Vendor Name: RedHat
Exam code: RH033
Exam Name: Red Hat Linux Essentials
Click the link below to get full version
http://www.certifyguide.com/exam/RH033/
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Question: 1
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You work as a Network
Administrator for McNeil Inc. The company has a Linux-based network. A printer
is configured on the network. You want to remove a file from a print queue.
Which of the following commands will you use to accomplish this?
A. LPR
B. LPQDEL
C. LPRM
D. LPQ
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Answer: C
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Explanation:
The LPRM command is used to
remove a file from a print queue.
Answer option D is incorrect.
The LPQ command reports the status of a print queue.
Answer option A is incorrect.
The LPR command is used to submit a file for printing.
Answer option B is incorrect.
There is no command such as LPQDEL in Linux.
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Question: 2
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You are a newly appointed Red
Hat Technician for company Inc. The company has a Linux-based network. You want
to install a package named httpd on your Linux system. Before installing the
package, you want to get the list of those packages that httpd depends on.
Which of the following commands will you use to accomplish the task?
A. rpm deplist httpd
B. yum deplist httpd
C. yum list httpd
D. rpm -qR httpd
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Answer: B
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Explanation:
If the package is not yet
installed, the yum deplist httpd command is used to get the list of packages
that httpd depends on.
Answer option C is incorrect.
The yum list httpd command can be used to list various information about
available packages. For example, it lists all available and installed packages
and all packages with updates available in the yum repositories.
Answer option D is incorrect.
If the package is already installed, the rpm -qR httpd command is used to get
the list of packages that this package depends on.
Answer option A is incorrect.
This command is incorrect. The deplist option is not used with the rpm command.
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Question: 3
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You work as the Network
Administrator for McNeil Inc. The company has a Linux-based network. You are
working as a root user on Red Hat operating system. You are currently running a
program named My_program. You are getting some error messages while executing
the program. You want to redirect these error messages to a file named file2
rather than being displayed on the screen. Which of the following tools should
you use to accomplish the task?
A. My_program >>
file2
B. My_program 2> file2
C. My_program 2>> file2
D. My_program > file2
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Answer: B
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Explanation:
This command will execute a
program named My_program and whatever errors are generated while executing that
program will all be added to a file named file2 rather than being displayed on
the screen.
What is redirection of STDIN,
STDOUT, STDERR in Linux?
Redirection means diverting
data from their normal destination to another. Whenever a program is executed
on terminal some output is displayed at the shell prompt. In case a user does
not want that output to appear in the shell window, the user can redirect it
elsewhere. The user can redirect the output into a file, printer, etc.
Not only the output of programs is redirected,
but also input of a program and error messages are redirected to a file.
Common Redirection operators are as follows:
Answer option D is incorrect.
This command will direct the standard output of My_program to file2.
Answer option A is incorrect.
This command will append the standard output of My_program to file2.
Answer option C is incorrect.
This command cannot be applied in this scenario.
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Question: 4
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Which of the following
key-combinations is used to redo a change undone by a u command in vim?
A. Ctrl-w, Arrow
B. Ctrl-w, s
C. Ctrl-r
D. Ctrl-w, v
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Answer: C
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Explanation:
The Ctrl-r key-combination is
used to redo a change undone by a u command in vim. You can go back in time
with the undo command. You can then go forward again with the redo command. If
you make a new change after the undo command, the redo will not be possible
anymore.
Answer options B and D are
incorrect. The Ctrl-w, s and Ctrl-w, v key-combinations are used to view a file
in two windows in a single vim screen. Ctrl-w, s splits the screen horizontally
and Ctrl-w, v splits the screen vertically.
Answer option A is incorrect.
The Ctrl-w key-combination with an arrow key is used to jump from one window to
another. This will move you to the next window in whichever direction the arrow
would normally move your cursor.
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Question: 5
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You work as the Network
Administrator for Perfect solutions Inc. The company has a Linux-based Network.
You are working as a root user.
You want to know what the day
will be on 20 July 2010. Which of the following commands should you use to
accomplish this task?
A. cal
B. cal 20 July
C. cal 7 2010
D. date
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Answer: C
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Explanation:
The cal 7 2010 command will
display the calendar of July 2010.
