Filtering, Text Processing, and Compiling Programs

PART $1$: awk.

Open a new terminal window on your Linux system.

Type in ps and observe the output.

Type in ps $|$ awk $\text{'}\{$print$\}\text{'}$ and observe the output. It shouldn't impress you because it gave you the same output as the much shorter command in step $2$ above, with the addition of showing awk as a process.

Type in ps $|$ awk $\text{'}\{$print $$0\}\text{'}$ and observe the output. It should be the same as step $3$ above.

Now try this: ps $|$ awk $\text{'}\{$print $$1\}\text{'}$

Then this: ps $|$ awk $\text{'}\{$print $$2\}\text{'}$

Observe the output of steps $5$ and $6$ and try to determine what is going on with the output $($i$.$e$.$ what is awk doing?$).$

Take a screenshot of the commands and output of steps $2-7.$ Name it lab$\_7\_$screenshot$\_1.$

Type in man awk and review the manual page entry.

Type in clear.

Type in cat $/$etc$/$shells and observe the output.

Type in awk $-$F $"/"\text{'}/^\backslash //\{$print $NF$\}\text{'}/$etc$/$shells and observe the output and compare it to the output of step $11$ above.

Type in awk $-$F $"/"\text{'}/^\backslash //\{$print $NF$\}\text{'}/$etc$/$shells $|$ sort $-$u and observe the output and compare it to the output of step $12$ above.

Take a screenshot of the commands and output of steps $11-13.$ Name it lab$\_7\_$screenshot$\_2.$