find-default-jvm 1 user commands nosh find-default-jvm set the JAVA_HOME environment variable to denote the default JVM find-default-jvm next-prog find-default-jvm is a chain-loading utility that sets the JAVA_HOME environment variable to denote the root directory for the default JVM, and then chain loads to next-prog with the execvp3 function. If the environment variable is already set, it simply chain loads and does not alter it. next-prog may contain its own command line options, which find-default-jvm will ignore. First the files /usr/local/etc/javavms, /etc/javavms, and /usr/pkg/etc/javavms are checked for in order. If such a file exists, it is expected to be a (potentially commented) list of JVM programs, in descending priority order. The default JVM is the first in the list. The JAVA_HOME variable is set to the root of the JVM subtree, which is presumed to be the directory above the directory containing the named JVM program. If none of those files exist, then if the /usr/lib/jvm directory exists it is presumed to contain all of the JVM subtree root directories, either directly or as symbolic links. The JAVA_HOME variable is set to the one named default-java if that exists, or failing that the one named default-runtime if that exists. Failing either of those, the /usr/local/bin/java, /usr/pkg/bin/java, /usr/bin/java, and /bin/java files are checked in order, and if found the JAVA_HOME variable is set to the root of the JVM subtree, which is presumed from those filenames as aforementioned. Finally, as a last resort, the JVM root is presumed to be / which implies the JVM program at /bin/java. find-matching-jvm1 This addresses the more common use case of wanting to find JVMs that support particular versions of Java; but can potentially fail if there are no JVMs on the system even if the matching criteria are entirely open. Jonathan de Boyne Pollard