Make “wget” persistent while downloading
You have used wget before. You have a remote hosted site, shell service, or file hosting. You can do ssh to your remote box. You decided to download a DVD image of your favorite distro to your remote box over ssh and decided to use wget. However, you are afraid that when you logout from your remote session, wget might terminate also. One nifty utility provides the bridge that you can cross from session termination, to perpetual session (at least until the intended result is achieved like when the download finishes).
Introducing “nohup”
“nohup” is this little jewel that came with virtually any Linux distribution and originally adopted from Unix’s own “nohup” version. The Linux incarnation of “nohup” was written by Jim Meyerling, licensed under the GPL and released by the FSF as part of the coreutils suite of tools.
“nohup” will run a command that you specify (not only wget) to be immune to hangups, logout, or even termination of session. As long as the server is alive and not rebooted, nohup will continue to execute the given command (or script).
Let my download finish!
On to the meat of this tip. wget is a great download tool however, it is not persistent and will terminate when you logout. Should you be downloading with wget via a remote terminal, this will pose a problem. “nohup” will make wget persistent and continue your download until such time that wget terminates, and nohup will then exit.
Using “nohup”
nohup <command string>
To run a “nohup” ’session’ with wget to have a persistent download, do:
nohup wget http://path.to.your.download.file
“nohup” will then append the standard output of “wget” into a file called nohup.out. Do remember also that “nohup” will not put the executed command into the background. To do so, modify the command above by appending “&” at the end of the command:
nohup wget http://path.to.your.download.file &
You can now log out of your remote box confident that your download will be finished by the time you log back in.
Happy downloading!
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