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Instead of using the keyword test for the test command, you can use enclosing brackets. The command test $greeting = "hi" can be written as
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$ [ $greeting = "hi" ]
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Similarly, the test command test $num -eq 10 can be written as
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$ [ $num -eq 10 ]
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The brackets themselves must be surrounded by white space: a space, TAB, or ENTER. Without the spaces, it would be invalid. The test command is used extensively as the Linux command in the test component of control structures. Be sure to keep in mind the different options used for strings and integers. Do not confuse string comparisons and integer comparisons. To compare two strings for equality, you use =; to compare two integers, you use the option -eq.
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Conditions: if, if-else, elif, case
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The BASH shell has a set of conditional control structures that allow you to choose what Linux commands to execute. Many of these are similar to conditional control structures found in programming languages, but there are some differences. The if condition tests the success of a Linux command, not an expression. Furthermore, the end of an if-then command must be indicated with the keyword fi, and the end of a case command is indicated with the keyword esac. The condition control structures are listed in Table 4. Table 4: BASH: Shell Control Structures Condition Control Structures: Function if, else, elif, case if command then command fi if command then command else command fi if command then command elif command then command else command fi case string in pattern) command;; if executes an action if its test command is true.
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if-else executes an action if the exit status of its test command is true; if false, then the else action is executed.
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elif allows you to nest if structures, enabling selection among several alternatives; at the first true if structure, its commands are executed and control leaves the entire elif structure.
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case matches the string value to any of several patterns; if a pattern is matched, its associated commands are executed.
Table 4: BASH: Shell Control Structures Condition Control Structures: Function if, else, elif, case esac command && command The logical AND condition returns a true 0 value if both commands return a true 0 value; if one returns a nonzero value, then the AND condition is false and also returns a nonzero value. The logical OR condition returns a true 0 value if one or the other command returns a true 0 value; if both commands return a nonzero value, then the OR condition is false and also returns a nonzero value. The logical NOT condition inverts the return value of the command.
command || command
! command Loop Control Structures: while, until, for, for-in, select while command do command done until command do command done for variable in list-values do command done for variable do command done Loop Control Structures: while, until, for, for-in, select (continued) select string in item-list do command done
while executes an action as long as its test command is true.
until executes an action as long as its test command is false.
for-in is designed for use with lists of values; the variable operand is consecutively assigned the values in the list. for is designed for reference script arguments; the variable operand is consecutively assigned each argument value.
select creates a menu based on the items in the itemlist; then it executes the command; the command is usually a case.
if-then
The if structure places a condition on commands. That condition is the exit status of a specific Linux command. If a command is successful, returning an exit status of 0, then the commands within the if structure are executed. If the exit status is anything other than 0, the command has failed and the commands within the if structure are not executed.
The if command begins with the keyword if and is followed by a Linux command whose exit condition will be evaluated. This command is always executed. After the command, the keyword then goes on a line by itself. Any set of commands may then follow. The keyword fi ends the command. Often, you need to choose between two alternatives based on whether or not a Linux command is successful. The else keyword allows an if structure to choose between two alternatives. If the Linux command is successful, those commands following the then keyword are executed. If the Linux command fails, those commands following the else keyword are executed. The syntax for the if-then-else command is shown here:
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