Keys

Technically, lin only distinguishes between 2 constructs when parsing syntax: numbers and keys. Keys form all of the syntax and commands. Any string of characters that is not a digit, period, or space will be parsed as a key.

Examples of keys:

asdf
+-*/
~
asdljfasdkfjklsadf

Examples of non-keys:

1234
log2
a e s t h e t i c
._.

Syntax Keys

Although still keys, these contain special features that cause them to be evaluated differently. Multi-character keys with a leading backslash \ will push the rest of the key (sans the leading backslash) as a string to the stack rather than evaluating it as a command. Multi-character keys with a leading pound symbol # signifies an ID; unless in certain cases, these kinds of keys are ignored.

Command Keys

Anything that is not a syntax key is considered a command key. A full list of such commands can be found here. Particularly special or important commands will be discussed in subsequent sections.