Interactive help: Difference between revisions
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{{draft task}}
;Task:
Demonstrate any interactive (or command line) help offered by the language implementation.
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=={{header|AWK}}==
<syntaxhighlight lang="awk">
# syntax: GAWK --help
</syntaxhighlight>
</lang>▼
{{out}}
<pre>
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gawk '{ sum += $1 }; END { print sum }' file
gawk -F: '{ print $1 }' /etc/passwd
=={{header|Common Lisp}}==
Common Lisp supports several interactive features for exploring the language and runtime. The built-in functions [http://www.lispworks.com/documentation/lw71/CLHS/Body/f_docume.htm <code>documentation</code>] and [http://clhs.lisp.se/Body/f_descri.htm#describe <code>describe</code>] will both present information on objects in the system.
{{out}}
<pre>
CL-USER> (describe #'char-code)
#<FUNCTION CHAR-CODE>
[compiled function]
Lambda-list: (CHAR)
Declared type: (FUNCTION (CHARACTER) (VALUES (MOD 1114112) &OPTIONAL))
Documentation:
Return the integer code of CHAR.
Known attributes: foldable, flushable, unsafely-flushable, movable
Source file: SYS:SRC;CODE;TARGET-CHAR.LISP
; No value
CL-USER> (documentation #'char-code 'function)
"Return the integer code of CHAR."
</pre>
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Additionally, by pressing <code>F1</code> in the listener, you can access the help browser, an offline version of [https://docs.factorcode.org/content/article-handbook.html Factor's documentation]. Factor's help browser interfaces with the listener in various ways. For example, pressing <code>ctrl+h</code> while the cursor is over a word will take you to that word's documentation. Running <code>"sequences" about</code> in the listener will take you to the documentation for the <code>sequences</code> vocabulary.
=={{header|FreeBASIC}}==
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=={{header|Julia}}==
When Julia is run without a program file as argument, the REPL (Read-Evaluate-Print Loop) runs. Entering a ? at the prompt brings up help, with help on a specific topic obtained if the topic name is preceded by ? at the prompt.
<
> julia
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The use of the return keyword is exactly the same as in other languages, but is often optional. A function without
an explicit return statement will return the last expression in the function body.
</syntaxhighlight>
=={{header|Nim}}==
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See docs\phix\phix.chm for the complete manual, or [http://phix.x10.mx/docs/html/phix.htm online].<br>
When p -?, p -h, p -help, or p --help is entered:
<!--(notonline)-->
<pre>
interpret: <filename>
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Phix hybrid interpreter/compiler.
Version 1.0.
Enter ? for options or filename to execute:
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Individual Raku scripts are to some extent self-documenting. If the script has a MAIN sub, and it is called with improper parameters, it will display an automatically generated help message showing the various possible parameters, which are required, which are optional, and what type each takes:
<syntaxhighlight lang="raku"
Str $run, #= Task or file name
Str :$lang = 'raku', #= Language, default raku
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) {
# do whatever
}</
{{out|When saved locally as main.raku and invoked with no (or wrong) passed parameters}}
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$ wren_cli --version
wren 0.
</pre>
=={{header|Yabasic}}==
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