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    (os/chmod path mode)
    Change file permissions, where mode is a permission string as returned
    by os/perm-string, or an integer as returned by os/perm-int. When mode
    is an integer, it is interpreted as a Unix permission value, best
    specified in octal, like 8r666 or 8r400. Windows will not differentiate
    between user, group, and other permissions, and thus will combine all
    of these permissions. Returns nil.

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(spit "/tmp/hello.sh" "#!/bin/bash\necho 'Hello from Bash!'\n")
(os/chmod "/tmp/hello.sh" "rwx------")
(os/setenv "PATH" (string (os/getenv "PATH") ":/tmp"))
(os/shell "hello.sh")