code:

---

BREAK ON CLS

:hostsinstall
If (@inwin = 1)
$windir = READVALUE("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion","SystemRoot")
       $hostsdir = $windir + "\SYSTEM32\DRIVERS\ETC"
       $hostsdirfile = $windir + "\SYSTEM32\DRIVERS\ETC\LMHOSTS"
ELSE
       $windir = READVALUE("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion","SystemRoot")
       $hostsdir = $windir
       $hostsdirfile = $windir + "\HOSTS"
ENDIF

 ;This is setup with IP Address and Alias of the Server
 $ipalias = "1.2.3.4"+chr(9)+chr(9)+"installs"
 $eol = Chr(13)+Chr(10)
 $result = 1
 IF exist($hostsdirfile)
       $result = open( 1 , $hostsdirfile )
 ELSE
       IF exist($hostsdirfile)
             $result = open( 1 , $hostsdirfile )
       ELSE
             ;BEEP
             ;You could XCOPY a "pre-canned" HOSTS file from a NETLOGON share on the next line instead of an error message
             COPY @ldrive+"HOSTS" $hostsdir
             ;? "Sorry, the HOSTS file appears to be missing."
             ;Comment out the next COMMAND line to create the HOSTS file anyway
             GOTO OUTPUT1
       ENDIF
 ENDIF

 IF $result = 0
       $line = readline( 1 )
       WHILE @error = 0
             $line = readline( 1 )
             ;We are going to compare the $line and $IPALIAS
             IF $line = $ipalias
                   ;Uncomment out the next line to turn on visual results.
                   ;$EDITRESULT = 'The hosts line you were looking for is already there, no mods were made.'
                   GOTO OUTPUT
             ELSE
                   ;Uncomment out the next line to turn on visual results.
                   ;$EDITRESULT = 'We added the hosts line for you - ' + $IPALIAS
             ENDIF
       LOOP
       $result = close( 1 )
 ELSE
       ;BEEP
       ;You could XCOPY a "pre-canned" HOSTS file from a NETLOGON share on the next line instead of an error message
       COPY @ldrive+"HOSTS" $hostsdir
       ;? "Sorry, failed to open HOSTS, errorcode : [" + @ERROR + "]"
       ;Comment out the next COMMAND line to create the HOSTS file anyway
       GOTO OUTPUT1
 ENDIF

:output
 ;We need to check for the existence of the $IPALIAS and if it not found add in the line
 ;Uncomment out the next line to turn on visual results.
 ;? $EDITRESULT SLEEP 3
 ;IF $EDITRESULT = 'N'
 $result = 2
 IF Open(2,$hostsdirfile,5) = 0
       $o = WriteLine(2,$ipalias+$eol)
 ENDIF
 IF close(2) = 0
 ENDIF
 ;Make sure the 1st file is closed
 $result = close( 1 )
 RETURN

:output1
 ;Make sure the 1st file is closed
 $result = close( 1 )
 RETURN

---