30 Linux Questions added - check for any repeated ones, if any remove.

[gideongandu]

To mount a drive by its ID, what command would you use first to retrieve it? •
df -h •
listid •
ls -l •
blkid

Linux file access control lists (ACLs) are _____. •
discretionary access control system permissions layered over standard Linux permissions •
mandatory access control system permissions layered over standard Linux permissions a type of firewall for Linux •
the same as standard Linux permissions  

When using iproute2, how do you show routing information for an IPv6 network? •
route -ipv6 •
route •
ip -6 route show •
ip route show

What does this command string do? find / -size +10M -exec ls -l {} \; •
It finds all files using ls -l and hands them off to the find command to display. •
It finds all files older than 10 minutes and long lists them using the ls command. •
It finds all files larger than 10 MB and long lists them using the ls command. •
It uses the ls command to find all files in the filesystem matching the {} wildcard.   What would this locate command show? locate --regexp '^/usr.pixmaps.jpg$' •
all files in a directory named pixmaps •
all files ending in ".jpg"all files ending in ".jpg" •
all file paths that start with "/usr", include the word "pixmaps", and end with ".jpg" •
all file paths that include "/usr/pixmaps" and end with ".jpg"

Which command allows you to do packet analysis from the command line? •
wireshark •
ethtool •
netstat •
tcpdump   Which command will tell you how long a system has been running? •
log •
uptime •
runtime •
access

How would you describe PCP (Performance Co-Pilot)? •
It is an application testing suite used to profile programming code. •
It is a local command used for monitoring local system resources in real time. •
It is a set of tools, services, and libraries for gathering and analyzing performance measures. •
It is a tool designed to change system configuration for purposes of optimization.   You want to resolve a long list of DNS names using dig. What should you do? •
Create a text file including all names and use the -f option of dig. •
Type in each query manually. •
Write a shell script to send multiple dig queries to the DNS server. •
Save the DNS names in an SQL database and process it with dig.

What would this command output? ps -e --format uid,pid,ppid,%cpu,cmd •
the user ID, process ID, parent process ID, CPU usage, and command name of a process •
the user ID, group ID, parent process ID, CPU usage, and command name of a process •
the UUID, process ID, parent process ID, CPU usage, and command name of a process •
all of these answers   Which command in Bash executes the last line in the shell history that starts with ls? •
! •
!! •
!* •
!ls

The ssh-copy-id command copies _____ to the remote host. •
both private and public keys •
the ssh public key •
the ssh private key •
a fingerprint file   What command is used to determine the amount of disk usage for a directory? •
find •
fdisk •
du •
df

A backup drive was created using dd to make a bit-for-bit copy. When the drive is inserted into an iSCSI target before it is booted up, the data appears to be missing. What happened? •
The backup drive is corrupted and needs to be re-created. •
When the backup drive was duplicated, the label was as well. When booted, the system mounted the old duplicated drive by its identical label. •
There is a conflict between the physical location of the backup drive and the original drive. •
The backup process went wrong, and the old drive was duplicated over the original drive.   What is the key difference between a redirect (>) and piping to the tee command? •
The tee command sends output only to STDOUT and STDERR. •
A redirect sends output to STDOUT and a file, whereas a tee sends output only to STDOUT. •
Nothing, they are the same. •
The tee command sends output to STDOUT and a file, whereas a redirect sends output only to a file.

What does the /etc/nsswitch.conf file manage? •
priority of one DNS server over another •
per network interface DNS server configuration •
alternative DNS services •
sources for name service information   Assume the variable myNumber holds a string consisting of 10 digits. What will this command output? echo $myNumber | sed -e 's/^[[:digit:]][[:digit:]][[:digit:]]/(&)/g' •
It will only match digits—and since the string has only digits, the command will output the same number without changes. •
It will output the same 10-digit number, but every digit will be inside parentheses. •
It will output the entire 10-digit number inside parentheses. •
It will output the same 10-digit number, but the first 3 digits will be inside parentheses.

Packages can be downloaded but not installed with yum or dnf by specifying which option? •
None of these answers. yum does not support downloading packages without installing them. •
--downloaddir •
-d •
--downloadonly   What character class is equal to this set? [0-9] •
[[:alnum:]] •
[[:digit:]] •
[[:alpha:]] •
[[:num:]]

When archiving files, which command will preserve all file attributes including ACLs and SELinux security context? •
zip •
tar •
archive •
gzip

  In a systemd-based OS, you can change the system hostname by editing /etc/hostname manually and then doing what? •
Restart dhcpd. •
Run /etc/hostname. •
Nothing, the system notices automatically. •
Notify systemd to update it by restarting the systemd-hostnamed service.

What command would you use to resize an LVM volume group to include an additional physical volume? •
vgadd •
vgresize •
vgappend •
vgextend   When would this system cron job run its task? 0 1 * •
every minute of the hour •
every hour of every day •
every day at 1:00 AM •
only on Mondays

ifconfig has been deprecated. What command is now recommended for changing IP addresses in the live config? •
netconf •
ipconfig •
ipman •
ip   You are managing an Apache web server on a system using SELinux. By default it cannot read personal webpages in users' home directories. What SELinux boolean would you set to allow this? •
apache_enable_homedirs •
httpd_enable_userdirs •
httpd_enable_homedirs •
httpd_enable_userhome_dirs

Why doesn't passwd -l keep a user from logging in via other methods? •
The passwd command is not used for locking passwords. •
There is no password -l option. •
It locks only the password, not the account, so users can still authenticate with keys or other methods. •
It does lock the account, keeping users from logging in even if they are using other authentication methods.

  In the Bash shell, what is the difference between piping into | and piping into |&? •
Piping into | pipes both stdout and stderr. Piping into |& pipes only stderr. •
Piping into | pipes stdout. Piping into |& pipes stdout and stderr. •
Piping into | pipes both stdout and stderr. Piping into |& pipes only stdout. •
Piping into | pipes stdout. Piping into |& pipes all open file descriptors.

Why is the passwd command able to modify the /etc/passwd file? •
The kernel identifies it as one of the names of extended commands. •
It has the same name as the file it modifies. •
It has the SUID permission mode and is owned by root. •
It is a system administration command.

  When a user deletes a file using the rm command, Linux will _____. •
always ask for confirmation •
back up the file before it deletes the file •
ask for confirmation if configured to do so •
never ask for confirmation

What is a major advantage of using Logical Volume Management (LVM)? •
Access to a drive is faster than with standard partitions. •
Volumes can be resized smaller without unmounting them. •
Repairing filesystem errors is easier than with standard partitions. •
Volumes can be resized even if the free space is not contiguous.

[github-actions[bot]]

Hello @gideongandu , thank you for submitting an issue! 👍 We highly appreciate it if you work on it as well.

[Ebazhanov]

@gideongandu thank you for raising this issue :+1: we verified your suggestion and added missed questions so you can find them here https://github.com/Ebazhanov/linkedin-skill-assessments-quizzes/blob/master/linux/linux-assesment.md and @rradfar thank for taking care of this issue! :fire: