Editing Scanco Administration (section)

=====Keeping a job running after you log out=====

Use nohup. For example, suppose you want to run <tt>./myjob 20</tt>. In this case, you could use:

 nohup nice ./myjob 20 &> output &

There are several things to note here:

* The <tt>&</tt> at the end of the command line is there so you get the command prompt back immediately (see the previous section).
* We have redirected the output to a file out_file with <tt>&> output</tt>. If you don't do this, any output to STDIN (normally the console) will automatically go into a file called <tt>nohup.out</tt>.
* We've niced the job to reduce it's execution priority. This is courteous if you're a multiuser system. 

If you want to see what's in nohup.out (or whatever you called it) at any time, you can do the usual

 cat nohup.out

Here's another potentially more useful command:

 tail -f nohup.out

tail shows you the last few lines of the files. In addition, the -f flag ("follow") means that as lines get added to the file, they are displayed on the screen. This looks just like when you run the program without nohup, except when you hit CTRL-C, the program keeps on running in the background.


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