Lpi 102-500 LPI Level 1 Online Training

Question #21

Which of the following configuration files should be modified to set default shell variables for all users?

A . /etc/bashrc
B . /etc/profile
C . ~/.bash_profile
D . /etc/.bashrc

Correct Answer: B
B

Explanation:

The /etc/profile file is a configuration file that is read by the Bash shell when a user logs in. It contains commands and settings that apply to all users of the system, such as environment variables, PATH information, terminal settings, and security commands. Environment variables are variables that affect the behavior of programs and processes. For example, the PATH variable defines the directories where the shell looks for executable files, and the JAVA_HOME variable defines the location of the Java installation. The /etc/profile file can also source other files from the /etc/profile.d/ directory, which can contain additional scripts for setting environment variables or other system-wide settings. The /etc/profile file is the best option for setting default shell variables for all users, as it is executed before any user-specific files. The other options are not suitable for this purpose, because:

/etc/bashrc is a configuration file that is read by the Bash shell when it is started as an interactive non-login shell. It contains commands and settings that apply to all interactive shells of the system, such as aliases, functions, and prompt settings. It is not executed when the shell is started as a login shell, which is the case when a user logs in. Therefore, it is not a good place to set default shell variables for all users.

~/.bash_profile is a configuration file that is read by the Bash shell when it is started as a login shell for a specific user. It contains commands and settings that apply only to that user, such as environment variables, PATH information, and startup programs. It can also source other files, such as ~/.bashrc, which is read by the shell when it is started as an interactive non-login shell for that user. It is not a good place to set default shell variables for all users, as it only affects the user who owns the file.

/etc/.bashrc is not a valid configuration file for the Bash shell. The dot (.) at the beginning of the file name indicates that it is a hidden file, which means that it is not visible by default in the file system. The Bash shell does not look for this file when it is started, and it does not execute any commands or settings from it. Therefore, it is not a good place to set default shell variables for all users.

Reference: 1 2

Question #22

Which of the following is the best way to list all defined shell variables?

A . env
B . set
C . env -a
D . echo $ENV

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Question #23

Which command allows you to make a shell variable visible to subshells?

A . export $VARIABLE
B . export VARIABLE
C . set $VARIABLE
D . set VARIABLE
E . env VARIABLE

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Question #24

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

A . LIMIT
B . FROM
C . WHERE
D . IF

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Question #25

What benefit does an alias in bash provide?

A . It provides faster lookups for commands in the system directory.
B . It creates a local copy of a file from another directory.
C . It hides what command you are running from others.
D . It allows a string to be substituted for the first word of a simple command.

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Question #25

What benefit does an alias in bash provide?

A . It provides faster lookups for commands in the system directory.
B . It creates a local copy of a file from another directory.
C . It hides what command you are running from others.
D . It allows a string to be substituted for the first word of a simple command.

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Question #27

You are looking into a new script you received from your senior administrator. In the very first line you notice a #! followed by a file path. This indicates that:

A . The file at that location was used to make the script.
B . This script provides identical functionality as the file at that location.
C . This script will self-extract into a file at that location.
D . The program at that location will be used to process the script.

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Question #28

What keyword is missing from this code sample of a shell script?

____ i in *.txt; do

echo $i

done

A . for
B . loop
C . until
D . while

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Question #29

What word is missing from the following SQL statement?

__________ count(*) from tablename;

(Please specify the missing word using lower-case letters only.)

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Question #30

Which file used by XDM specifies the default wallpaper?

A . /etc/X11/xdm/Xsetup
B . /etc/X11/xdm.conf
C . /etc/X11/xdm/Defaults
D . /etc/X11/defaults.conf

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