Batch / Find And Edit Lines in TXT file

Question

I want to create a batch while which finds specific lines in a batch file and are able to edit these lines.

Example:

//TXT FILE//

ex1
ex2
ex3
ex4

i want to let the batch file find 'ex3' and edit this to 'ex5' to let it look like this:

ex1
ex2
ex5
ex4

Answer 1

On a native Windows install, you can either use batch(cmd.exe) or vbscript without the need to get external tools. Here's an example in vbscript:

Set objFS = CreateObject("Scripting.FileSystemObject")
strFile = "c:estfile.txt"
Set objFile = objFS.OpenTextFile(strFile)
Do Until objFile.AtEndOfStream
    strLine = objFile.ReadLine
    If InStr(strLine,"ex3")> 0 Then
        strLine = Replace(strLine,"ex3","ex5")
    End If 
    WScript.Echo strLine
Loop    

Save as myreplace.vbs and on the command line:

c:est> cscript /nologo myreplace.vbs  > newfile
c:est> ren newfile file.txt