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Revised(5) Scheme

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6.6.4 System interface

Questions of system interface generally fall outside of the domain of this report. However, the following operations are important enough to deserve description here.

optional procedure: load filename

Filename should be a string naming an existing file containing Scheme source code. The `load' procedure reads expressions and definitions from the file and evaluates them sequentially. It is unspecified whether the results of the expressions are printed. The `load' procedure does not affect the values returned by `current-input-port' and `current-output-port'. `Load' returns an unspecified value.

Rationale: For portability, `load' must operate on source files. Its operation on other kinds of files necessarily varies among implementations.

optional procedure: transcript-on filename
optional procedure: transcript-off

Filename must be a string naming an output file to be created. The effect of `transcript-on' is to open the named file for output, and to cause a transcript of subsequent interaction between the user and the Scheme system to be written to the file. The transcript is ended by a call to `transcript-off', which closes the transcript file. Only one transcript may be in progress at any time, though some implementations may relax this restriction. The values returned by these procedures are unspecified.


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