What is the cal command?
The cal command prints an
ASCII calendar of the current month.
Syntax:
cal [month] [year]
Given a month and year as arguments, cal
displays the calendar for that particular month of the given year.
When a single numeric argument (such as 2005)
is given, cal will display a calendar for the given year. Always use a four-digit
year. For example, the command cal 05 will display the calendar for the year
05, not the year 2005.
Answer option B is incorrect.
The cal 20 July command will display only the month and year, and not the date.
Answer option A is incorrect.
The cal command will display the calendar of the current month.
Answer option D is incorrect.
The date command will display the current date and time of the system.
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Question: 6
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Which of the following
commands is used to access Windows resources from Linux workstation?
A. rsync
B. mutt
C. scp
D. smbclient
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Answer: D
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Explanation:
smbclient is a command-line
tool that provides access to SMB/CIFS shares.
What is the smbclient command?
smbclient is a command-line
tool that provides access to SMB/CIFS shares. smbclient is a samba client with
an "ftp like" interface. It is a useful tool to test connectivity to
a Windows share. It can be used to transfer files, or to look at share names.
In addition, it has the ability to backup and restore files from a server to a
client and visa versa.
Example:
#smbclient -L server1
The above command will list all shares on
server1.
Some useful options are as follows:
Answer option C is incorrect.
scp copies files between hosts on the Linux network.
Answer option A is incorrect.
rsync is a fast and extraordinarily versatile file copying tool. It can copy
locally, to/from another host over any remote shell or to/from a remote rsync
daemon.
What is rsync?
In computing, rsync is a
software application for Unix systems. It synchronizes files and directories
from one location to another while minimizing data transfer using delta
encoding. It can copy or display directory contents and copy files, optionally
using compression and recursion.
In daemon mode, rsync listens to the default
TCP port of 873, serving files in the native rsync protocol or via a remote
shell such as RSH or SSH. In the latter case, the rsync client executable must
be installed on both the local and remote hosts.
Answer option B is incorrect.
mutt is a small but very powerful text based program for reading electronic
mail under Linux operating systems.
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Question: 7
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You want to temporarily change
your primary group to another group of which you are a member. In this process,
a new shell will be created, and when you exit the shell, your previous group
will be reinstated. Which of the following commands will you use to accomplish
this task?
A. chmod
B. newgrp
C. chgrp
D. chown
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Answer: B
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Explanation:
According to the scenario, you
will use newgrp command to accomplish the task. The newgrp command is used to
temporarily change the primary group of a user into another group of which that
user is a member. In this step, a new shell will be created, and when that user
will exit from the shell, his previous group will be reinstated. If no group is
specified, the GID is changed to the login GID.
Answer option C is incorrect.
John will not use the chgrp command to accomplish his task. The chgrp (from
change group) command is used by unprivileged users to change the group
associated with a file. Unlike the chown command, chgrp allows regular users to
change groups, but
only to one of which they are
a member. The general syntax of the chgrp command is as follows:
chgrp group target1 [target2
..]
The group parameter indicates
the new group with which the targets should be associated.
The target1 parameter
indicates the files or directories for which the change should be made.
The target2 parameter
indicates the optional additional files or directories for which the change
should be made.
For example:
The above command changes the
group associated with ttt to 'system', provided the executing user is a member
of that group.
Answer option D is incorrect.
John will not use the chown command to accomplish his task. The chown command
is used to change the user and/or group ownership of each given file as
specified by the first non-option argument as follows:
if only a user name (or
numeric user ID) is given, that user is made the owner of each given file, and
the file's group is not changed.
If the user name is followed
by a colon and a group name (or numeric group ID), with no spaces between them,
the group ownership of the files is changed as well.
The syntax of the chown
command is as follows:
chown [-R [ -H | -L | -P ]] [
-h ] owner[:group] file ...
Answer option A is incorrect.
The chmod command is used to
change the access mode of a file. The syntax of the command is:
chmod who=permissions filename
Here, "who" refers
to the owner of the file, group members, or other users, and permissions refers
to "rwx".
For example, chmod 755
File.txt will give all access permissions to the owner and the read and execute
permissions to the group members and other users.
