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Diffstat (limited to 'lib/erl_interface/doc/src/erl_call.xml')
| -rw-r--r-- | lib/erl_interface/doc/src/erl_call.xml | 196 |
1 files changed, 110 insertions, 86 deletions
diff --git a/lib/erl_interface/doc/src/erl_call.xml b/lib/erl_interface/doc/src/erl_call.xml index f8fe409560..ebd9172f98 100644 --- a/lib/erl_interface/doc/src/erl_call.xml +++ b/lib/erl_interface/doc/src/erl_call.xml @@ -28,135 +28,146 @@ <docno></docno> <approved>Bjarne Däcker</approved> <checked>Torbjörn Törnkvist</checked> - <date>97-05-16</date> + <date>1997-05-16</date> <rev>B</rev> <file>erl_call.xml</file> </header> <com>erl_call</com> <comsummary>Call/start a distributed Erlang node.</comsummary> <description> - <p><c><![CDATA[erl_call]]></c> makes it possible to start and/or communicate with - a distributed Erlang node. It is built upon the <c><![CDATA[erl_interface]]></c> - library as an example application. Its purpose is to use an Unix shell script to interact with a distributed Erlang node. It performs all - communication with the Erlang <em>rex server</em>, using the standard Erlang RPC facility. It does not require any special - software to be run at the Erlang target node.</p> + <p><c><![CDATA[erl_call]]></c> makes it possible to start and/or + communicate with a distributed Erlang node. It is built upon the + <c><![CDATA[Erl_Interface]]></c> library as an example application. + Its purpose is to use a Unix shell script to interact with a distributed + Erlang node. It performs all communication with the Erlang + <em>rex server</em>, using the standard Erlang RPC facility. It does not + require any special software to be run at the Erlang target node.</p> + <p>The main use is to either start a distributed Erlang node or to make an ordinary function call. However, it is also - possible to pipe an Erlang module to <c><![CDATA[erl_call]]></c> and have it - compiled, or to pipe a sequence of Erlang expressions to be evaluated + possible to pipe an Erlang module to <c><![CDATA[erl_call]]></c> and have + it compiled, or to pipe a sequence of Erlang expressions to be evaluated (similar to the Erlang shell).</p> - <p>Options, which cause <c><![CDATA[stdin]]></c> to be read, can be used with - advantage - as scripts from within (Unix) shell scripts. Another - nice use of <c><![CDATA[erl_call]]></c> could be from (http) CGI-bin scripts.</p> + + <p>Options, which cause <c><![CDATA[stdin]]></c> to be read, can be used + with advantage, + as scripts from within (Unix) shell scripts. Another nice use + of <c><![CDATA[erl_call]]></c> could be from (HTTP) CGI-bin scripts.</p> </description> + <funcs> <func> <name>erl_call <options></name> <fsummary>Start/call Erlang.</fsummary> <desc> - <p>Each option flag is described below with its name, type and + <p>Starts/calls Erlang.</p> + <p>Each option flag is described below with its name, type, and meaning.</p> <taglist> - <tag>-a [Mod [Fun [Args]]]]</tag> + <tag><c>-a [Mod [Fun [Args]]]]</c></tag> <item> - <p>(<em>optional</em>): Applies the specified function - and returns the result. <c><![CDATA[Mod]]></c> must be specified, however - <c>start</c> and <c>[]</c> are assumed for unspecified <c><![CDATA[Fun]]></c> and <c><![CDATA[Args]]></c>, respectively. <c><![CDATA[Args]]></c> should - be in the same format as for <c><![CDATA[erlang:apply/3]]></c>. Note - that this flag takes exactly one argument, so quoting - may be necessary in order to group <c><![CDATA[Mod]]></c>, <c><![CDATA[Fun]]></c> - and <c><![CDATA[Args]]></c>, in a manner dependent on the behavior - of your command shell.</p> - <p></p> + <p>(<em>Optional.</em>) Applies the specified function + and returns the result. <c><![CDATA[Mod]]></c> must be specified. + However, <c>start</c> and <c>[]</c> are assumed for unspecified + <c><![CDATA[Fun]]></c> and <c><![CDATA[Args]]></c>, respectively. + <c><![CDATA[Args]]></c> is to be in the same format as for + <seealso marker="erts:erlang#apply/3"> + <c>erlang:apply/3</c></seealso> in <c>ERTS</c>.</p> + <p>Notice that this flag takes exactly one argument, so quoting + can be necessary to group <c><![CDATA[Mod]]></c>, + <c><![CDATA[Fun]]></c>, and <c><![CDATA[Args]]></c> in a manner + dependent on the behavior of your command shell.