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The elsels script in the next example executes the ls command to list files with two different possible options, either by size or with all file information. If the user enters an s, files are listed by size; otherwise, all file information is listed. elsels
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echo Enter s to list file sizes, echo otherwise all file information is listed. echo -n "Please enter option: " read choice if [ "$choice" = s ] then ls -s else ls -l fi echo Good-bye
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A run of the elsels script is shown here:
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$ elsels Enter s to list file sizes, otherwise all file information is listed. Please enter option: s total 2 1 monday 2 today $
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The elif structure allows you to nest if-then-else operations. The elif structure stands for "else if." With elif, you can choose between several alternatives. The first alternative is specified with the if structure, followed by other alternatives, each specified by its own elif structure. The alternative to the last elif structure is specified with an else. If the test for the first if structure fails, control will be passed to the next elif structure, and its test will be executed. If it fails, control is passed to the next elif and its test checked. This continues until a test is true. Then that elif has its commands executed and control passes out of the if structure to the next command after the fi keyword.
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The Logical Commands: && and ||
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The logical commands perform logical operations on two Linux commands. The syntax is as follows:
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command && command command || command
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In the case of the logical AND, &&, if both commands are successful, the logical command is successful. For the logical OR, ||, if either command is successful, the OR is successful and returns an exit status of 0. The logical commands allow you to use logical operations as your test command in control structures.
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case
The case structure chooses among several possible alternatives. The choice is made by comparing a value with several possible patterns. Each possible value is associated with a set of operations. If a match is found, the associated operations are performed. The case structure begins with the keyword case, an evaluation of a variable, and the keyword in. A set of patterns then follows. Each pattern is a regular expression terminated with a closing parenthesis. After the closing parenthesis, commands associated with this pattern are listed, followed by a double semicolon on a separate line, designating the end of those commands. After all the listed patterns, the keyword esac ends the case command. The syntax looks like this:
case string in pattern) commands ;; pattern) commands ;; *) default commands ;; esac
A pattern can include any shell special characters. The shell special characters are the *, [], , and |. You can specify a default pattern with a single * special character. The * special character matches on any pattern and so performs as an effective default option. If all other patterns do not match, the * will. In this way, the default option is executed if no other options are chosen. The default is optional. You do not have to put it in.
Loops: while, for-in, for
The BASH shell has a set of loop control structures that allow you to repeat Linux commands. They are the while, for-in, and for structures. Like the BASH if structure, while and until test the result of a Linux command. However, the for and for-in structures do not perform any test. They simply progress through a list of values, assigning each value in turn to a specified variable. Furthermore, the while and until structures operate like corresponding structures found in programming languages, whereas the for and for-in structures are very different. The loop control structures are listed in Table 41-4.
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