dos中一些常用命令的errorlevel返回值

     (Note: Fail reply - unusually - returns ERRORLEVEL 1)

TRACERT.EXE
(a) Unable to resolve target system name            = ERRORLEVEL 1
     (usually=name not found on DomainNameServer)
(b) Invalid switch                                  = ERRORLEVEL 1
(c) Brief help (no parameter)                       = ERRORLEVEL 1
(d) Interrupted with [Ctrl-C]                       = ERRORLEVEL 255
Note: for TRACERT Brief help, type command without parameters

XCOPY.EXE
(a) File not found                                  = ERRORLEVEL 1
(b) Invalid date in /d switch                       = ERRORLEVEL 4
(c) Invalid number of parameters                    = ERRORLEVEL 4
(d) Invalid parameter                               = ERRORLEVEL 4
(e) Device not ready                                = ERRORLEVEL 4
(f) Unable to create directory                      = ERRORLEVEL 4
(g) System can't find file                          = ERRORLEVEL 5
     (this occurs when device such as NUL is used as Source file)

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