IS$264$: UNIX$/$Linux II

Homework $1$: Command Line Review $(50$ points$)2024$

$1.$ Write a command to display the contents of your current directory; the listing should show the permissions

on each entry and should include any $$hidden$$ files in the directory:

$2.$ Write the command to move to the etc directory, which is inside the root directory; use an absolute path in

your answer:

$3.$ What command could you issue to create a new system group called $$jdoegroup$$ on your system:

$4.$ What command could you use to install the lynx program on your fedora $($red hat$)$ system, assuming you

had not yet downloaded any package files needed for the application:

$5.$ Assume a file called $$newdata$$ is in the $/$home directory while you are currently in the $/$home$/$myname

directory. Using relative paths, write a single command to copy the file newdata to your current directory:

$6.$ Write the command to display the contents of a file in your current directory called $$notes$$ so that you have

forward and backward page control and the display shows line numbers on each line:

$7.$ Write a command to display only the $22$nd line of the $$notes$$ file $($which is in your current directory$)$:

$8.$ Assume there is a file called $$errorlog$$ in the $/$root directory $($i$.$e$.,$ a directory called $$root$$ inside the actual

system root directory$)$ and you wish to display the contents, but do not have permission to read the file. You

are, however, a member of the admin group. Write a command to display the file $($while logged in as your

current user$)$:

$9.$ You wish to set the permissions on a file called prog$1$ in your current directory to: $-$rwxr$-$x$-$wx$.$ Write the

chmod command to do this using $$octal$$ syntax:

$10.$ Assuming you have separate files called: file$1,$ program$2,$ and scriptC in your current directory, write a

single command to put copies of each of these files in the directory: allfiles which is a subdirectory of the

root directory $($you have required permissions$)$:

$11.$ Assume you have two files called PartA and PartB in your current directory, and you wish to combine these

files $$vertically$($one after the other without a break$)$ into a file called PartBA such that the contents of file

PartB appear first followed by the contents of file PartA. Write the command for this:

$12.$ After logon$,$ what command do you issue to change to the system admin user $($root user$)$:

$13.$ A file called $$actionlog$$ is in the $/$boot directory $($you are in your home directory$)$ and you wish to display all

lines from that file which have the word $$linux$$ in them; write the command to do this without changing

directories:

$14.$ Write the command $($for systemd systems like Fedora and Red Hat$)$ that will check whether the SELinux

security process is running in $$enforcing$$ or $$permissive$$ mode:

$15.$ You wish to add the contents of file notes $($in your current directory$)$ to the file allnotes $($also in your current

directory. Write a command to perform this using redirection of output:

$16.$ Write a single command to create a new directory tree called $$mystuff$/$archive$/$progs$$ which is to be a

subdirectory of your current directory $($none of the new directories exist$)$:

$17.$ Write the command to create a new user calls IS$264$User and make that user a member of the IS$264$ group

$($which already exists$)$:

$18.$ After running top in the background, you now type $$ps$$ and receive the following result:

PID TTY TIME CMD

$13698$ pts$/300$:$00$:$00$ bash

$13742$ pts$/300$:$00$:$00$ top

$13744$ pts$/300$:$00$:$00$ ps

Write the command to terminate the top process $($make sure it will terminate, regardless of system status$)$:

$19.$ Assume that you wish to delete the directory called $$garbage$$ and all its subdirectories, and that $$garbage$$ is

a subdirectory of your current directory, but you do not know if garbage has any other files in it$.$ Write

single command to accomplish this:

$20.$ Assume that you attempt to execute a script called ShowStats but receive the message $$permission denied.$$

Write an alternate command that should work without actually changing permissions on the file $($assume

you have read permission on the file$)$:

$21.$ After logon$,$ write the command to check the status of a service called $$carpald$$ is running and active on

your system:

$22.$ Write the systemd command to check whether the firewall process is loaded and active:

$23.$ Write a command to display the available network interfaces on your machine including the current MAC

and IP addresses:

$24.$ Using relative paths, type the command to copy the file $$somethingnew$$ which is in your current directory

into your parent directory changing the name to $$somethingold$.$ After the operation the file somethingnew

should no longer exist in your current directory. Also, the command should warn you if you are about to

overwrite an existing file

$25.$ Write the $($combined$)$ command such that script $$adddata$$ will run only if the script $$datacheck$$ runs

successfully before trying to run adddata: