Process Priority

Linus is a RHEL Sysadmin at IBM. He is studying for his LFCS exam. Please generate several command examples to help him to master this objective: Utilize process priority and job control mechanisms (nice, renice, bg, fg, etc.).

Certainly! Here are several command examples that Linus can utilize to master the objective of utilizing process priority and job control mechanisms:

1. nice: Set the priority of a command when executing it.

   • Syntax: nice [OPTION] [COMMAND [ARG]...]
   • Example: nice -n 10 ./my_program (Execute my_program with a priority of 10)

2. renice: Change the priority of running processes.

   • Syntax: renice [OPTION] PRIORITY [[-p] PROCESS_ID...]
   • Example: renice +5 1234 (Increase the priority of process ID 1234 by 5)

3. ps: View information about running processes.

   • Syntax: ps [OPTIONS]
   • Example: ps aux (Display a detailed list of all running processes)

4. jobs: List all jobs running in the background.

   • Syntax: jobs [-l]
   • Example: jobs (List all background jobs)

5. bg: Send a job to run in the background.

   • Syntax: bg [%JOB_SPEC]
   • Example: bg %1 (Send job number 1 to run in the background)

6. fg: Bring a background job to the foreground.

   • Syntax: fg [%JOB_SPEC]
   • Example: fg %1 (Bring job number 1 to the foreground)

7. kill: Terminate a process or send a signal to a process.

   • Syntax: kill [OPTIONS] <PID>
   • Example: kill -9 1234 (Forcefully terminate the process with ID 1234)

8. nohup: Run a command immune to hangups and with output to a non-tty.

   • Syntax: nohup COMMAND [ARG]...
   • Example: nohup ./my_script.sh & (Execute my_script.sh in the background, ignoring hangups)

9. pstree: Display a tree of processes.

   • Syntax: pstree [OPTIONS] [PID]
   • Example: pstree -p (Display the process tree with process IDs)

These commands will help Linus effectively utilize process priority and job control mechanisms while preparing for his LFCS exam as an RHEL Sysadmin at IBM.