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Question: 8
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Fill in the blank with the
required permission to complete the statement below.
In order to make a script
executable in a Linux computer, you must assign the___________ permission to
the script file.
A. execute
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Answer: A
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Explanation: In order to run
the script, you are required to add the execute permission to the script file.
The permission can be assigned through the chmod command.
What is the chmod command?
The chmod command is used to
change file access permissions in Linux.
Syntax:
chmod [option] [mode] <file1, file2,
...>
Option: The following is a list of some
important options that can be provided with the command:
Mode: Mode is written in the following
format:
[ugoa] [+-=] [rwxXstugo]
The combination of ugoa
specifies the users for whom the file access permissions will be changed. In
ugoa, u is for the user who owns the file, g is for other users in the file
group, o is for other users not in the file group, and a is for all users.
The operator + adds the
specified permissions to the existing permissions of each file. The - operator
removes, and the = character specifies that the specified permissions are the
only permissions for that file.
The combination of rwxXstugo
is permission type. In rwxXstugo, r is for read, w is for write, x is for
execute, X is to execute only if the file is a directory or already has execute
permission for some user, s is to set user or group ID on execution, t is to
save program text on swap device, u are the permissions that the user who owns
the file currently has for it, g are the permissions that other users in the
file group have for the file, and o are the permissions that other users not in
the file group have for the file.
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Question: 9
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You work as a Network
Administrator for McNeil Inc. The company has a Linux-based network. David, a
Sales Manager, wants to know the name of the shell that he is currently using.
Which of the following commands will he use to accomplish the task?
A. ECHO $shell
B. RM $shell
C. MV $shell
D. LS $shell
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Answer: A
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Explanation:
In order to know the name of
the current shell, he will run the following command:
ECHO $shell
The command line interpreter
in Linux is known as the shell. When a user runs a command, the shell
interprets, processes, and executes the command and provides an output to the
user. Linux comes with quite a few shells such as Bourne Shell, Bourne Again
Shell (BASH), C Shell, Korn Shell, etc. Bash is the most popular shell used by
Linux users.
What is BASH?
The Bourne Again Shell (BASH)
is a command language interpreter for the GNU's Not Unix (GNU) operating
system. The following files are used to configure BASH:
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Question: 10
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Which of the following text
editing tools can be used to edit text files without having to open them?
A. less
B. sed
C. vi
D. more
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Answer: B
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Explanation:
The Unix utility sed (stream
editor) is a text editing tool that can be used to edit text files without
having to open them. This utility parses text files and implements a
programming language which can apply textual transformations to such files. It
reads input files line by line (sequentially), applying the operation which has
been specified via the command line (or a sed script), and then outputs the
line.
Answer option D is incorrect.
The more command is used to view (but not modify) the contents of a text file
on the terminal screen at a time.
The syntax of the more command
is as follows:
more [options] file_name
Where,
Answer option A is incorrect.
The less command is used to view (but not change) the contents of a text file,
one screen at a time. It is similar to the more command. However, it has the
extended capability of allowing both forward and backward navigation through
the file. Unlike most Unix text editors/viewers, less does not need to read the
entire file before starting; therefore, it has faster load times with large
files.
The command syntax of the less
command is as follows:
less [options] file_name
Where,
Answer option C is incorrect.
The vi editor is an interactive, cryptic, and screen-based text editor used to
create and edit a file. It operates in either Input mode or Command mode. In
Input mode, the vi editor accepts a keystroke as text and displays it on the
screen, whereas in Command mode, it interprets keystrokes as commands. As the
vi editor is case sensitive, it interprets the same character or characters as
different commands, depending upon whether the user enters a lowercase or
uppercase character. When a user starts a new session with vi, he must put the
editor in Input mode by pressing the "I" key. If he is not able to
see the entered text on the vi editor's screen, it means that he has not put
the editor in Insert mode. The user must change the editor to Input mode before
entering any text so that he can see the text he has entered.
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Question: 11
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Which of the following
commands will you run to do case-sensitive search for files named
foobar.png?
