1) the command is ordered to distinguish case and case character in the Linux editor. 2) add the necessary comments in the Shell statement, so as to facilitate the inquiry and maintenance, comments to # beginning. 3) when the Shell variable is numeric, use the multiplicative symbol "*" to use the escape character "\" to escape. 4) because Shell does not handle any redundant spaces in commands, programmers can use this feature to adjust program indentation to enhance program readability. 5) in the name of a function, it is best to use a name that is meaningful and easy to understand, even if the function name can express the tasks completed by the function more accurately. It is also suggested that a function name and a variable name control table should be established for a larger program.

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