</p> </item> - <tag>-c Cookie</tag> + <tag><c>-c Cookie</c></tag> <item> - <p>(<em>optional</em>): Use this option to specify a certain cookie. If no cookie is specified, the <c><![CDATA[~/.erlang.cookie]]></c> file is read and its content are used as cookie. The Erlang node we want to communicate with must have the same cookie.</p> + <p>(<em>Optional.</em>) Use this option to specify a certain cookie. + If no cookie is specified, the <c><![CDATA[~/.erlang.cookie]]></c> + file is read and its content is used as cookie. The Erlang node + we want to communicate with must have the same cookie.</p> </item> - <tag>-d</tag> + <tag><c>-d</c></tag> <item> - <p>(<em>optional</em>): Debug mode. This causes all IO to be output - to the file <c><![CDATA[~/.erl_call.out.Nodename]]></c>, where <c><![CDATA[Nodename]]></c> + <p>(<em>Optional.</em>) Debug mode. This causes all I/O to be output + to the <c><![CDATA[~/.erl_call.out.Nodename]]></c> file, where + <c><![CDATA[Nodename]]></c> is the node name of the Erlang node in question.</p> - <p></p> </item> - <tag>-e</tag> + <tag><c>-e</c></tag> <item> - <p>(<em>optional</em>): Reads a sequence of Erlang expressions, separated - by '<em>,</em>' and ended with a '<em>.</em>', from <c><![CDATA[stdin]]></c> until - EOF (Control-D). Evaluates the expressions and returns the result from - the last expression. Returns <c><![CDATA[{ok,Result}]]></c> if successful.</p> - <p></p> + <p>(<em>Optional.</em>) Reads a sequence of Erlang expressions, + separated by comma (,) and ended with a full stop (.), from + <c><![CDATA[stdin]]></c> until EOF (Control-D). Evaluates the + expressions and returns the result from the last expression. + Returns <c><![CDATA[{ok,Result}]]></c> on success.</p> </item> - <tag>-h HiddenName</tag> + <tag><c>-h HiddenName</c></tag> <item> - <p>(<em>optional</em>): Specifies the name of the hidden node + <p>(<em>Optional.</em>) Specifies the name of the hidden node that <c><![CDATA[erl_call]]></c> represents.</p> - <p></p> </item> - <tag>-m</tag> + <tag><c>-m</c></tag> <item> - <p>(<em>optional</em>): Reads an Erlang module from <c><![CDATA[stdin]]></c> and - compiles it.</p> - <p></p> + <p>(<em>Optional.</em>) Reads an Erlang module from + <c><![CDATA[stdin]]></c> and compiles it.</p> </item> - <tag>-n Node</tag> + <tag><c>-n Node</c></tag> <item> - <p>(one of <c><![CDATA[-n, -name, -sname]]></c> is required): - Has the same meaning as <c><![CDATA[-name]]></c> and can still be used for - backwards compatibility reasons.</p> - <p></p> + <p>(One of <c><![CDATA[-n, -name, -sname]]></c> is required.) + Has the same meaning as <c><![CDATA[-name]]></c> and can still be + used for backward compatibility reasons.</p> </item> - <tag>-name Node</tag> + <tag><c>-name Node</c></tag> <item> - <p>(one of <c><![CDATA[-n, -name, -sname]]></c> is required): <c><![CDATA[Node]]></c> is the name of the node to be + <p>(One of <c><![CDATA[-n, -name, -sname]]></c> is required.) + <c><![CDATA[Node]]></c> is the name of the node to be started or communicated with. It is assumed that - <c><![CDATA[Node]]></c> is started with <c><![CDATA[erl -name]]></c>, which means that fully - qualified long node names are used. - If the <c><![CDATA[-s]]></c> option is given, an Erlang node will (if necessary) - be started with <c><![CDATA[erl -name]]></c>.</p> - <p></p> + <c><![CDATA[Node]]></c> is started with + <c><![CDATA[erl -name]]></c>, which means that fully + qualified long node names are used. If option + <c><![CDATA[-s]]></c> is specified, an Erlang node will (if + necessary) be started with <c><![CDATA[erl -name]]></c>.</p> </item> - <tag>-q</tag> + <tag><c>-q</c></tag> <item> - <p>(<em>optional</em>): Halts the Erlang node specified - with the -n switch. This switch overrides the -s switch.</p> - <p></p> + <p>(<em>Optional.</em>) Halts the Erlang node specified + with switch <c>-n</c>. This switch overrides switch <c>-s</c>.</p> </item> - <tag>-r</tag> + <tag><c>-r</c></tag> <item> - <p>(<em>optional</em>): Generates a random name of the hidden node + <p>(<em>Optional.