A. locate -name
foobar.png
B. find -iname foobar.png
C. grep-name foobar.png
D. find -name foobar.png
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Answer: D
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Explanation:
You will use find -name
foobar.png command to do case-senstive search for files named foobar.png.
What is the find command?
The find command can perform a
search based on a variety of search limitations. It searches through one or
more directory tree(s) of a filesystem, locating files based on some
user-specified criteria. By default, find returns all files in the current
working directory. Further, find allows a user to specify an action to be taken
on each matched file. Thus, it is an extremely powerful command for applying
actions to many files.
The find command can be used with a wild card
(*), but it works best when we know the name of the file or directory we are
looking for.
The find command can search your system for
files that comply with certain numeric criteria, such as the size of the file
(-size), the number of links to the file (-links), the date of the last change
to the files data (-mtime), or the date of the last time the file was read
(-atime). All these criteria accept a numeric value. When a numeric value is
provided to find, it looks
for an exact match, more than
the number, or less than the number.
Answer option B is incorrect.
The find -iname foobar.png command will do case-insensitive search for files
named foobar.png.
Answer option C is incorrect.
The grep-name foobar.png is an invalid command.
What is the grep command?
The grep command is used to
search for a specific pattern of text in a file. It helps administrators in
searching large amounts of text for a certain error message or name.
Answer option A is incorrect.
The locate -name foobar.png is an invalid command.
What is the locate command?
The locate command is used to
search for matching files in a database that is usually updated daily by a cron
job. On the forthcoming Linux operating systems, this command is usually
replaced by the slocate command, which stores permissions as well as paths and
thus prevents users from prying into directories. One more advantage of the
locate command is that it matches against any part of a pathname, not just the
file itself.
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Question: 12
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You work as the Network
technician for McNeil Inc. The company has a Linux-based Network. You are
working on the Red Hat operating system. You want to remove some write
protected files and directories. Which of the following commands should you use
to accomplish this task?
A. rm -rf
B. rm -f
C. rmdir
D. rm
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Answer: A
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Explanation:
The rm -rf commarecursively
removes directories and its contents, ignoring warnings about removing
write-protected files and directories.
Answer option B is incorrect.
rm -f removes only files forcibly not a directory. To remove a directory and
its contents forcibly, use -r in combination with -f with the rm command.
Answer option C is incorrect.
The rmdir command is use to remove an empty directory.
Answer option D is incorrect.
rm with no arguments deletes files.
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Question: 13
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Which of the following options
is used with aspell to specify the location of the main word list?
A. d,--master=string
B. -p,--personal=file
C. --jargon=string
D. --dict-dir=dir
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Answer: D
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Explanation:
The following options may be
used with the aspell command to control which dictionaries to use and how they
behave:
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Question: 14
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Which ftp client command
allows you to upload multiple files simultaneously using the "*"
wildcard?
A. mput
B. mget
C. put
D. get
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Answer: A
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Explanation:
The mput command is used to
upload multiple files simultaneously.
Answer option C is incorrect.
The put command uploads one file each time you use the command. It is not used
to upload multiple files at a time.
Answer option D is incorrect.
The get command is used to download one file at a time.
Answer option B is incorrect.
The mget command is used to download multiple files at a time. It is not used
to upload multiple files.
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Question: 15
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Which of the following
commands copies files between hosts on a network and uses the same
authentication as ssh, and will ask for passwords or passphrases if they are
needed for authentication?
A. scp
B. rcp
C. cp
D. mv
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Answer: A
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Explanation:
The scp command copies files
between hosts on a network. It uses ssh for data transfer, and uses the same
authentication and provides the same security as ssh. Unlike rcp, scp will ask
for passwords or passphrases if they are needed for authentication. Any file
name may contain a host and user specification to indicate that the file is to
be copied to/from that host. Copies between two remote hosts are permitted.
Answer option B is incorrect.
The rcp command copies files between machines. The rcp command does not prompt
for passwords; it uses
Kerberos authentication when
connecting to rhost.
Answer option C is incorrect.
The cp command copies files and directories. It is generally used to make a
backup copy of a file or to copy a file
from one directory to another.
Answer option D is incorrect.
The mv command moves files and directories from one directory to another or
renames a file or directory.
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