Loops

 

06. LOOPS

There are three types of loops: while, until and for. The while loop is followed by a command or an expression enclosed in square brackets, a do keyword, a block of statements, and terminated with the done keyword. As long as the expression is true, the body of statements between do and done will be executed.

The until loop is just like the while loop, except the body of the loop will be executed as long as the expression is false.

The for loop used to iterate through a list of words, processing a word and then shifting it off, to process the next word. When all words have been shifted from the list, it ends. The for loop is followed by a variable name, the in keyword, and a list of words then a block of statements, and terminates with the done keyword.

The loop control commands are break and continue.

EXAMPLE

                                                      

while command

do

block of statements

done

------------

for variable in word1 word2 word3 ...

do                                                                              

block of statements                                                                                                                            done

while [ expression ]

do

block of statements

done

until command                                                           

do

block of statements                                                    

done                                                                           

until control command

do

commands

done

 

 

07. Break Statement :

                      This command is used to jump out of the loop instantly, without waiting to get    the control command.

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