If you run wget and close the terminal or terminate your ssh session , it will terminate the wget process too. You need to run wget and keep it running even after the session is closed.
For that purpose there are many tools.
wget -bqc http://path-to-url/linux.iso
You will see a PID on screen:
Continuing in background, pid 12345.
-b : Go to background immediately after startup. If no output file is specified via the -o, output is redirected to wget-log.
-q : Turn off Wget’s output aka save disk space.
-c : Resume broken download i.e. continue getting a partially-downloaded file. This is useful when you want to finish up a download started by a previous instance of Wget, or by another program.
The nohup command
You can also use the nohup command to execute commands after you exit from a shell prompt. The syntax is:
$ nohup wget -qc http://path-to-url/linux.iso &
## exit from shell or close the terminal ##
The disown bash command
Another option is to use the disown command as follows:
$ wget -qc http://path-to-url/linux.iso &
$ disown wget
PID TTY TIME CMD
10685 pts/0 00:00:00 wget
10687 pts/0 00:00:00 bash
10708 pts/0 00:00:00 ps
The screen command
You can also use the screen command for this purpose.