/usr/bin/s9help is in scheme9 2015.11.19-1build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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; s9help -- find and display S9fES help pages
; by Nils M Holm, 2010,2015
; Placed in the Public Domain
;
; Usage: s9help [-als] topic ...
;
; Options:
;
; -a find any match (default: full words only)
; -l long results (including context)
; -s search help pages (default: display)
(load-from-library "find-help.scm")
(load-from-library "name-to-file-name.scm")
(load-from-library "read-line.scm")
(load-from-library "parse-optionsb.scm")
(define search (option #\s #f))
(define long (option #\l #f))
(define any-match (option #\a #f))
(define show-help (option #\h #f))
(define options `(,search
,long
,any-match
,show-help))
(define (usage)
(display "Usage: s9help [-als] topic ...")
(newline))
(define (display-help topic)
(let loop ((exts (cons "." (map symbol->string *extensions*))))
(if (null? exts)
(begin (display* "s9: " topic ": help file not found" #\newline)
(sys:exit 1))
(let ((path (string-append (find-help-path)
"/"
(car exts)
"/"
(name->file-name topic))))
(if (not (file-exists? path))
(loop (cdr exts))
(with-input-from-file
path
(lambda ()
(newline)
(let print ((line (read-line)))
(if (eof-object? line)
(newline)
(begin (display line)
(newline)
(print (read-line))))))))))))
(let ((topic* (parse-options! (sys:command-line) options usage)))
(if (opt-val show-help)
(begin (display-usage
`(""
,usage
""
"Find and display S9fES help pages"
""
"-a find any match (default: full words only)"
"-l long results (including context)"
"-s search help pages (default: display)"
""))
(sys:exit 0)))
(let ((topic* (if (null? topic*)
(begin (usage)
(sys:exit 1))
topic*)))
(for-each (lambda (topic)
(if (opt-val search)
(find-help topic
(string-append
"p"
(if (opt-val long) "l" "")
(if (opt-val any-match) "a" "")))
(display-help topic)))
topic*)))
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