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A batch file can test whether it is running in a JP Software shell by attempting a numeric comparison:
This syntax is legal in COMMAND.COM and all compatible shells, including 4DOS, 4NT, Take Command, and CMD.EXE. In JP Software shells, this is a numeric comparison and true; in COMMAND.COM and CMD.EXE, it is a string comparison and false.
Once you have established that the batch file is running in a JP Software shell, internal variables like _CMDPROC, _4VER, _DOS, _DOSVER, _WIN, and _WINVER may be used to further determine the operating environment.
A batch file can test whether it is running in a JP Software shell by attempting a numeric comparison:
Code:
if 01 == 1.0 echo Running in 4DOS, 4NT or Take Command!This syntax is legal in COMMAND.COM and all compatible shells, including 4DOS, 4NT, Take Command, and CMD.EXE. In JP Software shells, this is a numeric comparison and true; in COMMAND.COM and CMD.EXE, it is a string comparison and false.
Once you have established that the batch file is running in a JP Software shell, internal variables like _CMDPROC, _4VER, _DOS, _DOSVER, _WIN, and _WINVER may be used to further determine the operating environment.