What is meaning of - and + in launch command?

[L]

Can someone explain pls

[Cathulhu]

Usually it's:

+ = Do this.
- = Don't do this.

But can also mean when only - is available to do this.
Depends on the game.

[ReBoot]

Really REALLY depends on the game. For GoldSrc/Source engine games (also tends to stand true for ID engine), - denotes a launch parameter while + denotes an in-engine parameter passed via command line (instead of console or config file).

[L]

Originally posted by ReBoot:

Really REALLY depends on the game. For GoldSrc/Source engine games (also tends to stand true for ID engine), - denotes a launch parameter while + denotes an in-engine parameter passed via command line (instead of console or config file).

Oh nice

[L]

Originally posted by Cathulhu:

Usually it's:

+ = Do this.
- = Don't do this.

But can also mean when only - is available to do this.
Depends on the game.

Okay :)

[Elucidator]

In java its exact
it gets vague with games as others said, as well with steam, but depends on the function.

steam.exe -console for example =
"do not hide the console" or "display the console"
-login (name) (pass)
"do not ask for login details, instead use these"
-log_voice
"do not ignore voice when logging" or "enable logging of voice"
-nofriendsui
This one is vague, due to - and no in the word, but the default is displaying... e.e;
"do not open steam friends and chat upon loading steam"

especially with that last example, you can see that they don't really standardize.

As for java
+XX:option_name enables the option
-XX:option_name disables it
also the names make sense towards the option.... usually.

[cinedine]

Originally posted by Elucidator:

This one is vague, due to - and no in the word

Not really. The other ones you all have jumped through hoops to follow your logic. Since you mentioned Java, you should also be familiar with the practice of "say what you do, not what you don't". For example getters for boolean are alway isSomething and should never be isSomethingNot.

Anyway, the hyphen is just used traditionally as a seperator for arguments. You should be perfectly able to chain the commands without a space.

[[N]ebsun]

Depends on the game / application, they can parse command line parameters any way they like.