> There is one more really cool thing to know about sourcing. You can use a single dot (.) as a shortcut for the source command.
That's backwards. Dot is the POSIX-standard command; source isn't. So it's more like, in some shells you can use the readable source command instead of the cryptic dot, at the cost of portability.
source does not go without a mention in POSIX. The specification says that if the command name in a command matches one of a certain set of identifiers, the results are unspecified. source is one of those identifiers.
That's backwards. Dot is the POSIX-standard command; source isn't. So it's more like, in some shells you can use the readable source command instead of the cryptic dot, at the cost of portability.
source does not go without a mention in POSIX. The specification says that if the command name in a command matches one of a certain set of identifiers, the results are unspecified. source is one of those identifiers.