Computer Hope

hi  to  all  i  have a  text file  that  contain an  ip  but  should  be  update  every day  for  an vpn  how  can  i replace  this  ip  in  a txt  file  with   another  one

my ip.txt  file  contain  this

Quote192.168.233.188       4e-53-d0-68-34-bf     dynamic   
(@ECHO OFF
ECHO Configuring Proxy Settings please wait...
REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v ProxyEnable /t REG_DWORD /d 1 /f
REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v ProxyServer /t REG_SZ /d  192.168.158.134:8080 /f
EXIT

i  want first  line (192.168.233.188) just  this  one replace  with  ip  in  5th  line  (192.168.158.134)

attention==  first  line  ip  will  change  every  day

how  can  i do  it  can  you  help?

i  batch  script  could  be  very  nice
thanks

Hi !
First question : How did you get the ip and save it into config.txt ?
EDIT :
If I presume that you get the IP from the command line ARP -A in the first line
You can do something like that without using the config.txt
@echo off
Title Change VPN Settings
for /f "tokens=2" %%a in ('arp -a ^| findstr /i "\<Interface\>"') do set IP=%%a
echo The IP address is %IP%
pause
ECHO Configuring Proxy Settings please wait...
ECHO REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v ProxyEnable /t REG_DWORD /d 1 /f
ECHO REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v ProxyServer /t REG_SZ /d  %IP%:8080 /f
pause
Note : I added the command ECHO To be sure if the IP is correct, then you can remove every ECHO before the command REG ADD

thanks  dear Hackoo
your  cod is  working  but i  am  using  vpn from my  mobile  phone  for  my  laptop  pc  so 
i get  my  new  ip in  this  way

Quote@echo off
REM clear arp cache (optional):
arp -d
REM ask everybody on the subnet for a response:
for /l %%a in (1,1,255) do start /b ping -n 2 -w 500 192.168.1.%%a >nul
REM wait for the processes to finish:
timeout 2 >nul
REM show the responses (with IP and MAC):
arp -a>mynew-ip.txt
pause

in  mynew-ip.txt  i  have this
Interface: 192.168.11.181 --- 0xc
  Internet Address      Physical Address      Type
  192.168.11.49           4e-53-d0-68-34-bf     dynamic   

192.168.11.49==== is  my  new  working  ip  that  i  need  every  day so  you  should  use this  ip  in  your  cod

if  its  complicated  and  time  consuming  just  answer  my  question  in  first  post  of  this  topic  and  i will  solve  the  other  parts  with  external  aps  automatically
just  replace  first  line  ip  in  post #1 with  old  ip in  5th  line
thanks

Give a try for this code, and tell me how it works on your side ?
@echo off
for /f "tokens=1" %%a in ('findstr "192.168.11." mynew-ip.txt') do set IP=%%a
echo The new working IP is %IP%
pause

when  i  run  this  in  a  .bat file  just stayed  on  this  blank  screen

QuoteThe new working IP is
Press any key to continue . . .

after ip  is  empty
actually  my  internet  ip  is  in  mynew-ip.txt  in  the first  line  of the  file  and stored  next  to  this  .bat  file  in  current  window

Quote192.168.233.188       4e-53-d0-68-34-bf     dynamic