Planned⎕File File r←[x] ⎕File y

This primitive or feature is planned, that is, it doesn't appear in the most recent released implementation of TinyAPL. Details may change before it is added!
Category: I/O

y must be a character vector. If x is not provided, r is the contents of the file at path y. If x is provided, the contents of the file at path y are set to ⍕x, and r is the empty vector.