This post provides instructions on how to find files NOT ending in specific file extension(s) when a folder contains many many files on Linux (tested on Ubuntu and CentOS) and Mac OS.
Open a terminal, and
cd into the folder you would like to list the file extensions.
In your terminal, issue the following command :
$ find . ! \( -name "*.py" -o -name "*.exe" \)
This will list all files that are not a .py file and not a .exe file (change the file extension(s) name according to your name:)).
$ find . ! \( -name "*.exe" \)
This will list all files that are not a .exe file.
$ find . ! \( -iname "*.exe" \)
This will list all files that are not a .exe or .EXE file.
Note: -name is case sensitive while -iname is case insensitive.
For more commonly used Linux commands, check my other posts at here and here .
