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Lpi 101-500 (LPIC-1 Exam 101, Part 1 of 2, version 5.0) Exam is a certification exam that tests the fundamental skills and knowledge needed to become a Linux administrator. This is the first part of the two-part LPIC-1 certification exam and version 5.0 is the latest version. 101-500 Exam is designed to test the skills and knowledge required to work with Linux operating systems.

Lpi LPIC-1 Exam 101, Part 1 of 2, version 5.0 Sample Questions (Q393-Q398):

NEW QUESTION # 393
When running the command
sed -e "s/a/b/" /tmp/file >/tmp/file
While /tmp/file contains data, why is /tmp/file empty afterwards?

A. The command sed did not match anything in that file therefore the output is empty.
B. When the shell establishes the redirection it overwrites the target file before the redirected command starts and opens it for reading.
C. The file order is incorrect. The destination file must be mentioned before the command to ensure redirection.
D. Redirection for shell commands do not work using the > character. It only works using the | character instead.

Answer: B

Explanation:
Explanation
The problem with the command
sed -e "s/a/b/" /tmp/file >/tmp/file
is that it tries to read and write from the same file, which results in overwriting the file before the command can process it. The shell sets up the redirection by opening the file /tmp/file for writing and truncating it to zero length. Then it executes the sed command, which tries to read from the same file, but finds it empty.
Therefore, the output is also empty and the file remains empty. A possible solution is to use a temporary file for the output and then rename it to the original file name. For example:
sed -e "s/a/b/" /tmp/file >/tmp/file.tmp && mv /tmp/file.tmp /tmp/file
This way, the original file is not overwritten until the sed command finishes successfully. The other options are either incorrect or not applicable. The file order is correct, the sed command does match something in the file, and the > character is valid for redirection. The | character is used for piping, not redirection. References:
* LPIC-1 Exam 101 Objectives, Topic 103: GNU and Unix Commands, 103.4 Use streams, pipes and redirects
* LPIC-1 Linux Administrator 101-500 Exam FAQ, LPIC-1 Exam 101 Objectives, GNU and Unix
* Commands (Total Weight: 25)

NEW QUESTION # 394
Which of the following commands displays the output of the foo command on the screen and also writes it to a file called /tmp/foodata?

A. foo > stdout >> /tmp/foodata
B. foo | cp /tmp/foodata
C. foo | less /tmp/foodata
D. foo | tee /tmp/foodata
E. foo > /tmp/foodata

Answer: D

NEW QUESTION # 395
What is the difference between the i and a commands of the vi editor?

A. i (independent rows) starts every new line at the first character whereas a (aligned rows) keeps the indentation of the previous line.
B. i (insert) inserts text before the current cursor position whereas a (append) inserts text after the cursor.
C. i (interactive) requires the user to explicitly switch between vi modes whereas a (automatic) switches modesautomatically.
D. i (interrupt) temporarily suspends editing of a file to the background whereas a (abort) terminates editing.

Answer: B

NEW QUESTION # 396
The sticky bit is usually set on

A. /home
B. /var/log
C. /tmp
D. log liles

Answer: C

NEW QUESTION # 397
Which file defines the network locations from where the Debian package manager downloads software packages?
/etc/dpkg/dpkg.cfg

A. /etc/apt/sources.list
B. /etc/apt/apt.conf.d
C. /etc/apt/apt.conf
D. /etc/dpkg/dselect.cfg
E.

Answer: E

NEW QUESTION # 398
......

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