Solve : dashes in batch file?

1.	Solve : dashes in batch file?
Answer» Hello, can anyone explain me what these dashes means and do in this line from batch file? if -%1 == - GOTO error1 :error1 ECHO please write file name When I write only batch file name in prompt line (WINDOWS Vista) without any other file and run it, I GET the message 'please write file name'. I would like to know how these dashes work and where can I use it.The dash is so you can test for a blank parameter. You COULD use any character. Often PEOPLE use quotes before and after, or whatever. if [%1==[ echo parameter is blank if "%1"=="" echo parameter is blank if $%1$==$$ echo paramter is blank if cat%1==cat echo parameter is blank Thank you for timeliness. Really helped me ))

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