Miscellaneous

`!'

Will run the rest of the line as a system command.

`#'

Will interpret the rest of the line as a comment. (This command is a GNU extension.)

`:r'

Will pop the top two values off of the stack. The old second-to-top value will be stored in the array r, indexed by the old top-of-stack value.

`;r'

Pops the top-of-stack and uses it as an index into the array r. The selected value is then pushed onto the stack.

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