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GID 5 (for tty) is also special

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Xi Ruoyao 2022-05-02 16:02:10 +08:00
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chapter07/createfiles.xml
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@ -165,9 +165,14 @@ EOF</userinput></screen>
url="http://refspecs.linuxfoundation.org/lsb.shtml"/>) only recommends that,
besides the group <systemitem class="groupname">root</systemitem> with a
Group ID (GID) of 0, a group <systemitem class="groupname">bin</systemitem>
with a GID of 1 be present. All other group names and GIDs can be chosen
freely by the system administrator since well-written programs do not depend
on GID numbers, but rather use the group's name.</para>
with a GID of 1 be present. The GID of 5 is widely used for
<systemitem class="groupname">tty</systemitem> group, and the number 5 is
also used in <phrase revision="systemd">systemd</phrase>
<phrase revision="sysv"><filename>/etc/fstab</filename></phrase> for the
<systemitem class="filesystem">devpts</systemitem> filesystem.
All other group names and GIDs can be chosen freely by the system
administrator since well-written programs do not depend on GID numbers,
but rather use the group's name.</para>
<para>The ID 65534 is used by the kernel for NFS and separate user
namespaces for unmapped users and groups (those exist on the NFS server