How do I remove newlines from a text file?

Question

I have the following data, and I need to put it all into one line.

I have this:

22791

;

14336

;

22821

;

34653

;

21491

;

25522

;

33238

;
         


        

Answer 1

To also remove the trailing newline at the end of the file

python -c "s=open('filename','r').read();open('filename', 'w').write(s.replace('\n',''))"