Hi Hossein,
I need to read several (small) text files (all files in same dir)
look into using opendir to open your directory, then you can use readdir to get your files to read, using open.
However, one need ask; Is the ORDERing of your files contained in your directory important? If so, you might have to sort your file in a way to get the final content in the a correct order.
^* The content of all files are supose to go into one scalar $content
You can initialize a string say my $content = ""; then when you open and read through each of the files, chomping the newlines from each lines you can concatenate like so

...

while(my $line = <$fh>){
 chomp $line;  
 $content .= $line;
}
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