How to invert a grep expression

The following grep expression successfully lists all the .exe and .html files in the current directory and sub directories.

ls -R |grep -E .*[\.exe]$\|.*[\.html]$

How do I invert this result to list those that aren't a .html or .exe instead. (That is, !=.)

Solution 1:

Use command-line option -v or --invert-match,

ls -R |grep -v -E .*[\.exe]$\|.*[\.html]$

grep -v

grep --invert-match

You can also do the same thing using find:

find . -type f \( -iname "*" ! -iname ".exe" ! -iname ".html"\)

More info here.