Reword explanation of GROUP parameter in /etc/default/useradd

Tell that 999 comes from the --gid parameter, and that we already have
a group "users" with this gid to prevent messages when first using useradd.

1 files changed, 12 insertions, 6 deletions

diff --git a/chapter08/shadow.xml b/chapter08/shadow.xml
index b6587e0b1..810e77969 100644
--- a/chapter08/shadow.xml
+++ b/chapter08/shadow.xml
@@ -188,6 +188,7 @@ make -C man install-man</userinput></screen>
     <para>Second, to change the default parameters, the file
     <filename>/etc/default/useradd</filename> needs to be created and taylored
     to suit your particular needs. Create it with:</para>
+
 <screen><userinput>mkdir -p /etc/default
 useradd -D --gid 999</userinput></screen>
 
@@ -198,15 +199,20 @@ useradd -D --gid 999</userinput></screen>
         <term><parameter>GROUP=999</parameter></term>
         <listitem>
           <para>This parameter sets the beginning of the group numbers used in
-          the /etc/group file. You can modify it to anything you desire. Note
-          that <command>useradd</command> will never reuse a UID or GID. If the
+          the <filename>/etc/group</filename> file. The particular value 999
+          comes from the <parameter>--gid</parameter> parameter above.
+          You can modify it to anything you desire. Note that
+          <command>useradd</command> will never reuse a UID or GID. If the
           number identified in this parameter is used, it will use the next
-          available number after this. Note also that if you don't have a group
-          1000 on your system the first time you use <command>useradd</command>
+          available number after this. Note also that if you don't have a
+          group with an ID equal to this number on your system the first
+          time you use <command>useradd</command>
           without the <parameter>-g</parameter> parameter, you'll get a message
           displayed on the terminal that says:
-          <computeroutput>useradd: unknown GID 1000</computeroutput>. You may
-          disregard this message and group number 1000 will be used.</para>
+          <computeroutput>useradd: unknown GID 999</computeroutput>, although
+          the account is correctly created. That is
+          why we have earlier created the group <parameter>users</parameter>
+          with this group ID.</para>
         </listitem>
       </varlistentry>
       <varlistentry>