[Loki123]

nohup perl scipt.pl &

should put the script in background and keep it running after the SSH session is closed.

[t224]

Maybe perl script didnt end so you cant do anything.
Try to open new ssh from putty - one more, so you can connect and killall to close it for example.
Maybe it will be helpful

[Loki123]

Install screen (Not sure on your distro)

Once installed run

Code

$ screen

Run your script

Code

$ ./script.pl

then to exit Press Ctrl + a then d

this will detach screen from the session, returning you to your original prompt. To reattach run

Code

$ screen -r

Using screen for this purpose isn't the best way to do it. You can use pre installed tools such as, nohup, fg, bg instead.