Question

I’m trying to determine if a file or directory doesn’t exist. I tried the following commands to see if a file does exist and they work correctly:

if [ -a 'settings.py' ]; then echo 'exists'; fi
exists #output
if [ -a 'foo' ]; then echo 'exists'; fi #outputs nothing

But when I try this:

if [ ! -a 'settings.py' ]; then echo 'does not exist'; fi
does not exist #shouldn't be output since the file does exist
if [ ! -a 'foo' ]; then echo 'does not exist'; fi
does not exist

‘does not exist’ is output no matter what.

Answer 1

Try using -e in place of -a

This page on the Linux Documentation Project says:

-a is identical in effect to -e. But it has been deprecated, and its use is discouraged.