Hello i am new with UNIX and needed help with my search. I need to find a file that starts with 'f' than has unknown number of numbers then has 'gr' and ends with large letters also unknown number and unknown extension. ex. f123456grKNI, f11223grKE
Thank you up front
With gnu find, you can try
find . -regextype posix-extended -regex '.*/f[0-9]+gr[A-Z]+\.?.*'