How to append text to a file on a new line

Question

Why does the following Groovy code not append the "hello again" on a new line?

f = new File('myfile.txt')
f.append('hello again!\n')

This adds to myfile.txt after the last line but not on a new line. How do I append the text on a new line?

Answer 1

You should put the \n first. That way your newline will be written before your text:

f.append('\nhello again!')

Answer 2

Yet another way of doing this. In this case, you don't have to add the newline character manually

File greetingsFile = new File("myfile.txt")
greetingsFile.withWriterAppend{ out ->
    out.println 'hello again!'
}

Answer 3

Groovy's concise syntax for writing into file:

f << '\n' << 'hello again'

Answer 4

You can always get the correct new line character through

System.getProperty("line.separator")

so added it before your text