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If statements test conditions and execute commands when the condition is true. The if statement has the following general format: if [ condition ] then commands elif [ condition ] then commands else commands fi The if statements begins with if and ends with fi (if spelled backward). All three parts are not required. Only the if section is required. The elif (elseif) and the else sections are optional. Also, notice that the if section and the elif section start with then, but the else section does not. You can use more than one elif section, but only one if and else section is allowed. An if statement can be as simple as: if [ $x -eq 1 ] then echo Hello fi A more complex statement is: if [ $day = "Saturday" -o $day = "Sunday" ] then echo Sleep in elif [ $day = "Monday" ] then echo Call in sick else echo Go to work fi You can nest if statements inside of if statements, as follows: if [ $city = "Miami" ] then if [ $name = "John" ] then echo Hello John in Miami else echo Hello friend in Miami fi fi |
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