Avago Technologies 3ware SAS 9750-16i4e - Manual (Page 138)

Chapter 2. CLI Syntax Reference
130 3ware SATA+SAS RAID Controller Card CLI Guide, Version 10.2
If you type the following
tw_cli /c7 show
error: (CLI003) specified controller does not exist.
echo $?
1
This example fails (returns 1) because there is no controller 7.
To view the return code for Windows, in a command window type:
tw_cli /c0 show
(c0 info shown here)
if errorlevel 0 echo 0
0
tw_cli /c7 show
error....
if errorlevel 1 echo 1
1
This example fails (returns 1) because there is no controller 7.