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Hi,
I have two files. File1.txt has 2 columns and looks like:
458739 122345
4456 122657
34200 122600

File2.txt has many columns with column 1 the same as column2 of File1.txt, but...

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

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
....

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

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:...