The '''COMMAND$''' function returns the DOS commandline arguments passed when a program is run.



''Syntax:'' variable$ = COMMAND$


* The [[STRING|string]] return value is any parameter following the filename in a [[RUN]] or command line statement.
* Qbasic returns [[UCASE$|uppercase]] [[STRING]] parameters no matter what case they were sent originally. 
* '''QB64''' does not '''require or return all [[UCASE$|uppercase]]''' values so keep that fact in mind when checking parameters passed!
* Useful when the programmer wants to add options to the command line of a program for later use by another program.
* COMMAND$ was not available in QuickBasic versions below 4.0


''Example:'' Compile both programs. ProgramA [[RUN]]s ProgramB with a parameter passed following the filename: 
{{CodeStart}}
{{Cl|LOCATE}} 12, 36: {{Cl|PRINT}} "ProgramA"

{{Cl|LOCATE}} 23, 25: {{Cl|PRINT}} "Press any key to run ProgramB"
K$ = {{Cl|INPUT$}}(1)
{{Cl|RUN}} "ProgramB FS"  'pass FS parameter to ProgramB in QB64

{{Cl|END}}
{{CodeEnd}}
: ''ProgramB'' checks for fullscreen parameter pass in QB64 and goes full screen. 
{{CodeStart}} '' ''
{{Cl|LOCATE}} 12, 36: {{Cl|PRINT}} "ProgramB"
parameter$ = {{Cl|UCASE$}}({{Cl|COMMAND$}})
{{Cl|LOCATE}} 20, 33: {{Cl|PRINT}} "Parameter = " + parameter$
{{Cl|IF...THEN|IF}} {{Cl|LEFT$}}(parameter$, 2) = "FS" {{Cl|THEN}} {{Cl|_FULLSCREEN}} 'parameter changes to full screen

{{Cl|END}} '' ''
{{CodeEnd}}
{{OutputStart}}                              Parameter = FS.EXE
{{OutputEnd}}



''See also:'' 

* [[SHELL]], [[RUN]]

* [[UCASE$]], [[LCASE$]]



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