find command:https://www.howtouselinux.com/post/find-file-by-name-in-linux
# Use find command, find all *.txt files but ignore foo.txt
 find . -type f \( -iname "*.txt" ! -iname "foo.txt" \)
# To delete file add -delete or -exec your-delete-command-here option.
 find . -type f \( -iname "*.txt" ! -iname "foo.txt" \) -delete
# To select folder or dirs use -type d, in this example, find all folders and ignore foo and bar folder :
 find . -type d \( ! -iname "foo" ! -iname "bar" \)
# To delete folders except foo and bar
 find . -type d \( ! -iname "foo" ! -iname "bar" \) -execdir rm -rfv {} +
# Be careful while deleting files and dirs.