Difference between 'if -e' and 'if -f'

Question

There are two switches for the if condition which check for a file: -e and -f.

What is the difference between those two?

Answer 1

The if statement actually uses the program 'test' for the tests. You could write if statements two ways:

if [ -e filename ];

or

if test -e filename;

If you know this, you can easily check the man page for 'test' to find out the meanings of the different tests:

man test