</em>) Generates a random name of the hidden node that <c><![CDATA[erl_call]]></c> represents.</p> - <p></p> </item> - <tag>-s</tag> + <tag><c>-s</c></tag> <item> - <p>(<em>optional</em>): Starts a distributed Erlang node if necessary. - This means that in a sequence of calls, where the '<c><![CDATA[-s]]></c>' - and '<c><![CDATA[-n Node]]></c>' are constant, only the first call will start - the Erlang node. This makes the rest of the communication - very fast. This flag is currently only available on the Unix platform.</p> - <p></p> + <p>(<em>Optional.</em>) Starts a distributed Erlang node if + necessary. This means that in a sequence of calls, where + '<c><![CDATA[-s]]></c>' and '<c><![CDATA[-n Node]]></c>' are + constant, only the first call starts the Erlang node. This makes + the rest of the communication very fast. This flag is currently + only available on Unix-like platforms (Linux, Mac OS X, Solaris, + and so on).</p> </item> - <tag>-sname Node</tag> + <tag><c>-sname Node</c></tag> <item> - <p>(one of <c><![CDATA[-n, -name, -sname]]></c> is required): <c><![CDATA[Node]]></c> is the name of the node to - be started or communicated with. It is assumed that <c><![CDATA[Node]]></c> is started with <c><![CDATA[erl -sname]]></c> which means that short node names are used. - If <c><![CDATA[-s]]></c> option is given, an Erlang node will be started (if necessary) with <c><![CDATA[erl -sname]]></c>.</p> - <p></p> + <p>(One of <c><![CDATA[-n, -name, -sname]]></c> is required.) + <c><![CDATA[Node]]></c> is the name of the node to be started + or communicated with. It is assumed that <c><![CDATA[Node]]></c> + is started with <c><![CDATA[erl -sname]]></c>, which means that + short node names are used. If option <c><![CDATA[-s]]></c> is + specified, an Erlang node is started (if necessary) with + <c><![CDATA[erl -sname]]></c>.</p> </item> - <tag>-v</tag> + <tag><c>-v</c></tag> <item> - <p>(<em>optional</em>): Prints a lot of <c><![CDATA[verbose]]></c> information. - This is only useful for the developer and maintainer of <c><![CDATA[erl_call]]></c>.</p> - <p></p> + <p>(<em>Optional.</em>) Prints a lot of <c><![CDATA[verbose]]></c> + information. This is only useful for the developer and maintainer + of <c><![CDATA[erl_call]]></c>.</p> </item> - <tag>-x ErlScript</tag> + <tag><c>-x ErlScript</c></tag> <item> - <p>(<em>optional</em>): Specifies another name of the Erlang start-up script - to be used. If not specified, the standard <c><![CDATA[erl]]></c> start-up script - is used.</p> + <p>(<em>Optional.</em>) Specifies another name of the Erlang + startup script to be used. If not specified, the standard + <c><![CDATA[erl]]></c> startup script is used.</p> </item> </taglist> </desc> @@ -165,20 +176,29 @@ <section> <title>Examples</title> - <p>Starts an Erlang node and calls <c><![CDATA[erlang:time/0]]></c>.</p> + <p>To start an Erlang node and call <c><![CDATA[erlang:time/0]]></c>:</p> + <code type="none"><![CDATA[ erl_call -s -a 'erlang time' -n madonna {18,27,34} ]]></code> - <p>Terminates an Erlang node by calling <c><![CDATA[erlang:halt/0]]></c>.</p> + + <p>To terminate an Erlang node by calling + <c><![CDATA[erlang:halt/0]]></c>:</p> + <code type="none"><![CDATA[ erl_call -s -a 'erlang halt' -n madonna ]]></code> - <p>An apply with several arguments.</p> + + <p>To apply with many arguments:</p> + <code type="none"><![CDATA[ erl_call -s -a 'lists map [{math,sqrt},[1,4,9,16,25]]' -n madonna ]]></code> - <p>Evaluates a couple of expressions. <em>The input ends with EOF (Control-D)</em>.</p> + + <p>To evaluate some expressions + (<em>the input ends with EOF (Control-D)</em>):</p> + <code type="none"><![CDATA[ erl_call -s -e -n madonna statistics(runtime), @@ -189,7 +209,11 @@ Y=2, ^D {ok,{3,0}} ]]></code> - <p>Compiles a module and runs it. <em>Again, the input ends with EOF (Control-D)</em>. (In the example shown, the output has been formatted afterwards).</p> + + <p>To compile a module and run it (<em>again, the input ends with EOF + (Control-D)</em>):</p> + <p>(In the example, the output has been formatted afterwards.)</p> + <code type="none"><![CDATA[ erl_call -s -m -a lolita -n madonna -module(lolita). |