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man/systemd-id128: fix example
The example was supposed to show how
machine-id/new/machine-id --app-specific/show --app-specific tie together, but
the verb was ommitted.
I also extended the explanation a bit and used long option form in the first
example for more clarity. In the second, more complicated example, the
one-letter form is used for brevity.
Noticed in post-review:
b37e8184a5 (r1315678438)
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@ -161,10 +161,10 @@
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<example>
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<title>Show a well-known UUID</title>
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<programlisting>
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$ systemd-id128 show -P user-home
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$ systemd-id128 show --value user-home
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773f91ef66d449b5bd83d683bf40ad16
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$ systemd-id128 show -Pu user-home
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$ systemd-id128 show --value --uuid user-home
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773f91ef-66d4-49b5-bd83-d683bf40ad16
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$ systemd-id128 show 773f91ef-66d4-49b5-bd83-d683bf40ad16
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@ -183,16 +183,18 @@ $ systemd-id128 machine-id -u
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$ systemd-id128 new -u
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1fb8f24b-02df-458d-9659-cc8ace68e28a
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$ systemd-id128 --app=1fb8f24b-02df-458d-9659-cc8ace68e28a
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$ systemd-id128 machine-id -u -a 1fb8f24b-02df-458d-9659-cc8ace68e28a
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47b82cb1-5339-43da-b2a6-1c350aef1bd1
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$ systemd-id128 -Pu show 3a9d668b-4db7-4939-8a4a-5e78a03bffb7 --app=1fb8f24b-02df-458d-9659-cc8ace68e28a
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$ systemd-id128 -Pu show 3a9d668b-4db7-4939-8a4a-5e78a03bffb7 \
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-a 1fb8f24b-02df-458d-9659-cc8ace68e28a
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47b82cb1-5339-43da-b2a6-1c350aef1bd1
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</programlisting>
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<para>On a given machine with the ID 3a9d668b-4db7-4939-8a4a-5e78a03bffb7, for the application
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1fb8f24b-02df-458d-9659-cc8ace68e28a, we generate an application-specific machine ID. If we want to
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later recreate the same calculation on a different machine, we need to specify both IDs explicitly.
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1fb8f24b-02df-458d-9659-cc8ace68e28a, we generate an application-specific machine ID
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(47b82cb1-5339-43da-b2a6-1c350aef1bd1). If we want to later recreate the same calculation on a
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different machine, we need to specify both IDs explicitly as parameters to <command>show</command>.
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</para>
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</example>
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</refsect1>
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