btw there is a bash feature that you can use for this touch a_tset_file.txt mv a_t{se,es}t_file.txt it works for changing file extensions: touch foo.txt mv f

btw there is a bash feature that you can use for this touch a_tset_file.txt mv a_t{se,es}t_file.txt it works for changing file extensions: touch foo.txt mv foo.{txt,json} or for adding or removing characters, just leave the other side of the comma empty touch foo.txt mv foo{,bar}.txt mv foo{bar,}.txt