bonsai<78> /opt/java/jdk1.6.0/bin/jhat -help
Started HTTP server on port 7000
Reading from -help...
java.io.FileNotFoundException: -help (No such file or directory)
        at java.io.FileInputStream.open(Native Method)
        at java.io.FileInputStream.<init>(FileInputStream.java:106)
        at java.io.FileInputStream.<init>(FileInputStream.java:66)
        at com.sun.tools.hat.internal.parser.Reader.readFile(Reader.java:83)
        at com.sun.tools.hat.Main.main(Main.java:158)
bonsai<79> /opt/java/jdk1.6.0/bin/jhat -h
Started HTTP server on port 7000
Reading from -h...
java.io.FileNotFoundException: -h (No such file or directory)
        at java.io.FileInputStream.open(Native Method)
        at java.io.FileInputStream.<init>(FileInputStream.java:106)
        at java.io.FileInputStream.<init>(FileInputStream.java:66)
        at com.sun.tools.hat.internal.parser.Reader.readFile(Reader.java:83)
        at com.sun.tools.hat.Main.main(Main.java:158)
bonsai<80> /opt/java/jdk1.6.0/bin/jhat
ERROR: No arguments supplied
Usage: jhat [-stack <bool>] [-refs <bool>] [-port <port>] [-baseline <file> -debug <int>] [-version] <file>

        -stack false: Turn off tracking object allocatoin call stack.
        -refs false: Turn off tracking of references to objects
        -port <port>: Set the port for the HTTP server. Defaults to 7000
        -exclude <file>: Specify a file that lists data members that should
                          be excluded from the reachableFrom query.
        -baseline <file>: Specify a baseline object dump. Objects in
                          both heap dumps with the same ID and same class will
                          be marked as not being "new".
        -debug <int>: Set debug level.
                            0: No debug output
                            1: Debug hprof file parsing
                            2: Debug hprof file parsing, no server
        -version Report version number
        -donationware Give information on the status of HAT
        <file> The file to read

For a dump file that contains multiple heap dumps,
you may specify which dump in the file
by appending "#<number>" to the file name, i.e. "foo.hprof#3".

All boolean options default to "true"