Question: $1.$ Find commands with patterns $1$a$.$ List all files$/$directories in the $/$etc$/$ directory that start with $$p$$ or $$q$.1$b$.$ List all files$/$directories in the $/$etc$/$ directory that start with $$p$$ or $$q$$ and must have a second letter as $$r$.1$c$.$ List all files$/$directories in the $/$etc$/$ directory that must start the line with $$se$$ and have the optional third letter

$1.$ Find commands with patterns

$1$a$.$ List all files$/$directories in the $/$etc$/$ directory that start with $$p$$ or $$q$.$

$1$b$.$ List all files$/$directories in the $/$etc$/$ directory that start with $$p$$ or $$q$$ and must have a second letter as $$r$.$

$1$c$.$ List all files$/$directories in the $/$etc$/$ directory that must start the line with $$se$$ and have the optional third letter of $$r$.$

$1$d$.$ List all files$/$directories in the $/$etc$/$ directory that use non$-$alphanumeric characters in their names.

$1$e$.$ Create an alias named lsor for the command you created in answer $($b$)$ and run lsor and then see if you get the same result as in $($b$)$

$1$f$.$ List all files$/$directories in the $/$etc$/$ directory that use digits in the name.

$1$g$.$ Modify the solution of $($f$)$ to show those files and directories that have digits and end in $$d$.$

$1$h$.$ List all files$/$directories in the $/$etc$/$ directory that have the text strings $($within the files$/$directories$)$cron$$ OR $$yum$$

Example formats that must be used:

ls $-$l $[$ab$]*$

ls $-$l $\{$b$*,$c$*,*$est$*\}$

ls $/$bin$/[!$a c$]*$

ls $/$bin$/[^$a$-$o$]$

ls $/$bin$/[^$a o$]$

Anything with $|$ grep$$ or not conforming to these formats is outside the scope of the lecture and would not be suitable for the assignment.