open-input-file[procedure] open-input-file filename
R5RS: Takes a string naming an existing file and returns an input port capable of delivering characters from the file. If the file cannot
be opened, an error is signalled.
See also open-output-file.
Bigloo, STk: extends this to allow piped command
in filename.
[procedure] open-input-file filename [mode]
Chicken: takes an optional argument which can be #:text, #:binary or #:append.
[procedure] open-input-file filename [flags]
Scsh: flags is an integer composed by or-ing
bit flags.
[procedure] open-input-file filename [options ...]
Gauche extends R5RS to take various keyword arguments to customize
behavior of open-input-file.
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