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To find the versions of Java have been installed on a Mac system or macOS is to run the command: /usr/libexec/java_home -V Steps to check installed Java versions: Open the Terminal window Go to the directory /usr/libexec, by doing cd /usr/libexec Type: ./java_home -V  

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To apply persistent shell limits, you need to add ulimit commands into respective startup shell files. For individual users, use: ~/.bashrc or ~/.bash_profile files. For all users, use: /etc/bashrc file. Suggested lines to add: # Changes the ulimit limits. ulimit -Sn 4096 # Increase open files.

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