Job No. 9-13

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1,Shell operation principle:

/bin/bash the location of the Command (program) for the shell, #! /bin/shell for The program call under Bin!

is to put the order in bulk finger line!

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2.variables, syntax,

variable: The amount that can be changed (variable name, memory address pointer , memory data)!

declaring variables: Username=fengzi

variable invocation:$Username

statements:if,while,for,case,until ( superfluous )!

how to use and C Not much difference can have too much not much, after the implementation of the demo!

function:

Disclaimer:function Wang ()

{}

or Wang () {}

Call:Wang

4 , define a variable, determine if the document exists, do not exist, create @ ! Some words file output document properties!

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5 , reading variables, and comparing them If ... else : language! No input is available for null and numeric judgment!

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6、。。。。。 Try to reach three ways not ...!

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Output Result:

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Job No. 9-13