Lab Assignment $3-3$ Linux Processes Linux$+$ and LPIC$-1$

Special Instructions: If you are using COIS$-$Linux.austincc.edu to do this lab, you may get error messages when attempting some of these questions. Many of the command in Chapter $9$ require administrative $($root$)$ privileges and may not execute as expected. Another note: the output of the most of these commands is formatted in columns on the terminal screen and when moved to Word or a text editor the table loses its formatting. You need not try to correct it on your lab submission.

$1.$ Enter the command $$ps$$ and show the output.

$2.$ Enter the command $$ps $$f$$ and show the output.

$3.$ Run the command $$ps $$ef$$ and show the results. What process has the process id of $1?$ What is show in the TTY column of most processes? Which user started most of the processes?

$4.$ Run the command $$ps $$el$$ and show the results? What is the process state of most processes? What does a flag of $4$ mean? What is a nice value?

$5.$ Enter and run the command $$ps ax $|$ head $-11$ and show the output? What does the $$S$<$ mean when it appears in the STAT column.

$6.$ Enter the command $$kill $$l$$ and show the output? What is the SIGQUIT signal number? What is a SIGQUIT signal?

The remainder of the questions in this lab are optional. They require that you use a Linux system on which you have administrative $($root$)$ priviledges.

$7.$ Enter the command $$crontab $$e$$ and enter the following $($use the vim editor if asked to select$)$ then save and exit:

$304**5/$bin$/$ls $$l

$0141**/$bin$/$date

$8.$ Enter and run the command $$nice $$n $19$ ps $$l$$

$9.$ Enter and run the command $$at $10$:$15$ Oct $15$

When you get the at$>$ prompt enter:

at$>$ date $>/$root$/$atfile

at$>$ w $>>/$root$/$atfile

at$>$ Cntrl d

$10.$ Run the command $$crontab $$l$$ and show the results?