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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1+ -->
<refentry id="systemd-id128" xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>systemd-id128</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>systemd-id128</refentrytitle>
<manvolnum>1</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-id128</refname>
<refpurpose>Generate and print sd-128 identifiers</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>systemd-id128</command>
<arg choice="opt" rep="repeat">OPTIONS</arg>
<arg choice="plain">new</arg>
</cmdsynopsis>
<cmdsynopsis>
<command>systemd-id128</command>
<arg choice="opt" rep="repeat">OPTIONS</arg>
<arg choice="plain">machine-id</arg>
</cmdsynopsis>
<cmdsynopsis>
<command>systemd-id128</command>
<arg choice="opt" rep="repeat">OPTIONS</arg>
<arg choice="plain">boot-id</arg>
</cmdsynopsis>
<cmdsynopsis>
<command>systemd-id128</command>
<arg choice="opt" rep="repeat">OPTIONS</arg>
<arg choice="plain">invocation-id</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><command>id128</command> may be used to conveniently print
<citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>
UUIDs. What identifier is printed depends on the specific verb.</para>
<para>With <command>new</command>, a new random identifier will be generated.</para>
<para>With <command>machine-id</command>, the identifier of the current machine will be
printed. See
<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
<para>With <command>boot-id</command>, the identifier of the current boot will be
printed.</para>
<para>Both <command>machine-id</command> and <command>boot-id</command> may be combined
with the <option>--app-specific=<replaceable>app-id</replaceable></option> switch to
generate application-specific IDs. See
<citerefentry><refentrytitle>sd_id128_get_machine</refentrytitle><manvolnum>3</manvolnum></citerefentry>
for the discussion when this is useful.</para>
<para>With <command>invocation-id</command>, the identifier of the current service invocation
will be printed. This is available in systemd services. See
<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
</refsect1>
<refsect1>
<title>Options</title>
<para>The following options are understood:</para>
<variablelist>
<varlistentry>
<term><option>-p</option></term>
<term><option>--pretty</option></term>
<listitem><para>Generate output as programming language snippets.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-a <replaceable>app-id</replaceable></option></term>
<term><option>--app-specific=<replaceable>app-id</replaceable></option></term>
<listitem><para>With this option, an identifier that is the result of hashing the
application identifier <replaceable>app-id</replaceable> and the machine identifier will be
printed. The <replaceable>app-id</replaceable> argument must be a valid sd-id128 string
identifying the application.</para>
</listitem>
</varlistentry>
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />
</variablelist>
</refsect1>
<refsect1>
<title>Exit status</title>
<para>On success, 0 is returned, a non-zero failure code otherwise.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_id128_get_machine</refentrytitle><manvolnum>3</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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