I supposed to be seeing...