Linux+ LX0-104 domain 5

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586085

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All users at your site are using the Bash shell. You want to set a variable that will apply to every user and always have the same value. Which file would you place this variable in?

Select the correct answer(s).

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Explanation

The values in /etc/profile are set for every user. After that file has been accessed, the login routine then takes the user into the user's home directory and looks for each of the three other user specific files: .bash_profile, .bash_login, and .bashrc.

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A user is requesting that each time she logs in, a particular entry be written to a log file. This will only apply to her and she is using the Bash shell. In which configuration file would you make an entry for this action to take place?

Select the correct answer(s).

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Explanation

The .profile file exists within the user's home directory and is executed upon each login. Placing the entry here will allow this action to take place only for this user, while placing it in /etc/profile would make it applicable for all users. The .bashrc file is used to pass variables between shells and would not run only when a login takes place.

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Which of the following files would you use to create aliases that are applied when a specific user starts a BASH session? (Select two.)

Select the correct answer(s).

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Explanation

You could use either ~/.bashrc or ~/.profile. ~/.bashrc stores shell preferences for individual users. ~/.profile stores configuration preferences similar to /etc/profile, but for individual users. /etc/profile stores system-wide configuration commands and is used primarily to set environment variables ~/.bash_logout stores commands that execute when a user logs out.

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After a user starts a BASH session and the scripts in /etc/profile are applied, what is the next file that could affect the shell session?

Select the correct answer(s).

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Explanation

Login shells execute the configuration scripts they use in the following order: 1. /etc/profile 2. ~/.bash_profile (If this file is found, the shell does not look for additional configuration script files) 3. ~/.bash_login (If this file is found, the shell does not look for additional configuration script files) 4. ~/.profile (This file only executes in the absence of the preceding two)

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Your default target on your Linux system is set to multi-user mode; however, you want the X Windows System to launch when you log into the system. Which file should you edit?

Select the correct answer(s).

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Explanation

In this scenario, you should edit ~/.bash_login . ~/.bash_login stores commands that execute when a user logs in. ~/.profile stores configuration preferences primarily to set environment variables for individual users. ~/.bash_logout stores commands that execute when a user logs out. ~/.bash_log does not exist.

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Which of the following commands will create a shortcut to the tail -f /var/log/messages command?

Select the correct answer(s).

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Explanation

alias sysmesg="tail -f /var/log/messages" creates an alias named sysmesg . An alias is a custom command that performs a specific action. In this example, when the user types sysmesg at the command prompt, the tail -f /var/log/messages command will execute. All other options are incorrect and will not create the shortcut, but instead will return an error. Use export to export a user-defined variable to make it available to child sessions. Use env to display the values for environment variables applied to child sessions.

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You need to set the COMP variable to the value 1745. Which command will set the variable so it is available to other shell programs?

Select the correct answer(s).

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Explanation

Use the export COMP=1745 command to set the variable. The set command will not work, nor will simply typing COMP=1745 . The set command simply sets a variable to a value while the export command makes the variable available for other shell programs.

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Two users should have identical settings, yet one is having problems with the display on his screen and you suspect there is a difference in their environment variables. Which command will display all the environment variables?

Select the correct answer(s).

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Explanation

Use the env utility to display a list of all the environment variables and their values.

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Which of the following statements best describes the PATH environment variable?

Select the correct answer(s).

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Explanation

The PATH environment variable contains the directory prefixes used to search for programs and files. Use a colon to separate entries in the PATH variable. HISTFILE specifies the filename where past commands are stored. PS1 specifies the characters the shell uses to indicate normal user ($), root user (#) and similar items. PWD contains the path of the current working directory.

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You want the directory /sbin/special to always be a part of the PATH. You also want to keep all the current entries in your PATH statement. Which of the following commands would you use?

Select the correct answer(s).

