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You can control the execution of Linux commands in a shell program with control structures. Control structures allow you to repeat commands and to select certain commands over others. A control structure consists of two major components: a test and commands. If the test is successful, the commands are executed. In this way, you can use control structures to make decisions as to whether commands should be executed. There are two different kinds of control structures: loops and conditions. A loop repeats commands, whereas a condition executes a command when certain conditions are met. The BASH shell has three loop control structures: while, for, and for-in. There are two condition structures: if and case. The while and if control structures are more for general purposes, such as performing iterations and making decisions using a variety of different tests. The case and for control structures are more specialized. The case structure is a restricted form of the if condition and is often used to implement menus. The for structure is a limited type of loop. It runs through a list of values, assigning a new value to a variable with each iteration. The if and while control structures have as their test the execution of a Linux command. All Linux commands return an exit status after they have finished executing. If a command is successful, its exit status will be 0. If the command fails for any reason, its exit status will be a positive value referencing the type of failure that occurred. The if and while control structures check to see if the exit status of a Linux command is 0 or some other value. In the case of the if and while structures, if the exit status is a zero value, the command was successful and the structure continues.
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Often you may need to perform a test that compares two values. Yet the test used in control structures is a Linux command, not a relational expression. There is, however, a Linux command called test that can perform such a comparison of values. The test command will compare two values and return as its exit status a 0 if the comparison is successful. With the test command, you can compare integers, compare strings, and even perform logical operations. The command consists of the keyword test followed by the values being compared, separated by an option that specifies what kind of comparison is taking place. The option can be thought of as the operator, but is written, like other options, with a minus sign and letter codes. For example, -eq is the option that represents the equality comparison. However, there are two string operations that actually use an operator instead of an option. When you compare two strings for equality you use the equal sign, =. For inequality, you use
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!=. Table 3 lists all the options and operators used by test. The syntax for the test command is shown here:
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test value -option value test string = string
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Integer Comparisons -gt -lt -ge -le -eq -ne String Comparisons -z -n = != str Logical Operations -a -o ! File Tests -f -s -r -w -x -d -h -c -b
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Table 3: BASH: Shell Test Operators Function Greater than Less than Greater than or equal to Less than or equal to Equal Not equal Tests for empty string Tests for string value Equal strings Not-equal strings Tests to see if string is not a null string Logical AND Logical OR Logical NOT File exists and is a regular file File is not empty File is readable File can be written to, modified File is executable Filename is a directory name Filename is a symbolic link Filename references a character device Filename references a block file
In the next example, the user compares two integer values to see if they are equal. In this case, you need to use the equality option, -eq. The exit status of the test command is examined to find out the result of the test operation. The shell special variable $ holds the exit status of the most recently executed Linux command.
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