Performs conditional processing in batch programs. IF NOT ERRORLEVEL number command IF NOT string1=string2 command IF NOT ...

Performs conditional processing in batch programs.    IF [NOT] ERRORLEVEL number command  IF [NOT] string1==string2 command  IF [NOT] EXIST filename command      NOT               Specifies that Windows should carry out                       the command only if the condition is false.      ERRORLEVEL number Specifies a true condition if the last program run                      returned an exit code equal to or greater than the number                      specified.      string1==string2  Specifies a true condition if the specified text strings                      match.      EXIST filename    Specifies a true condition if the specified filename                      exists.      command           Specifies the command to carry out if the condition is                      met.  Command can be followed by ELSE command which                      will execute the command after the ELSE keyword if the                      specified condition is FALSE    The ELSE clause must occur on the same line as the command after the IF.  For  example:        IF EXIST filename. (          del filename.      ) ELSE (          echo filename. missing.      )    The following would NOT work because the del command needs to be terminated  by a newline:        IF EXIST filename. del filename. ELSE echo filename. missing    Nor would the following work, since the ELSE command must be on the same line  as the end of the IF command:        IF EXIST filename. del filename.      ELSE echo filename. missing    The following would work if you want it all on one line:        IF EXIST filename. (del filename.) ELSE echo filename. missing