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In Chapter 14, “Working with Processes and Jobs,” you'll see how to use the ps command to view the processes currently running on the Linux system. You can use it now to take a quick peek at what programs are currently running on your Linux system.

1 Log into your Linux system. (If you don't have a Linux system available yet, you can come back to here after going through either Chapter 2 or Chapter 4.)

2 At the command prompt, enter the command psax. You should see something similar to this output:$ ps ax PID TTY STAT TIME COMMAND 1 ? Ss 0:00 /sbin/init maybe-ubiquity 2 ? S 0:00 [kthreadd] 3 ? I< 0:00 [rcu_gp] 4 ? I< 0:00 [rcu_par_gp] 5 ? I 0:00 [kworker/0:0-memcg_kmem_cache] 6 ? I< 0:00 [kworker/0:0H-kblockd] 7 ? I 0:00 [kworker/0:1-events] 8 ? I 0:00 [kworker/u2:0-events_power_efficient] . . . 1033 tty1 S 0:00 -bash 1054 tty1 R+ 0:00 ps ax $We've just shown the start of the listing, along with the last two lines, but you should see a long list of different programs running on your Linux system (including the ps command that you started). The kernel is keeping track of all those programs!