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Addition ( 1 + 1 = 2 ) Subtraction ( 10 2 = 8 ) Division ( 10 / 2 = 5 ) Multiplication ( 3 * 3 = 9 ) Modulus calculates the remainder after division; this works because expr can handle integers only ( 11 % 3 = 2 )
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When working with these options, you ll see that they all work fine with the exception of the multiplication operator *. Using this operator results in a syntax error: linux: ~> expr 2 * 2 expr: syntax error
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This seems curious, but can be easily explained. The * has a special meaning for the shell, as in ls -l *. When the shell parses the command line, it interprets the * (you don t want it to do that here). To indicate that the shell shouldn t touch it, you have to escape it. Therefore, change the command as follows: expr 2 \* 2 Alternatively, you could have escaped the * with single quotes by using the following command: expr 2 '*' 2 Another way to perform some calculations is to use the internal command let. Just the fact that let is internal makes it a better solution than the external command expr: it can be loaded from memory directly and doesn t have to come all the way from your computer s hard drive. Using let, you can make your calculation and apply the result directly to a variable, as in the following example: let x="1 + 2" The result of the calculation in this example is stored in the variable x. The disadvantage of working this way is that let has no option to display the result directly as can be done when using expr. For use in a script, however, it offers excellent capabilities. Listing 7-21 shows a script in which let is used to perform calculations. Listing 7-21. Performing Calculations with let #!/bin/bash # # usage: calc $1 $2 $3 # $1 is the first number # $2 is the operator # $3 is the second number let x="$1 $2 $3" echo $x If you think that we ve now covered all methods to perform calculations in a shell script, you re wrong. Listing 7-22 shows another method that you can use. Listing 7-22. Another Way to Calculate in a Bash Shell Script #!/bin/bash # # usage: calc $1 $2 $3 # $1 is the first number # $2 is the operator # $3 is the second number x=$(($1 $2 $3)) echo $x
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You saw this construction when you read about the script that increases the value of the variable counter. Note that the double pair of parentheses can be replaced by one pair of square brackets instead, assuming that the preceding $ is present.
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Up until now, you haven t read much about the way in which the execution of commands can be made conditional. The technique for enabling this in shell scripts is known as flow control. Bash offers many options to use flow control in scripts: if: Use if to execute commands only if certain conditions were met. To customize the working of if some more, you can use else to indicate what should happen if the condition isn t met. case: Use case to work with options. This allows the user to further specify the working of the command when he runs it. for: This construction is used to run a command for a given number of items. For example, you can use for to do something for every file in a specified directory. while: Use while as long as the specified condition is met. For example, this construction can be very useful to check whether a certain host is reachable or to monitor the activity of a process. until: This is the opposite of while. Use until to run a command until a certain condition has been met. The following subsections cover flow control in more detail. Before going into these details, however, you can first read about the test command. This command is used to perform many checks to see, for example, whether a file exists or whether a variable has a value. Table 7-3 shows some of the more common test options. For a complete overview, consult its man page. Table 7-3. Common Options for the test Command
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