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In this exercise, you will practice creating a basic shell script This script will ask the user for a series of three numbers It will then ask the user if he or she wants to sum the three numbers or average them You will also add the execute permission to the file to allow the file owner to run it Complete the following: 1 If necessary, boot your Linux system and log in as a standard user If you used the lab exercise in 3 to install your system, you can log in as tux with a password of M3linux273 2 Change to the ~/bin directory 3 At the shell prompt enter vi ~/domath 4 Enter the following script:
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#!/bin/bash #A script to do some simple math clear declare -i A declare -i B declare -i C declare -i ANSWER echo "Enter the first number:" read A echo "Enter the second number:" read B echo "Enter the third number:" read C echo "What would you like to do with these numbers " echo "P: Add them up!" echo "V: Average them!"
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echo "Enter your choice:" read CHOICE case $CHOICE in p | P ) ANSWER=A+B+C ;; v | V ) ANSWER=A+B+C ANSWER=$ANSWER/3 ;; esac echo "Your answer is" $ANSWER "" exit 0
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5 Save your changes to the script and exit vi 6 Make the script executable by the file owner by entering chmod u+x /domath at the shell prompt 7 Test the script by entering domath at the shell prompt 8 Test the script and verify that it works You are now an experienced bash shell user! Let s review what you learned in this chapter
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In this chapter, you learned about working with the bash shell on your Linux system Because the Linux+ exam has a heavy emphasis on command-line utilities, you need to be very familiar with the bash shell We began by discussing bash configuration files We pointed out that there are two types of shells on a Linux system:
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When running a login shell, /etc/profile is read first to initially configure the shell environment The shell then searches for the following files in the user s home directory in the following order:
bash_profile bash_login profile
9: Using the Linux Shell
The shell will read the first of these files found and use it to configure the shell environment for the current user Different distributions will use different bash configuration files We then discussed the command history function of the bash shell Using command history, you can press the key to scroll through a list of previously entered commands These commands are saved in the bash_history file in each user s home directory The bash shell also offers command completion Using command completion, you can enter part of a command and then press the key to automatically finish the command for you At this point in the chapter, we then turned to a discussion of environment variables Environment variables are used to configure the shell environment These variables are automatically populated when the bash shell is started, but you can modify many of them if needed You can view the value of an environment variable using the following utilities:
echo set env
To set the value of a variable, you can enter variable_name=value For example, to add the /var/opt directory to the value of the PATH environment variable, you can enter PATH=$PATH:/var/opt at the shell prompt This assigns the current value of the PATH variable ($PATH) concatenated with :/var/opt to PATH After assigning a new value to an environment variable, you need to enter export variable_name at the shell prompt to make the new value available to other shells, including subshells launched by the current shell It s important to remember that any change you make to an environment variable is not persistent To make it persistent, you need to edit one of the bash configuration files discussed in this chapter to make the value assignment to the variable each time a shell is started We also pointed out that you can create your own variables from the shell prompt This is done using the same technique as described for environment variables Like environment variables, user-defined variables have to be exported in order for them to be available to other shells We then turned our discussion to a special type of variable called an alias An alias is a shortcut to commands on your Linux system Many aliases are usually defined automatically when a shell is started by most distributions You can view these using the alias command You can also define your own aliases by entering alias alias_name= commands at the shell prompt Like variables, alias definitions
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