Default options

[piotr-yuxuan]

Provide default options that may be overriden or just disabled by the dev user

• --help, -h, -?
• --now, --start-time, -t
• -!, --about
• -v, --verbose, log-level, -d, -x, -s, --silent, --quiet, -q
• -V, --version – perhaps it should include the semantic version on the first line and other lines could contain build time and other data?
• -u, --user the value of ${USER}, would it be any useful?
• any other?
• Path of the caller, and path of the current program called.

References:

• http://catb.org/~esr/writings/taoup/html/ch10s05.html
• https://tldp.org/LDP/abs/html/standard-options.html