Citando o manual para ls
:
NAME
ls -- list directory contents
SYNOPSIS
ls [-ABCFGHLOPRSTUW@abcdefghiklmnopqrstuwx1] [file ...]
-l (The lowercase letter ''ell''.) List in long format. (See below.) If the output is to a ter-minal, terminal,
minal, a total sum for all the file sizes is output on a line before the long listing.
-u Use time of last access, instead of last modification of the file for sorting (-t) or long
printing (-l).
-t Sort by time modified (most recently modified first) before sorting the operands by lexico-graphical lexicographical
graphical order.
Dito isto, ls -lut
fará o trabalho por você.
Manual