search files in current directory whose name do not contain "txt" in linux

Question

I know how to find files with suffix .txt in the current directory: find *.txt

How do I invert this?

I am new to Linux, so please help. Thanks!

Answer 1

If you just want the current directory, and your shell is bash:

shopt -s extglob
ls !(*.txt)

reference

Answer 2

find ! -name  "*.txt"

or

find -not -name "*.txt"

Answer 3

find in current file not recursive

find -maxdepth 1 ! -name "*.txt"