hostreq: Minor script adjustment

- Remove an extra whitespace breaking shebang (though our instruction
  does not use the shebang).
- Adjust the regex to allow several letters after the version number,
  and match grep version to the text.
- Raise Coreutils to 7.0 (for the host requirement script itself).  It
  was released in 2008 so I don't think it's a problem.
- Add a colon after the text "Compiler check" to match "Aliases:".
- Use grep -o instead of sed to make kernel version check simpler.

chapter02/hostreqs.xml

@@ -55,7 +55,7 @@
     </listitem>
 
     <listitem>
-      <para><emphasis role="strong">Coreutils-6.9</emphasis></para>
+      <para><emphasis role="strong">Coreutils-7.0</emphasis></para>
     </listitem>
 
     <listitem>
@@ -165,7 +165,7 @@
   the ability to compile programs, run the following commands:</para>
 
 <screen role="nodump"><userinput>cat &gt; version-check.sh &lt;&lt; "EOF"
-<literal> #!/bin/bash
+<literal>#!/bin/bash
 # A script to list version numbers of critical development tools
 
 # If you have tools installed in other directories, adjust PATH here AND
@@ -185,7 +185,7 @@ ver_check()
    then 
      echo "ERROR: Cannot find $2 ($1)"; return 1; 
    fi
-   v=$($2 --version 2>&amp;1 | grep -E -o '[0-9]+\.[0-9\.]+' | head -n1)
+   v=$($2 --version 2>&amp;1 | grep -E -o '[0-9]+\.[0-9\.]+[a-z]*' | head -n1)
    if printf '%s\n' $3 $v | sort --version-sort --check &amp;>/dev/null
    then 
      printf "OK:    %-9s %-6s >= $3\n" "$1" "$v"; return 0;
@@ -197,7 +197,7 @@ ver_check()
 
 ver_kernel()
 {
-   kver=$(uname -r | sed -E 's/^([0-9\.]+).*/\1/') 
+   kver=$(uname -r | grep -E -o '[0-9\.]+')
    if printf '%s\n' $1 $kver | sort --version-sort --check &amp;>/dev/null
    then 
      printf "OK:    Linux Kernel $kver >= $1\n"; return 0;
@@ -217,7 +217,7 @@ ver_check Findutils      find     4.2.31
 ver_check Gawk           gawk     4.0.1
 ver_check GCC            gcc      5.1
 ver_check "GCC (C++)"    g++      5.1
-ver_check Grep           grep     2.6.1
+ver_check Grep           grep     2.5.1a
 ver_check Gzip           gzip     1.3.12
 ver_check M4             m4       1.4.10
 ver_check Make           make     4.0
@@ -241,7 +241,7 @@ alias_check awk GNU
 alias_check yacc Bison
 alias_check sh Bash
 
-echo "Compiler check"
+echo "Compiler check:"
 if printf "int main(){}" | g++ -x c++ -
 then echo "OK:    g++ works";
 else echo "ERROR: g++ does NOT work"; fi