Chapter 11. Advanced Shell Programming
Chapter Syllabus
11.1 Arithmetic and Logic Operations
11.2 The while-do-done Loop
11.3 The until-do-done Loop
11.4 The for-do-done Loop
11.5 Breaking a Loop
11.6 Text Processing
Loops are used to perform an operation repeatedly until a condition becomes true or false. The test or let command is used to check the condition every time a repetition is made. All loop structures used in shell programming start with a keyword. The block of commands that is executed repeatedly is enclosed by the do-done keywords.
There are three basic types of loops. The first one is the for-do-done loop, which is used to execute a block of commands for a fixed number of times. The while-do-done loop checks for a condition and goes on executing ...
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