Dear Era,
I want the script should take the input file as a variable as well as output file. I have two text files: (1) List of folders in which the script should work (2) List of input files on which the script should work.
Due to lack of Perl knowledge I tried unsuccessful. In Shell script I use:

for i in `(cat countries.txt)`
do

for j in `(cat year.txt)`

do

for k in `(cat countries/$i/$j)`

do



Same way I want the perl script take the inputfile as variable

Thanks