ASM Command-Line Utility(ASMCMD)

ASMCMD is a command-line utility that you can use to easily view and manipulate files and directories within Automatic Storage Management (ASM) disk groups. It can list the contents of disk groups, perform searches, create and remove directories and aliases, display space utilization, and more.

Table 20-1 Summary of ASM Commands

Command	Description
cd	Changes the current directory to the specified directory.
du	Displays the total disk space occupied by ASM files in the specified ASM directory and all its subdirectories, recursively.
exit	Exits ASMCMD.
find	Lists the paths of all occurrences of the specified name (with wildcards) under the specified directory.
help	Displays the syntax and description of ASMCMD commands.
ls	Lists the contents of an ASM directory, the attributes of the specified file, or the names and attributes of all disk groups.
lsct	Lists information about current ASM clients.
lsdg	Lists all disk groups and their attributes.
mkalias	Creates an alias for a system-generated filename.
mkdir	Creates ASM directories.
pwd	Displays the path of the current ASM directory.
rm	Deletes the specified ASM files or directories.
rmalias	Deletes the specified alias, retaining the file that the alias points to.

he asmcmd utility supports all common Linux commands:

    ASMCMD> ls -alt -- list directory contents

    ASMCMD> cd -- change directory

    ASMCMD> mkdir -- create (make)directory

    ASMCMD> du -- display directory space

    ASMCMD> find -- standard UNIX find command

    ASMCMD> rm -- remove file/directory

    ASMCMD> lsdg -- list diskgroups

    ASMCMD> pwd -- display current directory

Plus, we see some Oracle-only asmcmd commands:

    ASMCMD> lsct -- list all connected Oracle instances