UN110 Chap: 23, 24, 25, 26

What character or characters make up the shebang used in Linux to define the shell used for a shell script?

#!

What environment variable contains the username of the user who started the shell?

$USER

Frank wants to run his large number-crunching application in background mode on his console session. What command does he need to use to do that?

&

Where does Linux create files to send data to and receive data from directly with devices?

/dev

What file does the Linux system use to track ports used to communicate with PCI boards?

/proc/ioports

Henry needs to store the output from his script into a log file that he can read later. What character or characters should he use to do that?

>

When will the cron table entry 10 5 * * * myscript run the specified shell script?

At 5:10 a.m. every day

How do you determine the default job running in a console session?

By a plus sign next to the job number in the jobs output

Sophia needs to connect her Linux system to a new network printer on the office network. What software package does she need to ensure is installed so she can configure the new network printer?

CUPS

Harry has modified an application to create a file in a directory and then write data to it. The program creates the file with no problems but cannot write data to it and receives a permission error. Which of the following is most likely the issue?

Permission inheritance

When Melanie runs a shell script, she notices that it takes up all of the memory on her Linux system and she needs to stop it. How can she do that?

Press Ctrl+C while the script is running.

How can you temporarily pause a shell script from running in foreground mode in a console session?

Press the Ctrl+Z key combination.

Nick needs to run a report at midnight every day on his Linux system. How should he do that?

Schedule the job using cron.

Peter's system has a memory-intensive application running on it continually. To help improve performance, he has replaced the old hard drives with solid-state drives instead of increasing RAM. Which of the following is most likely true about this situation?

The SSD for swap will become degraded storage.

What command allows you to run a shell script at a specific time?

at

Jane needs to check on what jobs are scheduled to run automatically for her user account. What command should she use to list the cron table entries for her user account?

crontab

Which Linux command displays the contents of the kernel ring buffer?

dmesg

Barbara has an application running in background mode in her console session and needs to bring it to foreground mode. What command should she use to do that?

fg

Mary confirms via the sealert utility that her application cannot access the file flash.txt. What command should she use next?

ls -Z flash.txt

Joel installed a new PCI card in his Linux system but is now getting a conflict with another device on the system. What command can he use to display the interrupts, I/O ports, and DMA channels in use by all of the existing devices?

lsdev

What command do you use to disconnect a shell script from the current console so that it can continue to run after the console exits?

nohup

Ben updates his Ubuntu system's packages using the sudo apt-get upgrade command, and now the Apache Web service is not working properly. What command should he run?

sudo apt-get check

Jasmine has created a new bash shell script and wants to run it from the command line. What chmod permissions should she assign to the file to run it as a shell script?

u+x

Which program allows you to reload the defined rules for detecting and installing new devices?

udevadm

What character or combination of characters do you use to redirect the output of one command to another command?

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