[grid@testdb1 ~]$ asmcmd
Connected to an idle instance.
ASMCMD> ls
ASMCMD-8102: no connection to ASM; command requires ASM to run
Solution:
[grid@testdb1 ~]$ export ORACLE_HOME=/opt/grid/product/11.2.0.3/
[grid@testdb1 ~]$ export PATH=/opt/grid/product/11.2.0.3/bin/
[grid@testdb1 ~]$ export ORACLE_SID=+ASM
[grid@testdb1 ~]$ asmcmd
ASMCMD> ls
DATA/
INDX/