jcmd(1)jcmd(1)Namejcmd - Sends diagnostic command requests to a running Java Virtual
Machine
SYNOPSISjcmd [ options ]
jcmd [ pid | main-class ] PerfCounter.print
jcmd [ pid | main-class ] command [arguments]
jcmd [ pid | main-class ] -f file
options
The command-line options. See Options.
pid
Identifies the process that receives the diagnostic command
requests. The process must be a Java process. To get a list of
Java processes running on a machine, use jps(1) or jcmd(1).
main-class
The main class of the process that receives the diagnostic com‐
mand requests. When matching processes, any process whose main
class name contains the specified string as a substring is
matched. If several running Java processes share the same main
class, then the diagnostic command request is sent to all these
processes. To get a list of Java processes running on a machine,
use jps(1) or jcmd(1).
command [arguments]
The main class of the process that receives the diagnostic com‐
mand requests. When matching processes, any process whose main
class name contains the specified string as a substring is
matched. If several running Java processes share the same main
class, then the diagnostic command request is sent to all these
processes. To get a list of Java processes running on a machine,
use jps(1) or jcmd(1).
Perfcounter.print
Print the performance counters available on the targeted Java
processes. The list of performance counters might vary with the
Java process.
-f file
Read commands from file and call them on the targeted Java pro‐
cesses. In file, each command must be written on a single line.
Lines starting with # are ignored. Processing of file ends when
all lines have been called or when a line containing the stop
keyword is read.
DESCRIPTIONjcmd is a utility to send diagnostic command requests to a Java Virtual
Machine supporting this feature.
Used without arguments or with the -l option, jcmd prints the list of
running Java processes with their process ID, their main class and
their command-line arguments.
When a process ID is specified on the command line, jcmd sends the
diagnostic command request to the process with this ID.
When a main class is specified on the command line, jcmd sends the
diagnostic command request to all Java processes for which the com‐
mand-line argument is a substring of the Java process' main class.
With the PerfCounter.print argument, jcmd prints the performance coun‐
ters available on the targeted Java processes.
With the -f option, jcmd sends to the targeted Java processes the diag‐
nostic commands stored in the specified file.
OPTIONS
Options are mutually exclusive. Options, when used, must immediately
follow the command name.
-l Prints the list of running Java processes with their process IDs,
their main classes, and their command-line arguments.
-h Prints a help message.
-help
Prints a help message.
SEE ALSO
o jps
18 Jul 2013 jcmd(1)
