These procedures are not part of the Scheme standard, but are available in most implementations. These procedures work reliably only for files that are not directories. 893189629 assuming that the file hello.scm was last messed with sometime on 21 April 1998. The system procedure executes its argument string as an operating-system command. It returns true if the command executed successfully with an exit status 0, and false if it failed to execute or exited with a non-zero status.
Any output generated by the command goes to standard output.
The getenv procedure returns the setting of an operating-system environment variable.