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I have two files,

file1.txt:
1 abc
2 def
2 dgh
3 ijk
4 lmn

file2.txt
1 opq
2 rst
3 uvw

My desired output is:
1 abc opq
2 def rst
2 dgh rst
3 ijk uvw

Thanks everybody! It works perfectly.:D

Sorry for not making myself clear:
The actual names of the directories are:
"File Reader (#53)"
"CSV Writer (#47)"
"Scorer (#22)"

but to just make it simple we can rename them to:
"dir1...

I have the following string:
"File Reader"

I also have a list of directories:
"File Reader (#53)"
"CSV Writer (#47)"
"Scorer (#22)"

I want to search the name of each directory until I...

Instead of using ">>" try just using ">"
">>" adds to the file while ">" will overwrite.