RH033 Exam Dumps - RedHat RHCT Questions and Answers

According to the question's requirement, the following time specifications can be set for the cron

job:

30 17 * * 5

30 17 * * FRI

In this time specification, you can define five parameters. The first two parameters define minutes and hours of the day. The last or the fifth parameter shows the day of the week. It can be the name or the number of a day. Numbers 0 and 7 are for Sunday, whereas from Monday to

Saturday, the numbers are from 1 to 6.

According to the scenario, John will execute the foo && bar; command. Because of the && operator, bar will execute if and only if foo completes successfully.

Answer option C is incorrect. The foo; bar; command sequence will run foo and bar in a sequential manner, but the successful completion of the first command does not matter.

Answer option D is incorrect. The foo || bar; command sequence will run the bar if and only if foo fails to complete successfully.

Answer option B is incorrect. In the foo | bar; command sequence, the output of the foo command will be the input for the bar command.

This command looks for files on the system whose data has been changed exactly five days ago.

Kernel files do not change regularly and therefore are contained in the /boot directory, not in the

/var directory.

What is the /var directory?

According to the Filesystem Hierarchy Standard, the /var directory contains regularly-changing system files. This comprises spool directories and files, and administrative and logging data.

Answer option A is incorrect. System log files are stored in the /var directory.

Answer options D and C are incorrect. Print spool files and email-spools are variable data files and therefore are contained in the /var directory.

The jobs command lists the jobs that are running in the background and in the foreground. If the prompt is returned with no information, no jobs are present.

Syntax:

jobs [-p | -l] [-n] [-p] [-x] [job id]

Some important options used with jobs command are as follows:

Answer option A is incorrect. The top command is used to produce a frequently-updated list of processes. By default, the processes are ordered by percentage of CPU usage, with only the "top" CPU consumers shown. This command shows how much processing power and memory are being used, as well as other information about the running processes. The following figure demonstrates the output of the top command:

Answer option B is incorrect. The bg command can be used to resume in the background when a process is suspended.

Answer option C is incorrect. There is no such command as job.

The Evolution and Mozilla are the Graphical Mail clients in Red Hat Enterprise Linux.

You will use the lpstat -s command to accomplish the task. The lpstat -s command gives you information about what printers are configured on your computer and how you can connect to them.

Answer option A is incorrect. The lpstat -p command is used to list the printers configured on your computer.

Answer options C and D are incorrect. The lpstat -d and lpr commands are used to list the default printer on your computer.

The bg utility resumes suspended jobs from the current environment by running them as background jobs if job control is enabled. If the job specified by job_id is already a running background job, the bg utility will have no effect and shall exit successfully. Using bg to place a job into the background will cause its process ID to become "known in the current shell execution environment", as if it had been started as an asynchronous list.

Answer option D is incorrect. The fg utility continues a stopped job by running it in the foreground, some shells are not able to run this command.

Syntax:

fg [%job] Where %job specifies the job that a user wants to run in the foreground.

Answer option A is incorrect. The jobs command lists the jobs that are running in the background and in the foreground. If the prompt is returned with no information, no jobs are present.

Syntax: jobs [-p | -l] [-n] [-p] [-x] [job id]

Some important options used with jobs command are as follows:

Answer option C is incorrect. The top command is used to produce a frequently-updated list of processes. By default, the processes are ordered by percentage of CPU usage, with only the "top" CPU consumers shown. This command shows how much processing power and memory are being used, as well as other information about the running processes. The following figure demonstrates the output of the top command:

The ls command is used to list files on a Linux computer. The syntax of the ls command is as follows:

ls [option] [directory name]

Several options are used with the ls command. Following is a list of some important options:

For example, the following command displays all the files (including hidden files) in the /home directory and the contents in the subdirectories:

What is >> command?

The >> command is used for storing the output generated by different commands. It creates a file specified to store the output. If the specified file already exists, it appends that file.

Answer option A is incorrect. The > command is used for storing the output generated by different commands. It creates a file specified to store the output. If the specified file already exists, it overwrites that file.

Answer options C and B are incorrect. Improper syntax has been followed in these answer options.

Mail delivery is most typically done through one of the SMTP family of protocols, either SMTP or

ESMTP.

What is the ESMTP protocol?

ESMTP (Extended Simple Mail Transfer Protocol) specifies extensions to the original protocol for sending e-mail that supports graphics, audio and video files, and text in different national languages. The original

Internet protocols for sending e-mail are described in Request for Comments (RFC) 822, Standard for the Format of ARPA

Internet Text Messages, and in RFC 821, Simple Mail Transfer Protocol (SMTP). As users demanded to attach various kinds of files to email, the need for additional facilities arose and resulted in RFC 1869, Extended Simple Mail Transfer Protocol. ESMTP provides the facility for a client e-mail program to ask a server e-mail program which facilities it supports and then communicate accordingly.

Answer options A and D are incorrect. IMAPS and POP3S are used for mail pickup.

What is the POP3S protocol?

Post Office Protocol version 3 (POP3) is the protocol that clients use to pick up mail from servers.

Users of POP3 generally store their mail locally on their system and configure their mail client to pick up new mail periodically.

POP3 servers need clients to authenticate with a username and password. This ensures that only authenticated clients can pick up the user's email. Unfortunately, POP3 is an unencrypted protocol, so the username and password travel in cleartext.

POP3S, on the other hand, is POP3 over Secure Sockets Layer. It provides an encrypted connection for the Post Office Protocol. More significantly, it provides an encrypted connection over which the username and password may be transmitted for authentication purposes.

The departmental mail server provides POP3 (internally) and POP3S (internally and externally).

Ultimately, POP3 support will be turned off in favor of IMAPS, which is a more modern protocol that can do everything POP3 can.