cmd第五章（CMD fifth chapters）.docVIP

cmd第五章（CMD fifth chapters） The fifth chapter, set command detailed explanation In the last paste, a brief introduction to the SET set the role of custom variables, and now specifically to talk about other functions of set First, set the custom variables with the set command Display, set, or delete cmd.exe environment variables. SET [variable]=[string] variable specifies the environment variable name. String specifies a series of strings to assign to variables. To display the current environment variable, type the SET with no arguments. The SET command does not allow a variable name to contain an equal sign. Note: the following usage clears the value of the variable variable to make it undefined. SET variable= There is no sign behind the equal sign. If it is written as SET variable=, the variable value is not empty, but equals two quotation marks Example: @echo off Set var=, Im worth it Echo%var% Pause See set var=. Im a value, and thats how BAT sets variables directly in batch processing! Set is the command, VaR is the variable name = number, the right I am the value is the value of the variable In the batch we will refer to this is the variable name with two var% (percent) expansion, such as%var% SET also provides an interactive interface, allowing users to enter their own values, then we according to this value to do the operation, the grammar I would say that SET now, only need to add a /P parameter can be! SET /P variable=[promptString] Example: @echo off Set /p var=, enter the value of a variable: The echo you entered%var% ~_~ Pause Set /p is command syntax. VaR is the variable name = the right of the number enter the variable value: this is the prompt, not the value of the variable.! After the operation, we prompt behind direct input 1, will display a row you enter 1 ~_~ Now talk about other functions of SET Using set / view the help of SET, we found SET in addition to what I said above SET, [variable=[string]]SET, /P, variable=[promptString], these two gramma