[linux] How to grep a string that do no cantain another substring?

How to grep a string that do no cantain another substring?

There is the solution:

$ ls | grep -ivE 'unimous'

Here is a practical example of using it. If you want to find all the files with names containing 'wireshark' and without 'unimous', and then delete all of them:

$ sudo updatedb
$ locate wireshark | grep -viE 'unimous' | xargs sudo rm -rf