f puts the interpreter into file mode, meaning the next command does
something with files.
Getting data from a file
Let's say you have a file named
stuff.txt and you want to get the text
from that file. You can using
I like cheese
We'll use this to push the contents of the file to the stack (assuming
stuff.txt is in the same directory):
The stack now contains the string “I like cheese”.
Putting data in a file
fo, we can overwrite whatever is in a file with what is on the
"I don't like cheese""stuff.txt"fo
Anything that was in
stuff.txt is now gone, and it only contains “I
don't like cheese”.
fo will only put the second item on the stack into
the file, no other elements will be affected.