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Explanation

A colon separates entries in the PATH statement, so one must be added to the end of the existing PATH ($PATH), and then the new directory specification appended. Using the absolute path, /sbin/special, identify the path to the directory you want to add.

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Which command will display a list of the currently defined aliases on the system?

Fill in the blanks

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Explanation

Entering the alias command at the shell prompt will display a list of the currently defined aliases on the system.

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What commonly predefined alias is configured to run the ls -l command?

Fill in the blanks

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Explanation

The ll command is actually a commonly predefined alias that runs the ls -l command--to list the contents of a directory in long form.

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You must do which of the following to define a persistent alias?

Select the correct answer(s).

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Explanation

To make an alias persistent you would add the command defining the alias to the appropriate shell configuration file. The name of the shell configuration file varies across Linux distributions. For example, in the Fedora distribution, the shell configuration file is the .bashrc hidden file, found in each user's home directory.

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The user mbrown has a directory named logs in her home directory that is regularly updated with new log files when certain system events occur. She runs the following commands several times a week to check this directory: • cd /home/mbrown/logs • ls -al She wants a persistent alias named logcheck to be created to run these two commands. What command would you enter into her shell configuration file to create this persistent alias?

Fill in the blanks

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Explanation

The user mbrown would enter the following command in her shell configuration file: alias logcheck="cd /home/mbrown/logs;ls -al" The two commands need to be inside quotes and separated by a semi-colon (;).

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What is the full path to the directory that contains a set of configuration file templates that are copied into a new user's home directory when it is created?

Fill in the blanks

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Explanation

The /etc/skel directory contains a set of configuration file templates that are copied into a new user's home directory when it is created, including the following files: • .bashrc • .bash_logout • .bash_profile • .kshrc

Linux+ LX0-104 domain 5

Question 1 of 1

Time Left

All users at your site are using the Bash shell. You want to set a variable that will apply to every user and always have the same value. Which file would you place this variable in?

Select the correct answer(s).

(0/0)

Explanation

A user is requesting that each time she logs in, a particular entry be written to a log file. This will only apply to her and she is using the Bash shell. In which configuration file would you make an entry for this action to take place?

Select the correct answer(s).

(0/0)

Explanation

Which of the following files would you use to create aliases that are applied when a specific user starts a BASH session? (Select two.)

Select the correct answer(s).

(0/0)

Explanation

After a user starts a BASH session and the scripts in /etc/profile are applied, what is the next file that could affect the shell session?

Select the correct answer(s).

(0/0)

Explanation

Your default target on your Linux system is set to multi-user mode; however, you want the X Windows System to launch when you log into the system. Which file should you edit?

Select the correct answer(s).

(0/0)

Explanation

Which of the following commands will create a shortcut to the tail -f /var/log/messages command?

Select the correct answer(s).

(0/0)

Explanation

You need to set the COMP variable to the value 1745. Which command will set the variable so it is available to other shell programs?

Select the correct answer(s).

(0/0)

Explanation

Two users should have identical settings, yet one is having problems with the display on his screen and you suspect there is a difference in their environment variables. Which command will display all the environment variables?

Select the correct answer(s).

(0/0)

Explanation

Which of the following statements best describes the PATH environment variable?

Select the correct answer(s).

(0/0)

Explanation

You want the directory /sbin/special to always be a part of the PATH. You also want to keep all the current entries in your PATH statement. Which of the following commands would you use?

Select the correct answer(s).

(0/0)

Explanation

Which command will display a list of the currently defined aliases on the system?

Fill in the blanks

(0/0)

Explanation

What commonly predefined alias is configured to run the ls -l command?

Fill in the blanks

(0/0)

Explanation

You must do which of the following to define a persistent alias?

Select the correct answer(s).

(0/0)

Explanation

Fill in the blanks

(0/0)

Explanation

What is the full path to the directory that contains a set of configuration file templates that are copied into a new user's home directory when it is created?

Fill in the blanks

(0/0)

Explanation

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