How can I undo this one my phone which is Huawei p8 lite 2017. This is the error I'm getting

When FILE is '-', read standard input. With no FILE, read '.' if

recursive, '-' otherwise. With fewer than two FILEs, assume -h.

Exit status is 0 if any line is selected, 1 otherwise;

if any error occurs and -q is not given, the exit status is 2.

Kind regards

Belinda