The while loop in Shell
the while loop gives you the ability to execute a set of repetitive commands until certain conditions occur. it is often used when you need to manipulate iterative variable
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For loop in Shell
the for loop works on lists of items (items). it repeats a set of commands for each item in a list.
Until loop in Shell
the while loop is perfect for the situation where you want to execute a set of commands while some conditions are true. sometimes you need to execute a set of commands until a
Select loop in Shell
the select loop provides an easy way to create a numbered menu from which the user can select. it is useful when you want to ask the user to select one or more items from a list