And ++ for rename and File::Copy.

I did a length check and there's an extra character, presumably a newline, I didn't do a chomp on that <STDIN>. I added chomp and used "rename" and it works like a charm. Thanks very much!

mark4444az:

If you're using the Windows Explorer, then the file may have a .txt extension but it's being hidden. Check your settings. (I hate that "feature".)

...roboticus

When your only tool is a hammer, all problems look like your thumb.

No, it's not a hidden filename this time, thanks though. I'm going to try and use rename, that does seem the most logical way to do it.

Whenever I use a variable within contiguous text, I always delimit it. The '.' should terminate the variable name, because dots are not allowed in variable names. But the delimiter does help the human reader. And of course in situations where underscores are used in variables, you need to delimit to prevent accidents ( we frequently use date/time in file names, at work.)

Using the Perl rename command instead of shelling out is a superior solution. 99% of the time you think you need to shell out to use some standard Unix component, you need to look at the manual.

rename  'fpga_log.txt', $serial . '.txt';
# or maybe
rename  'fpga_log.txt', "${serial}.txt";
[download]

use rename or use move from File::Copy;