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g Add the PPID column to the display by pressing , then press You should now see the PPID of each process added to the display h Exit top by pressing 6 Practice using the ps utility to view processes by doing the following:
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a At the shell prompt, enter ps What processes are associated with the current shell session b View all running processes on the system by entering ps ef |more at the shell prompt c Press until you find the atd service What user name does atd run under (On most distributions, it should run under the at user) d At the shell prompt, enter ps el |less e Locate the Status (S) column f Press until you find the atd service What is the status of the service (Because it isn t being used at the moment, it s probably sleeping) 7 Practice managing process priorities by completing the following: a At the shell prompt, enter top b What are the priority (PR) and nice (NI) values associated with the top processes (For most distributions, these values should be 16 and 0)
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d At the shell prompt, enter nice n 20 top Now what are the PR and NI values for the top process e Note the PID for the top process f Open a new terminal window and su to root g At the shell prompt, adjust the nice value of the top process while it s running by entering renice 1 top_PID h Switch back to the first terminal session where top is running What are its PR and NI values now 8 Practice switching processes between the foreground and the background by doing the following: a Load top again by entering top at the shell prompt c Note the background job ID number assigned to the process d At the shell prompt, enter bg background_job_ID The output from top disappears while the process runs in the background f At the shell prompt, enter fg background_job_ID The output from top reappears as the process now runs in the foreground 9 Practice killing processes by completing the following: a Ensure that top is still running b Switch to your other terminal session where you re logged in as root c At the shell prompt, enter ps e |grep top d Note the PID of the top process e At the shell prompt, enter kill SIGTERM top_PID f Switch back to the terminal session where top was running Verify that top has exited g Load top again at the shell prompt h Switch back to your other terminal session where you re logged in as root i Kill the top process by entering killall 15 top j Switch back to your first terminal window and verify that top has exited
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b In the terminal where top is running, press
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c Press
to stop the top process
to exit top
10: Managing Linux Processes and Services
It s time to make a quantum leap and change topics! We next need to discuss how to schedule processes on your Linux system
CERTIFICATION OBJECTIVE 1003
Schedule Processes
So far in this chapter, you ve learned how to execute and manage processes on a Linux system from the shell prompt However, there will be many occasions when you will need a process to run automatically without any intervention on your part Backups are a good example One of the key problems with backups is not that system administrators perform them incorrectly; it s that they forget to perform them at all One of the worst things you can do in your backup strategy is to rely on a human being to remember to run them Instead, you can configure your Linux system to run programs for you automatically This removes the human element from the equation and ensures that the specified programs execute regularly and on time There are two key utilities that can be used to schedule processes to run in the future We ll discuss the following in this part of the chapter:
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