View source for Interactive jobs on cluster

When using cluster it is important to know how to manage interactive jobs. We may want to know what all jobs are running, what all jobs a particular user is running and how to kill a particular job. The following bash commands are useful for the purpose: top, ps and kill.

===top===
<b>top </b> command is used to list the processes running on the system in real time. To exit from the top window press <b>q</b> . top command has several useful options.
* <b>top -u CRSid </b> is used to list the jobs of a particular user
* <b> top -n 1 -b > output </b> can be used to save the top window to a file
In top window itself
* pressing <b>z </b> highlights the running process
* pressing <b>c </b> shows absolute path of all running processes
* pressing <b>k </b> displays a line in top window where the process id (pid) of the process that needs to be killed can be directly entered and when asked about confirmation simply press <b>y </b> to kill the process.
* pressing <b>Shift+o </b> opens a new window with several options along with the corresponding letter that needs to be pressed to sort the top window based on a particular column. For example to sort all processes depending on memory usage i.e. %MEM press <b> shift+o, n </b> and <b> Enter </b>.
There is a lot more that can be done using top and more information can be found on its man page.

===ps===
ps stands for process status. One of its use can be to view the jobs of a particular user.
<pre> ps aux | egrep CRSid </pre>
The a, u and x in aux stand for displaying all processes along with usernames from which processes of a particular user can be extracted using egrep.

===kill===
kill can be used to kill a process. When running an interactive job, its execution can be stopped by pressing <b>Ctrl+z</b> and then kill command can be used.
<pre>
 kill signal pid 
</pre>
<b> kill -9 pid </b>can be used to kill the process immediately. The option -9 stands for SIGKILL. More information about different types of signals can be found here https://en.wikipedia.org/wiki/Signal_(IPC)#List_of_signals