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Yes I need output with rows from both files with similar first column
I am using awk but if I right if statement it gives me no output at all
after this statement {a[$1]=$0;next} if doesnt see this...

I sorted files and then used join -1 1 -2 1 file1 fil2 but it gives me zero output
I tried the following code:
nawk -F\t 'NR==FNR{a[$1]=$0;next} ($1 in a) 'file1 file2

it works almost well,but...

Thanks for your reply!
I tried to use awk,but it still doesnt give me any output ,but these files definitely have compatible rows.
Could you please describe me how can I use join command?

I was thinking about this ,but will it be working if I have different amount of rows in files?

I searched a lot considering this theme,but still cant make my code working.
I have two tab separated files, I want to do the following thing:

File 1:

xx1 y yy
xx2 y yy
xx3 y yy
xx4 y yy...