-*- outline -*-

* Quoting.

 * Arguments are delimited by white space, which is either a space or a tab.

 * A string surrounded by double quotation marks is interpreted as a single

   argument.

 * A double quotation mark preceded by a backslash, \", is interpreted as a

   literal double quotation mark.

 * Backslashes are interpreted literally, unless they immediately precede a

   double quotation mark.

 * If an even number of backslashes is followed by a double quotation mark,

   then one backslash (\) is placed in the argv array for every pair of

   backslashes (\\), and the double quotation mark (") is interpreted as a

   string delimiter.

 * If an odd number of backslashes is followed by a double quotation mark,

   then one backslash (\) is placed in the argv array for every pair of

   backslashes (\\) and the double quotation mark is interpreted as an escape

   sequence by the remaining backslash, causing a literal double quotation

   mark (") to be placed in argv.

 * In double quote mark need surround such chars:

     & < > [ ] { } ^ = ; ! ' + , ` ~ %

   Also all this char can be escaped by ^ char.

 * Long line can be truncated by ^ char, in this case trailing white spaces

   not allowed.

 * To quote percent sign % before alpha char in batch file double it

   occurrences or plase in quotes:

     prog '%'HOME'%' "%"HOME"%" %%HOME%

  http://msdn.microsoft.com/en-us/library/ms880421.aspx

                Parsing C Command-Line Arguments

* Variables.

Variable name start with letter and underscore, next chars can be letter,

number and underscore. Variable name is case insensitive.

** List of variables.

  cmd> set

...

VAR=VALUE

** Getting.

Write %VAR% in place where you want insert variable VAr value.

** Setting.

  cmd> set /p VAR=VALUE

VAR is variable name, VALUE is value.

** Deleting.

  cmd> set VAR=

VAR is variable name.

** Input from user.

  cmd> set /p VAR=PROMPT

VAR is variable name, PROMPT is displayed prompt.

** Input from file.

  cmd> set /p VAR=<FILE

VAR is variable name, FILE is file name. Sfter executing VAR contain first

line from FILE.

* CMD tricks.

  $ set /p TOOLOUTPUT= < temp.txt

  $ for /f "tokens=*" %%i in ('%~dp0sometool.exe') do set TOOLOUTPUT=%%i

  $ for /f "tokens=1 delims=" %%s in (users.txt) do (echo %%S & command "%%S") >> outputfile.txt

* Limits.

Variable value and one line command string after expansion can not exceed 8191

characters for Windows XP and later and 2047 for Windows NT, Windows 2000.

  http://support.microsoft.com/default.aspx?scid=kb;en-us;830473

                Command prompt (Cmd. exe) command-line string limitation