* Batch command line common operation

To do occasional automation needs,
past each write batch files are now checked.
Today the batch common operations used to be a record.

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• 1. calls and parameter passing batch file

  a.bat

  ./b.bat Hello Wrold
  
  REM 或
  REM call b.bat Hello Wrold

  b.bat

  set param1=%1
  set param2=%2
  echo %param1%
  echo %param2%

  The above were shot Helloand World.

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Note: The
above command set, there are no spaces around the equal sign

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• 2. string concatenation interception

  b.bat

  set greeting=%param1%-%param2%
  echo %greeting%

  Above will output: Hello-World

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• 3. string interception

  Interception command format

  SomeText:~FromIndex:Count

  Example taken:

  set name=CoderMonkey
  echo %name:~0,4%

  Above will output:Code

  NOTE: intercept may be reversed (FromIndex <0)

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• 4. Alternatively string

  Replace command format

  SomeText:source=target

  Replace the sample:

  set name=CoderMonkey
  echo %name:Monkey=Gorilla%

  Above will output:CoderGorilla

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Note:
  when there are spaces in the string, you need to add quotation marks
  without a space, then do not add quotes

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• The common variable

  %cd%        current directory，当前目录
  %date%     日期
  %time%     时刻，包含毫秒

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• 6. Create and delete folders

  mkdir "foldername"

  Create a folder

  rmdir "folder_path"

  Delete the specified folder

  rmdir /s /q "folder_path"

  /sMeans to delete the specified directory and its subdirectories and files in the
  /qrepresentation silent treatment, do not ask

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• 7. Output files, such as log log

  echo "【要输出的文字信息，比如当前日期时刻】%date% %time%" > log.txt

  The date will appear as: 2019/12/17format,
  time will output:13:58:28.24

  If you want the date and time as a log file name,
  because the /heel :are non-character file name is used,
  here we use the Replace function mentioned above.

  Example:

  REM 将`/`跟`:`替换为空
  set logfilename=%date:/=%_%time::=_%.txt
  echo "%date% %time%Log信息" > "%logfilename%"

  Here's log file is generated in the path of the current execution.
  Needs to be generated in the specified path, then the log file name with full path to