how to put history=0 in command prompt

[sylas]

Hi all! I have about 100 commands possible in command prompt. Most of them are repeated. "history" alone shows these possible commands. But impossible to delete them. Here my error messages;

Error:
                                                                                                           
C:\Users\Sylvain                                                                                           
λ reset history                                                                                            
      1 [main] reset 8760 cygwin_exception::open_stackdumpfile: Dumping stack trace to reset.exe.stackdump 
                                                                                                           
C:\Users\Sylvain                                                                                           
λ set history                                                                                              
Environment variable history not defined                                                                   
                                                                                                           
C:\Users\Sylvain                                                                                           
λ history=0                                                                                                
'history' is not recognized as an internal or external command,                                            
operable program or batch file.                                                                            
                                                                                                           
C:\Users\Sylvain                                                                                           
λ set history                                                                                              
Environment variable history not defined                                                                   
                                                                                                           
C:\Users\Sylvain                                                                                           
λ history=0                                                                                                
'history' is not recognized as an internal or external command,                                            
operable program or batch file.