010-160 Exam Dumps - Linux Essentials Certificate Exam - version 1.6

Go to page:

Question # 9

Which of the following tasks can the command passwd accomplish? (Choose two.)

Change a user's username.

Change a user's password.

Create a new user account.

Create a new user group.

Lock a user account.

Full Access

Question # 10

Which of the following are typical services offered by public cloud providers? (Choose three correct answers.)

Platform as a Service(PaaS)

Infrastructure as a Service(IaaS)

Internet as a Service(IaaS)

Graphics as a Service (GaaS)

Software as a Service (SaaS)

Full Access

Question # 11

Which of the following examples shows the general structure of a for loop in a shell script?

for *.txt as file => echo $file

for *.txt ( echo $i )

for file in *.txt do

echo $i done

for ls *.txt exec {} \;

foreach @{file} { echo $i

}

Full Access

Answer:

Explanation:

The general structure of a for loop in a shell script is as follows12:

for variable in list do commands done

The variable is the name of a loop counter or iterator that takes on the values of the items in the list. The list can be a sequence of words, numbers, filenames, or the output of a command. The commands are the body of the loop that are executed for each value of the variable. The do and done keywords mark the beginning and the end of the loop body.

The option C. for file in *.txt do echo $i done follows this structure, with the variable being file, the list being *.txt (which matches all the files with the .txt extension in the current directory), and the command being echo $i (which prints the value of the variable i, which is presumably set somewhere else in the script).

The other options are incorrect because:

A. for *.txt as file => echo $file uses an invalid syntax for a for loop. The as keyword is not part of the shell script syntax, and the => symbol is not a valid operator. The correct way to write this loop would be:

for file in *.txt do echo $file done

B. for *.txt ( echo $i ) uses an invalid syntax for a for loop. The parentheses are not part of the shell script syntax, and the loop body is missing the do and done keywords. The correct way to write this loop would be:

for i in *.txt do echo $i done

D. for ls *.txt exec {} ; uses an invalid syntax for a for loop. The ls command is not a valid variable name, and the exec {} ; is not a valid command. This looks like a mix of a for loop and a find command. The correct way to write this loop would be:

for file in *.txt do exec $file done

E. foreach @{file} { echo $i } uses an invalid syntax for a for loop. The foreach keyword is not part of the shell script syntax, and the @{file} and { echo $i } are not valid expressions. This looks like a mix of a for loop and a Perl syntax. The correct way to write this loop would be:

for file in * do echo $file done

References:

Looping Statements | Shell Script - GeeksforGeeks
How do I write a â€˜forâ€™ loop in Bash? - Stack Overflow

Question # 12

Which of the following outputs could stem from the commandlast?

1 ls

2 cat text.txt

3 logout

Password for user last changed at Sat Mar 31 16:38:57 EST 2018

Last login: Fri Mar 23 10:56:39 2018 from server.example.com

EXT4-fs (dm-7): mounted filesystem with ordered data mode. Opts: (null)

root tty2 Wed May 17 21:11 - 21:11 (00:00)

Full Access

Question # 13

What is true about thedmesgcommand? (Choose two correct answers.)

It traces the execution of a command and shows each step the program carries out.

It sends messages to the command lines of all current user sessions.

It displays the content of the Linux kernelâ€™s ring buffer.

It immediately outputs all new messages written to the system journal.

It might not display older information because it was overwritten by newer information.

Full Access

Question # 14

Which of the following commands can be used to resolve a DNS name to an IP address?

dnsname

dns

query

host

iplookup

Full Access

Question # 15

Which command copies the contents of the directory /etc/, including all sub-directories, to /root/?

copy /etc /root

cp -r /etc/* /root

cp -v /etc/* /root

rcp /etc/* /root

cp -R /etc/*.* /root

Full Access

Answer:

Explanation:

Â The correct command to copy the contents of the directory /etc/, including all sub-directories, to /root/ isÂ cp -r /etc/* /root. This command uses the cp command, which stands for copy, and is used to copy files and directories on Linux and Unix systems.Â The command also uses the following options and arguments123:

The -r option, which stands for recursive, and tells cp to copy all files and sub-directories of the source directory. Alternatively, the -R option can be used, which has the same effect as -r.
The /etc/* argument, which specifies the source directory and all its contents. The asterisk (*) is a wildcard character that matches any file or directory name. This argument tells cp to copy everything inside the /etc/ directory, but not the directory itself.
The /root argument, which specifies the destination directory. This argument tells cp to copy the source files and sub-directories to the /root/ directory.

The other options are incorrect because they use different commands or syntax that do not copy the contents of the directory /etc/, including all sub-directories, to /root/. For example:

Option A uses the copy command, which is not a valid Linux command. The correct command is cp.
Option C uses the -v option, which stands for verbose, and tells cp to print verbose output. This option does not affect the copying process, but only the output. It also does not include the -r or -R option, which is necessary to copy the sub-directories.
Option D uses the rcp command, which stands for remote copy, and is used to copy files between different hosts on a network. This command is not relevant for copying files on the same host.
Option E uses the -R option, which is correct, but also uses theÂ .Â argument, which is incorrect. The dot (.) is a special character that matches any single character. This argument tells cp to copy only the files and directories that have a dot in their name, which may exclude some files and directories that do not have a dot.

References:Â 1: Cp Command in Linux (Copy Files) | LinuxizeÂ 2: cp command in Linux with examples - GeeksforGeeksÂ 3: How to Copy Files and Directories in the Linux Terminal

Question # 16

Which of the following Linux Distributions is derived from Red Hat Enterprise Linux?

Raspbian

openSUSE

Debian

Ubuntu

CentOS

Full Access