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/usr/lib/help/sys_strerror is in scheme9 2013.11.26-1.

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S9 EXT  (sys:strerror integer)  ==>  string

Create a fresh string explaining the Unix error condition encoded
in INTEGER. Valid condition codes are delivered by the SYS:ERRNO
procedure.

(sys:strerror 2)  ==>  "No such file or directory"