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139 lines
5.1 KiB
XML
139 lines
5.1 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-id128" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-id128</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-id128</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-id128</refname>
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<refpurpose>Generate and print sd-128 identifiers</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-id128</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">new</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-id128</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">machine-id</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-id128</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">boot-id</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-id128</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">invocation-id</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>id128</command> may be used to conveniently print
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<citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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UUIDs. What identifier is printed depends on the specific verb.</para>
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<para>With <command>new</command>, a new random identifier will be generated.</para>
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<para>With <command>machine-id</command>, the identifier of the current machine will be
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printed. See
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<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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<para>With <command>boot-id</command>, the identifier of the current boot will be
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printed.</para>
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<para>Both <command>machine-id</command> and <command>boot-id</command> may be combined
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with the <option>--app-specific=<replaceable>app-id</replaceable></option> switch to
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generate application-specific IDs. See
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<citerefentry><refentrytitle>sd_id128_get_machine</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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for the discussion when this is useful.</para>
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<para>With <command>invocation-id</command>, the identifier of the current service invocation
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will be printed. This is available in systemd services. See
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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<para>With <command>show</command>, well-known IDs are printed (for now, only GPT partition type UUIDs),
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along with brief identifier strings. When no arguments are specified, all known IDs are shown. When
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arguments are specified, they must be the identifiers or ID values of one or more known IDs, which are
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then printed. Combine with <option>--uuid</option> to list the IDs in UUID style, i.e. the way GPT
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partition type UUIDs are usually shown.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>-p</option></term>
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<term><option>--pretty</option></term>
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<listitem><para>Generate output as programming language snippets.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-a <replaceable>app-id</replaceable></option></term>
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<term><option>--app-specific=<replaceable>app-id</replaceable></option></term>
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<listitem><para>With this option, an identifier that is the result of hashing the
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application identifier <replaceable>app-id</replaceable> and the machine identifier will be
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printed. The <replaceable>app-id</replaceable> argument must be a valid sd-id128 string
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identifying the application.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-u</option></term>
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<term><option>--uuid</option></term>
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<listitem><para>Generate output as an UUID formatted in the "canonical representation", with five
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groups of digits separated by hyphens. See the
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<ulink url="https://en.wikipedia.org/wiki/Universally_unique_identifier#Format">wikipedia</ulink>
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for more discussion.</para></listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success, 0 is returned, a non-zero failure code otherwise.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_id128_get_machine</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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