批处理批处理for的变量下（Batch for variables）

批处理for的变量下Batch for variables

Batch: FOR variables (originality)

(two) extended variables

Extended variables can enhance the FOR command. Here is a copyof the official help file.

The replacement of the FOR variable reference has been enhanced.You can now use the following options syntax:

~I - delete any quotes (") . Expand%I

%%~fI - extends%I to a fully qualified path name (full pathn ame)

Only%%~dI - expands%I to a drive letter (letter display only)%%~pI - extends the%I to only one path (only the path isextracted)

%%~nI-extends the%I to only one file name (only the file name)%%~xI - extends the%I to only one file extension (extractingonly the suffix format)

The%%~sI - extended path contains only short names (longf ilenames are reduced)

%%~aI - extends%I to the file properties of the file (a readonly, H hide)

%%~tI - extends%I to the date / time of the file (creation,modification time)

%%~zI - extends%I to the size of the file (KB)

%%~$PATH:I - finds the column in the directory of the pathenvironment variable and extends the%I to the first fullyqualified name found. If the environment variable name is notdefined, or the file is not found, the composite key is expandedto an empty string.

You can combine modifiers to get multiple results:

%%~dpI - extends%I to a drive letter and path only

%%~nxI - extends%I to only one file name and extension%%~fsI - extends only%I to a full pathname with a short name%%~dp$PATH:i - finds the column in the directory of the pathenvironment variable, and extends the%I to the first driveletter and path found.

%%~ftzaI - extend%I to DIR similar to the output lineIn the examples above,%%I and PATH can be replaced by othervalid values. %%~ grammar with a valid variable name FORtermination. Selecting uppercase variable names like%%I iseasier to read and avoid confusing combinations of keys thatare not case sensitive.

When using the FOR command in a batch file, specify variablesusing%%variable instead of%variable. Variable names are casesensitive, so%i is different from%I. At the same time, no morethan 52 are in use.

Many people do not understand the FOR command for officialdocument translation too be beneath the human character. Hereyou just catch the use of the above eleven expansion variables,and the specific role, and so you used, and then check it.1, the use of the option ~I

Example: observe double quotes.

Create text. Delete quote.Txt":

"What' s your name"

"The last name is Zhu, and the name is" Liye ""

"Pig upright leaves?""

"Uh huh!"

"How old is this year?""

"16. "

"January 15, 2009. ""

Ba "____" Ch

"1+1" =?"

''

Code

@echo off

FOR, /F, delims=,%%i, IN (delete quote.Txt) , DO, echo,%%~iPause

Operation result:

1) double quotes in Chinese, none of them disappear. Proof thatit is not valid for double quotation marks in chinese. Such as"16". "

2) the external state of the double quotes English deleted (5to dangerous curtain curtain good song Lai chip H? /span> "1+1""

3) single quotes in English status have not been deleted. Such

Explain:

This command is suitable for extracting strings from otherplaces and deleting the most enclosed double quotes in the

string for other commands. Look at the following example:@echo off

For%%a in ("great Chinese people hooray, hooray, ten millionyears old") do echo.%%~a

Pause>nul

Operation result:

Long live the great Chinese people! Hooray!

Explain:

If you do not use double quotes, you will display them insections. Double quotation marks using Chinese status, withdouble quotation marks. But the double quotation marks ("" """") in English states are very clean.

2, the use of other options

Example: only the file name is checked:

@echo off

For%%i in do echo%%~ni (. *)

Pause>nul

Explain:

%%~ni can extract file names, and using this command to extractsongs from your computer will be the best choice.

Cases:

View date size file name:

@echo off

For%%i in do echo%%~ztni (. *)

Pause>nul

Explain:

Sometimes you want to look at the date, size, property, etc.of a file, and you can use the add in variables together.This might be useful in antivirus.

Although the expansion variables are many, but the usage isbasically the same, they can be replaced by other extendedvariables instead of%%~ni.

Note that the last letter I of the variable is not fixed, whatis the input variable, and what it should be.

For example, using%%~$PATH:I:

@echo off

For /r%%a in do echo%%~$PATH:a (. *)

Pause>nul

Explain:

The first%%a uses a, then the second%%a is still using a, anddoes not change because of the addition of the extended variable~$PATH. Can not be born hard move formula, all use I.Extended environment variables are often used to extract keycharacters, or to exclude other redundant factors.

(three) system variables

(temporarily omitted)

Third section FOR DO

I. overview

DO followed by one or a set of commands. A command that indicatesthe execution of each FOR cycle.

Sometimes the commands behind DO are too complex and need tobe bracketed together to represent a whole.

Two, type

1, an order:

For,%%i, in (. . . , o*.mp3) , do, echo,%%i

2, a set of commands:

For, /r, d: ,%%i, in (QQ.exe) , do, if, exist,%%i, , start,%%i1, need brackets:

@echo off

Color 0A

For, /l,%%a, in (1,2,8) do

For, /l,%%b, in (3, 3, 18) do

For, /l,%%c, in (100, -15,30) do

Echo%%a%%b%%c

)

)

)

Pause

Three, use

(omitted) see the fifth section of the FOR command synthesisapplication