It seems to be simple, but I cannot find an way to do that. I have several tab-delimited files in one folder. I want to merge them into one file, and add a new column for file name.

For example, input files are:
file "A.tab": 


XXX XXX XXX
XXX XXX XXX

[download]
file "B.tab": 
XXX XXX XXX
XXX XXX XXX

[download]
expected output: 
A.tab XXX XXX XXX
A.tab XXX XXX XXX
B.tab XXX XXX XXX
B.tab XXX XXX XXX

[download]

I firstly tried to use something like this: 

for file in `ls my_input_dir`; do perl -n -E 'print "$ARGV[0]\t$_"' my
+_input_dir/$file; done

[download]
but it won't work, as the file name is not got in $ARGV...

In reply to How to do this with shell scripting and perl one-line? by llancet

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