Add to file if exists and create if not

Question

I am working on a bash script that needs to take a single line and add it to the end of a file if it exists, and if it does not exist create the file with the line.

I have so far:

if [ ! -e /path/to/file ]; then
    echo $some_line > /path/to/file
else
    ???
fi

How do I perform the operation that should go in the else (adding the line of text to the existing file)?

Answer 1

Use two angles: echo $some_line >> /path/to/file

Answer 2

with > this creates file if it doesn't exist. If it exits, overwrites

with >> this creates file if it doesn't exist. If it exits, appends to the file

if [ ! -e /path/to/file ]; then
   echo $some_line > /path/to/file
else
   echo $some_line >> /path/to/file
fi