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LPI 102-500 Practice Test - Questions Answers, Page 2

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Question 11

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What is the difference between the commands test -e path and test -f path?

Question 12

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How can the existing environment variable FOOBAR be suppressed for the execution of the script./myscript only?

Question 13

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When the command echo $$ outputs 12942, what is the meaning of 12942?

Question 14

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What output will the following command produce? seq 1 5 20

Question 15

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Which of the following words is used to restrict the records that are returned from a SELECT SQL query based on a supplied criteria for the values in the records?

Question 16

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Which of the following commands lists all defined variables and functions within Bash?

Question 17

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Which of the following SQL queries counts the number of occurrences for each value of the field order_type in the table orders?

Question 18

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What is the purpose of the file /etc/profile?

Question 19

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What command displays all aliases defined in the current shell? (Specify the command without any path information)

Question 20

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Which of the following are requirements in order to run a shell script like a regular command from anywhere in the filesystem? (Choose THREE correct answers.)

Question 11

What is the difference between the commands test -e path and test -f path?

They are equivalent options with the same behaviour.

The -f option tests for a regular file. The -e option tests for an empty file.

Both options check the existence of the path. The -f option also confirms that it is a regular file.

The -f option tests for a regular file. The -e option tests for an executable file.

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Question 12

How can the existing environment variable FOOBAR be suppressed for the execution of the script./myscript only?

unset -v FOOBAR;./myscript

set -a FOOBAR="";./myscript

env -u FOOBAR./myscript

env -i FOOBAR./myscript

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Question 13

When the command echo $$ outputs 12942, what is the meaning of 12942?

It is the process ID of the echo command.

It is the process ID of the current shell.

It is the process ID of the last command executed.

It is the process ID of the last command which has been placed in the background.

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Question 14

What output will the following command produce? seq 1 5 20

161116

151015

1234

2345

5101520

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Question 15

Which of the following words is used to restrict the records that are returned from a SELECT SQL query based on a supplied criteria for the values in the records?

CASE

FROM

WHERE

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Question 16

Which of the following commands lists all defined variables and functions within Bash?

env

set

env -a

echo $ENV

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Question 17

Which of the following SQL queries counts the number of occurrences for each value of the field order_type in the table orders?

SELECT order_type,COUNT(*) FROM orders WHERE order_type=order_type;

SELECT order_type,COUNT(*) FROM orders GROUP BY order_type;

COUNT(SELECT order_type FROM orders);

SELECT COUNT(*) FROM orders ORDER BY order_type;

SELECT AUTO_COUNT FROM orders COUNT order_type;

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Question 18

What is the purpose of the file /etc/profile?

It contains the welcome message that is displayed after login.

It contains security profiles defining which users are allowed to log in.

It contains environment variables that are set when a user logs in.

It contains default application profiles for users that run an application for the first time.

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Question 19

What command displays all aliases defined in the current shell? (Specify the command without any path information)

alias, alias -p

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Question 20

Which of the following are requirements in order to run a shell script like a regular command from anywhere in the filesystem? (Choose THREE correct answers.)

The user issuing the command must be in the group script.

The script file must be found in the $PATH.

The script file must have the executable permission bit set.

The script must begin with a shebang-line (#!) that points to the correct interpreter.

The file system on which the script resides must be mounted with the option scripts.

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Total 194 questions