default_system_path()
Class Public methods
Returns the directories in the current shell's PATH environment variable as an array of directory names. This sets the #system_path for all instances of Shell.
Example: If in your current shell, you did:
$ echo $PATH /usr/bin:/bin:/usr/local/bin
Running this method in the above shell would then return:
["/usr/bin", "/bin", "/usr/local/bin"]
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