Returns whether the given file or directory exists or not.

Get timezone and generate corresponding TZ environment variable value, such as "UTC-09:30" Useful for timezone feature: in order to synchronize the timezone of the container with the one of the host, set the variable TZ.

inspired from https://www.socketloop.com/tutorials/golang-download-file-example TODO: check with proxies.

Hold information about the context in which nut has been called.