IF EXIST [string in file] THEN [command]

[alleypuppy]

I'm making a batch file that will add a string to a file of it doesn't exist in that file. Is this possible?

[Batcher]

Code: Select all

findstr /c:"hello world" a.txt || echo hello world >>a.txt

[dbenham]

The above works, but you probably don't want to see the FINDSTR output if the string already exists. So we just redirect output to NUL:

Code: Select all

findstr /c:"hello world" a.txt >nul || echo hello world >>a.txt

Dave Benham