RedHat RH033 - Red Hat Linux Essentials

A file's inode number can easily be found by using the ls command with the -i option.

What is an inode?

An inode is a data structure in Unix file systems, which holds key information about a file. A file is uniquely identified by its

inode number. An inode contains the following information about a file:

Owner's user identification number

Owner's group identification number

Device on which the inode resides

Locking information of the file

Mode and type of file

Number of links to the file

Size of the file

Access and modification time of the file

Modification time of the inode

Addresses of the blocks of the file on the disk

Answer option D is incorrect. ls without arguments lists the names of files and directories in the current directory.

Answer option A is incorrect. The cat command only displays the contents of a file, not the file's inode number.

Answer option C is incorrect. This command displays the long listing of files and directories. It will not display the inode number of a file.

The commands to put data from a buffer into the document are p and P. p puts the data below the current line and P puts the data above the current line.

What is the p command?

The p command is used to put (paste) data from a buffer into the document. If data is line oriented

(a line or a paragraph), the p command will open a new line below the current line and place the data on this line. If data is character oriented (a letter, word, or sentence), the p command will place the data after the cursor.

What is the P command?

The P command is used to put data from a buffer into a document. How this command works depends on the nature of the data in the buffer. If the data is line oriented, the P command will open a new a line above the current line and paste the data there. If the data is character oriented, the P command will put the data before the cursor. Answer option D is incorrect. The ps command displays the status of the current processes in Linux. Answer option A is incorrect. The :set command lists a small number of important configuration items in vim.

The cmd1 2>&1 | cmd2 command pipes stdout and stderr from cmd1 to cmd2.

Answer option C is incorrect. The cmd1 | cmd2 command pipes stdout from cmd1 to cmd2.

Answer option B is incorrect. The cmd2 2>&1 | cmd1 command pipes the stdout and stderr from cmd2 to cmd1.

Answer option A is incorrect. The cmd2 | cmd1 command pipes stdout from cmd2 to cmd1.

If no path is given, find looks in the current directory and its subdirectories. Using the -i option tells the find command to perform caseinsensitive search for files named snow.html. It will show all files named snow.html, Snow.html,

SNOW.html in the current directory.

Answer option B is incorrect. This command will only search for files named snow.html in the current directory with case-sensitiveness. It will not search for those files named Snow.html, SNOW.html.

Answer option C is incorrect. This is an incorrect command; it will show an error message.

Answer option D is incorrect. This is also an incorrect command, there should be a name after -i in the command.

The manual section 8 of MAN pages provides help information for administrative commands.

Manpages are grouped into sections. Sometimes a user has to know the appropriate section in which he wants to search for an item. For example, if a user is interested in the print Clanguage function rather than the command, he has to tell the man program to search the section on library functions. The user can enter the following command to search the c-language print function: man 3 print

The various MAN sections are as follows:

According to the scenario, the S status message shows that the process id 24224 is in sleeping status.

The ps -aux command reports the status of processes currently running on a Linux computer. It shows the following status messages:

aspell is a utility that can function as an ispell -a replacement, as an independent spell checker, as a test utility to test out Aspell features, and as a utility for managing dictionaries.

Syntax:

aspell [options]

Some important options used with aspell are as follows:

Answer option B is incorrect. The nice command is used to change the priority of a process in the kernel's scheduler. A niceness of -20 is the highest priority and 19 is the lowest priority. The default niceness for processes is inherited from its parent process, usually 0. For example, when specifying a very low priority, the following command can be entered: nice -n 19 cc -c *.c &

The above command runs the cc command in the background at a lower priority than the default priority set by the nice command.

Answer options D and A are incorrect. There are no such spell checkers as inspell and spell.

The cat command concatenates both files foo.txt and student.txt together and | (pipe) will send the standard output of the cat command to the standard input of the less command, and this will show the output of both files on one screen at a time.

You will use the yum install firefox command to install the package named firefox in the Linux system. This command will search the configured repositories for the package named firefox, and if found, will install the latest version, pulling in dependencies if needed.

Answer options B and D are incorrect. The -ivh and i options are not used with the yum command.

Answer option A is incorrect. The yum update firefox command is used to update a package in the Linux system. It is not used to install a package in Linux. If run without any specified package, the update option will update every currently installed package. If one or more packages are specified, yum will only update the listed packages. While updating packages, yum will ensure that all dependencies are satisfied.

You can use the file command to display the file types of all the files in a directory at a time. In order to accomplish the task, you will have to issue the following command:

file *

What is the file command?

The file command is used to analyze the files specified in the argument.

Syntax:

file [] [] ...

By providing the name of a file as an argument, the file command analyzes the file. The file command supports multiple arguments. The asterix (*) metacharacter can also be used with the file command.

Answer option C is incorrect. In Linux, the mount command is used to mount and display disks, partitions, and file systems. Mounting refers to the process in which the operating system prepares the media to be read.

Answer option A is incorrect. The File System Check (fsck) command is used to scan all disks and partitions, and it repairs them if required. The fsck command should be run only on an unmounted file system.

Answer option D is incorrect. The init command is used to switch a Linux computer to different run levels.