AT AN OPERATING SYSTEM PROMPT, SET YOUR ORACLE_SID ENVIRONMENT VARIABLE TO THE NAME OF THE ASM INSTANCE, AND LAUNCH THE ASMCMD UTILITY

1. At an operating system prompt, set your ORACLE_SID environment variable to the name of the ASM instance, and launch the ASMCMD utility. On Windows:

set ORACLE_SID=+asm

asmcmd.bat

Or on Unix:

export ORACLE_SID=+asm

asmcmd