Execute a shell command.

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(**system** _command_)

_command_ is a string containing the command you want to run.

Returns the exit code of the command.

Example:

    (import (scheme base)
            (scheme write)
            (scheme file)
            (retropikzel system))

    (define testfile "test.txt")
    (system (apply string-append `("echo \"Hello\" > " ,testfile)))

    (define text (with-input-from-file testfile (lambda () (read-line))))
    (display text)
    (newline)