Shell Programming and Scripting

I have a file MAT.txt which contains the following data:
mat1.txt
mat2.txt
.
.
.
.
mat100.txt

I want to remove the '.txt' from every line and have an output file with the following data:
mat1
mat2
.
.
.
.
mat100

I know this can be done with sed easily for each line, but I do not know how to use sed in a loop and have a script that does the editing from line 1 to line 100.

The following code works, but I need it in a loop:

sed -e '/mat1.txt/s//mat1/g' -e '/mat2.txt/s//mat2/g' ............... -e '/mat100.txt/s//mat100/g' MAT.txt > MAT1.txt

Can somebody help me out?

You don't need any loop.

Code:

sed 's/\.txt$//' MAT.txt > MAT1.txt

Thanks jlliare. I ran the code you provided but the .txt extension still remains.

Check whether MAT.txt has any space or non-printable char at the end of each line

Code:

cat -vet MAT.txt

Sorry, i should be more specific with describing MAT.txt.
It has 3 columns:
mat1.txt 548726 A
mat1.txt 125484 B
mat1.txt 568543 A
mat1.txt 885647 B
.
.
.
.
.
mat100.txt 898468 A

The result should look like:
mat1 548726 A
mat1 125484 B
mat1 568543 A
mat1 885647 B
.
.
.
.
.
mat100 898468 A

Remove $ from jlliagre's code to remove .txt anywhere in the line instead of end of the file

Code:

sed 's/\.txt//' MAT.txt > MAT1.txt

Yes, it worked this time. Thanks a million anbu23!