The Whole File:- Linux Interview Questions and Answers
You need to see the last fifteen lines of the files dog, cat and horse. What command should you use?
tail -15 dog cat horse
The tail utility displays the end of a file. The -15 tells tail to display the last fifteen lines of each specified file.
Who owns the data dictionary?
The SYS user owns the data dictionary. The SYS and SYSTEM users are created when the database is created.
You routinely compress old log files. You now need to examine a log from two months ago. In order to view its contents without first having to decompress it, use the _________ utility.
The zcat utility allows you to examine the contents of a compressed file much the same way that cat displays a file.
You suspect that you have two commands with the same name as the command is not producing the expected results. What command can you use to determine the location of the command being run?
The which command searches your path until it finds a command that matches the command you are looking for and displays its full path.
You locate a command in the /bin directory but do not know what it does. What command can you use to determine its purpose.
The whatis command displays a summary line from the man page for the specified command.
You wish to create a link to the /data directory in bob’s home directory so you issue the command ln /data /home/bob/datalink but the command fails. What option should you use in this command line to be successful.
Use the -F option
In order to create a link to a directory you must use the -F option.
When you issue the command ls -l, the first character of the resulting display represents the file’s ___________.
The first character of the permission block designates the type of file that is being displayed.
What utility can you use to show a dynamic listing of running processes? __________
The top utility shows a listing of all running processes that is dynamically updated.
Where is standard output usually directed?
to the screen or display
By default, your shell directs standard output to your screen or display.
You wish to restore the file memo.ben which was backed up in the tarfile MyBackup.tar. What command should you type?
tar xf MyBackup.tar memo.ben
This command uses the x switch to extract a file. Here the file memo.ben will be restored from the tarfile MyBackup.tar.
You need to view the contents of the tarfile called MyBackup.tar. What command would you use?
tar tf MyBackup.tar
The t switch tells tar to display the contents and the f modifier specifies which file to examine.
You want to create a compressed backup of the users’ home directories. What utility should you use?
You can use the z modifier with tar to compress your archive at the same time as creating it.
What daemon is responsible for tracking events on your system?
The syslogd daemon is responsible for tracking system information and saving it to specified log files.