FOR %%VV IN (1 2 3) DO ECHO %%VV, why single V always?

[nnnmmm]

FOR %%VV IN (1 2 3) DO ECHO %%VV

why cant you have double V as a variable, why single always? what do call this kind of variable?

what if you run out of variables?

[ShadowThief]

why cant you have double V as a variable, why single always?

Because that's how Microsoft decided to do it.

what do call this kind of variable?

A for loop variable. You may also see it called a for loop parameter or a token.

what if you run out of variables?

Then you seriously need to re-evaluate how you're parsing the data. Also, you aren't limited to letters; you can use almost any of the 128 basic ASCII characters.

[penpen]

You could use "enough" for-variables.

Key idea accessing huge amounts of for-variable names:
http://www.dostips.com/forum/viewtopic.php?p=51537#p51537.

List of characters that could be used as a for-variable name (in hexadecimal):
http://www.dostips.com/forum/viewtopic.php?p=51622#p51622.
(see Point 4)

You also could use many tokens simultaniously:
http://www.dostips.com/forum/viewtopic.php?p=51595#p51595.


penpen

[Squashman]

Please read the documentation for a command before you ask questions.

The help file for the FOR command is quite clear. All you had to do was read the first 3 lines of the help file for the FOR command.

Code: Select all

H:\>for /?
Runs a specified command for each file in a set of files.

FOR %variable IN (set) DO command [command-parameters]

  %variable  Specifies a single letter replaceable parameter.

Single does not equal double.

[nnnmmm]

sorry about the question,
i just had to ask that once in my life as to what experts think about it.