file-readable?[procedure] file-readable? pathname
[procedure] file-writable? pathname
[procedure] file-executable? pathname
Scsh: file accessibility query.
These functions are called file-is-readable?, file-is-writable?,
file-is-executable?, or file-read-access?, file-write-access?,
file-execute-access? in some implementations.
Some implementations also have POSIX access() interface; see sys-access.
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