Package support for the dummy proxy used by the test suite
Returns a string representing the package version or an empty string if not installed. If more than one package name is specified, a dict of name/version pairs is returned.
CLI Example:
salt '*' pkg.version <package name> salt '*' pkg.version <package1> <package2> <package3> ...
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Licensed under the Apache License, Version 2.0.
https://docs.saltstack.com/en/latest/ref/modules/all/salt.modules.dummyproxy_pkg.html