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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.docbook.org/xml/4.5/docbookx.dtd"
[
<!ENTITY date SYSTEM "man-date.ent" >
]
>
<refentry lang="en">
<refentryinfo>
<productname>RabbitMQ C Client</productname>
<authorgroup>
<corpauthor>The RabbitMQ Team <<ulink url="mailto:info@rabbitmq.com"><email>info@rabbitmq.com</email></ulink>></corpauthor>
</authorgroup>
<date>&date;</date>
</refentryinfo>
<refmeta>
<refentrytitle>amqp-consume</refentrytitle>
<manvolnum>1</manvolnum>
<refmiscinfo class="manual">RabbitMQ C Client</refmiscinfo>
</refmeta>
<refnamediv>
<refname>amqp-consume</refname>
<refpurpose>Consume messages from a queue on an AMQP server</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>amqp-consume</command>
<arg choice="opt" rep="repeat">
<replaceable>OPTION</replaceable>
</arg>
<arg choice="req">
<replaceable>command</replaceable>
</arg>
<arg choice="opt" rep="repeat">
<replaceable>args</replaceable>
</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>amqp-consume</command> consumes messages from a
queue on an AMQP server. For each message that arrives, a
receiving command is run, with the message body supplied
to it on standard input.
</para>
<para>
<command>amqp-consume</command> can consume from an
existing queue, or it can create a new queue. It can
optionally bind the queue to an existing exchange.
</para>
<para>
By default, messages will be consumed with explicit
acknowledgements. A message will only be acknowledged if
the receiving command exits successfully (i.e. with an
exit code of zero). The AMQP <quote>no ack</quote> mode
(a.k.a. auto-ack mode) can be enable with the
<option>-A</option> option.
</para>
</refsect1>
<refsect1>
<title>Options</title>
<variablelist>
<varlistentry>
<term><option>-q</option></term>
<term><option>--queue</option>=<replaceable class="parameter">queue name</replaceable></term>
<listitem>
<para>
The name of the queue to consume messages
from.
</para>
<para>
If the <option>--queue</option> option is
omitted, the AMQP server will assign a unique
name to the queue, and that server-assigned
name will be dixsplayed on stderr; this case
implies that an exclusive queue should be
declared.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-e</option></term>
<term><option>--exchange</option>=<replaceable class="parameter">exchange name</replaceable></term>
<listitem>
<para>
Specifies that an exclusive queue should
be declared, and bound to the given exchange.
The specified exchange should already exist
unless the <option>--exchange-type</option>
option is used to request the creation of an
exchange.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-r</option></term>
<term><option>--routing-key</option>=<replaceable class="parameter">routing key</replaceable></term>
<listitem>
<para>
The routing key for binding. If omitted, an
empty routing key is assumed.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-d</option></term>
<term><option>--declare</option></term>
<listitem>
<para>
Forces an exclusive queue to be declared,
even when it otherwise would not be. That is,
when a queue name is specified with the
<option>--queue</option> option, but no
binding to an exchange is requested with the
<option>--exchange</option> option.
Note: this option is deprecated and may be
removed in a future version, use the
<option>--exclusive</option> option to
explicitly declare an exclusive queue.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-x</option></term>
<term><option>--exclusive</option></term>
<listitem>
<para>
Declared queues are non-exclusive by default,
this option forces declaration of exclusive
queues.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-A</option></term>
<term><option>--no-ack</option>=<replaceable class="parameter">routing key</replaceable></term>
<listitem>
<para>
Enable <quote>no ack</quote> mode: The AMQP
server will unconditionally acknowledge each
message that is delivered, regardless of
whether the target command exits successfully
or not.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-c</option></term>
<term><option>--count</option>=<replaceable class="parameter">limit</replaceable></term>
<listitem>
<para>
Stop consuming after the given number of
messages have been received.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-p</option></term>
<term><option>--prefetch-count</option>=<replaceable class="parameter">limit</replaceable></term>
<listitem>
<para>
Request the server to only send
<replaceable class="parameter">limit</replaceable>
messages at a time.
</para>
<para>
If any value was passed to <option>--count</option>,
the value passed to <option>--prefetch-count</option>
should be smaller than that, or otherwise it will be
ignored.
</para>
<para>
If <option>-A</option>/<option>--no-ack</option> is
passed, this option has no effect.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Examples</title>
<variablelist>
<varlistentry>
<term>Consume messages from an existing queue
<quote><systemitem
class="resource">myqueue</systemitem></quote>, and
output the message bodies on standard output via
<command>cat</command>:</term>
<listitem>
<screen><prompt>$ </prompt><userinput>amqp-publish -q myqueue cat</userinput></screen>
</listitem>
</varlistentry>
<varlistentry>
<term>Bind a new exclusive queue to an
exchange <quote><systemitem
class="resource">myexch</systemitem></quote>, and send
each message body to the script
<filename>myscript</filename>, automatically
acknowledging them on the server:</term>
<listitem>
<screen><prompt>$ </prompt><userinput>amqp-consume -A -e myexch ./myscript</userinput></screen>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>See also</title>
<para>
<citerefentry><refentrytitle>librabbitmq-tools</refentrytitle><manvolnum>7</manvolnum></citerefentry>
describes connection-related options common to all the
RabbitMQ C Client tools.
</para>
</refsect1>
</refentry>
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