CODEWITHSUNDEEP
windowsbatch-filehosts
Alykoff Gali
Alykoff Gali

Reputation: 1221

In BAT file script, add new line in FILE if FILE doesn't contain that line

I want to add one line in hosts file:

127.0.0.1       new-host

if it doesn't contain this line.

In windows use bat scripting.

Example 1

before script:

127.0.0.1       db
127.0.0.1       host

after script:

127.0.0.1       db
127.0.0.1       host
127.0.0.1       new-host

Example 2

before script:

127.0.0.1       db
127.0.0.1       host
127.0.0.1       new-host

after script:

127.0.0.1       db
127.0.0.1       host
127.0.0.1       new-host

My code:

for /f "delims=" %%i in ('findstr /c:"new-host" "c:\Windows\System32\Drivers\etc\hosts"') do set actualLineHost=%%i
echo %actualLineHost%

if "%actualLineHost:"=.%"==".." (
    echo empty
    goto empty
) else (
    echo not empty
    goto notempty
)

findstr /c:"new-host" "c:\Windows\System32\Drivers\etc\hosts" works fine in command line returns nothing, but when I run a script a have "not empty" when file doesn't contain line.

Upvotes: 0

Views: 460

Answers (2)

Alykoff Gali
Alykoff Gali

Reputation: 1221

Solution without using errorlevel

for /f "delims=" %%i in ('findstr /c:"new-host" "c:\Windows\System32\Drivers\etc\hosts"') do goto hostContains
echo 127.0.0.1       new-host >> c:\Windows\System32\Drivers\etc\hosts
echo "Not found"
goto exit

:hostContains
echo "Found"
:exit

Upvotes: 0

Léo R.
Léo R.

Reputation: 2698

Try this code :

@echo off
findstr /m "new-host" C:\Windows\System32\drivers\etc\hosts
if %errorlevel%==0 (
echo Found!
) else (
echo No matches found
echo 127.0.0.1       new-host >> C:\Windows\System32\drivers\etc\hosts
)
pause

This will launch findstr cmd to search one (or more ) define string in a file, after this, we check if command return error or not, is there is no error, we made an echo to write the line in the file ( >> is for going new line )

Upvotes: 2

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