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Linux is, in simplest terms, an operating system. It is the software on a computer that enables applications and the computer operator to access the devices on the computer to perform desired functions. The operating system (OS) relays instructions from an application to, for instance, the computer's processor. Linux (often pronounced LIH-nuhks with a short "i") is a Unix-like operating system that was designed to provide personal computer users a free or very low-cost operating system comparable to traditional and usually more expensive Unix systems.

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Question	Rating	View Answer
What is difference between AT and CRON?		View Answer
What command you execute to display the last five commands you have entered? Which partitions might you create on mail server HDDs other than the root, swap and boot partitions? Which partitioning tool is available in all distributions? Which two commands can you use to delete directories? Which file defines all users on your system?		View Answer
Using command substitution, how would you display the value of the present working directory? Choose one a. echo $(pwd) b. echo pwd c. $pwd d. pwd \| echo		View Answer
Which daemon controls the network service -> POP3 mail service? A) inetd B) pop3d C) maild D) nntpd E) pmaild		View Answer
You attempt to use shadow passwords but are unsuccessful. What characteristic of the /etc/passwd file may cause this? Choose one: a. The login command is missing. b. The username is too long. c. The password field is blank. d. The password field is prefaced by an asterick.		View Answer
You have a large spreadsheet located in the /data directory that five different people need to be able to change. How can you enable each user to edit the spreadsheet from their individual home directories? Choose one: a. Create a symbolic link in the /data directory. b. Copy the spreadsheet to each user's home directory. c. Create a hard link in each user's home directory. d. Create a script to move the spreadsheet to which ever user's home directory who needs to edit it.		View Answer
In order to schedule a cronjob, the first task is to create a text file containing the jobs to be run along with the time they are to run. Which of the following commands will run the script MyScript every day at 11:45 pm? Choose one: a. * 23 45 * * MyScript b. 23 45 * * * MyScript c. 45 23 * * * MyScript d. * * * 23 45 MyScript		View Answer
How can u schedule a job using cron for 20 secs?		View Answer
You have a file called salesdata and create symbolic links to it in bob's home directory. Bob calls you and says that his link no longer works. How can you fix the link? Choose one: a. The file salesdata has been deleted. You will have to restore it from a backup. b. You will need to delete the symbolic link in bob's directory and recreate it. c. Rename the link in bob's directory to salesdata.lnk. d. Change the owner of the link in bob's directory and change the permissions to give others read and write permissions.		View Answer
What command is used to remove the password assigned to a group?		View Answer
What is the minimum number of partitions you need to install Linux? What command can you use to review boot messages?		View Answer
You are going to install a new hard disk in your system. Which of the following commands will halt your system so you can install the new hardware? Choose one: a. shutdown -k now b. shutdown -h now c. shutdown -r now d. shutdown -t now		View Answer
What is the purpose of the command xargs? Choose one: a. xargs is used to pass arguments from one command to another. b. xargs is used to redirect standard output to a file. c. xargs is used to redirect standard error to a file. d. xargs is used to use the contents of a file as standard input.		View Answer
You typed the following at the command line ls -al /home/ hadden. What key strokes would you enter to remove the space between the '/' and 'hadden' without having to retype the entire line? Choose one a. Ctrl-B, Del b. Esc-b, Del c. Esc-Del, Del d. Ctrl-b, Del		View Answer
You are debugging a new application that is crashing. You want to watch the messages as they are being written to the log. What command should you use? Choose one: a. tail b. head c. less d. log		View Answer
You want to delete the following directories and their files /home/bob/letters /home/bob/sales so you issue the command rmdir /home/bob/letters but the command fails. What went wrong? Choose one: a. You need to first delete the sales subdirectory and its files before deleting its parent directory, letters, and its files. b. There is no such command as rmdir. c. The rmdir command cannot remove directories that are not empty. d. The rmdir command will not remove directory heirarchies.		View Answer
What are the common problems with threads?		View Answer
Explain about return code?		View Answer
Which file do you edit to set up a printer? A) /etc/printtab.conf B) /etc/print.conf C) /etc/lp.conf D) /etc/printtab E) /etc/printers		View Answer
Which command do you use to change run levels? A) initlevel B) runlevel C) level D) run E) init		View Answer