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A hard drive containing the entire filesystem of an offline machine was removed and attached to a working machine as a secondary drive. Assuming its mount point is /mnt/hd, how would journalctl be used to inspect the contents of the journal files located at /mnt/hd/var/log/journal/?
How can a system reboot scheduled with the shutdown command be canceled?
From a GRUB Legacy shell, what are the commands to install GRUB to the first partition of the second disk?
Use objdump with the -p (or –private-headers) option and grep to print the dependencies of Bash:
Using apt-cache, what is the command to show information for the package gimp?
How can you use zypper to check if the package unzip is installed?
Using yum, find out which package provides the file /bin/wget.
A mission-critical server installation that will require the fastest performance will likely use what type of virtualization?
Two virtual machines that have been cloned from the same template and that utilize D-Bus are performing erratically. They both have separate hostnames and network configuration settings. What command would be used to determine if each of the virtual machines have different D-Bus Machine IDs?
Use the export command to add a new directory to your path (this will not survive a reboot).
Use the unset command to delete the PATH variable. Try running a command (like sudo cat /etc/shadow) using sudo. What happened? Why? (Exiting your shell will return you to your original state.)
How can you view the number of lines in a file and recreate the file with each line prepended by its line number?
Explore your local /etc/passwd file with the grep, sed, head and tail commands per the tasks below: Which users have access to a Bash shell?
An analysis of the sizes of these files reveals that they range from 100M to 1000M. Complete the previous command with this new information, so that you may locate those backup files ranging from 100M to 1000M:
Complete this command, with the delete action so that these files will be removed:
In the /var directory, there exist four backup files:
db-jan-2018.backup db-feb-2018.backup db-march-2018.backup db-apr-2018.backup
Using tar, specify the command that would create an archive file with the name db-firstquarter-2018.backup.tar:
A simple backup routine periodically creates an image of partition `/dev/sda1` with `dd sda1.img`. To perform future data integrity checks, the routine also generates a SHA1 hash of the file with `sha1sum sda1.sha1`. By adding pipes and command `tee`, how would these two commands be combined into one?
Command `tar` is used to archive many files into a single file, preserving directory structure. Option `-T` allows to specify a file containing the paths to be archived. For example, `find /etc -type f | tar -cJ -f /srv/backup/etc.tar.xz -T -` creates a compressed tar file `etc.tar.xz` from the list provided by command `find` (option `-T -` indicates the standard input as the path list). In order to avoid possible parsing errors due to paths containing spaces, what command options should be present for `find` and `tar`?
Instead of opening a new remote shell session, command `ssh` can just execute a command indicated as its argument: `ssh user@storage “remote command”`. Given that `ssh` also allows to redirect the standard output of a local program to the standard input of the remote program, how would the `cat` command pipe a local file named `etc.tar.gz` to `/srv/backup/etc.tar.gz` at `user@storage` through `ssh`?
Changing process priorities is usually required when a process is occupying too much CPU time. Using ps with standard options for printing all system processes in long format, what –sort flag will sort processes by CPU utilization, increasing order?
Command schedtool can set all CPU scheduling parameters Linux is capable of or display information for given processes. How can it be used to display the scheduling parameters of process 1750? Also, how can schedtool be used to change process 1750 to real-time with priority -90 (as displayed by top)?
The basic structure of an HTML file starts with elements html, head, and body. Describe how addresses could be used in sed to display only the body element and its contents.
What sed expression will remove all tags from an HTML document, keeping only the rendered text?
