sl: a mirror version of ls

Ever heard of the Steam Locomotive? It is supposed to cure your bad habit of mistyping [ls] by running an ASCII rendition of a steam locomotive through your terminal.

I didn't like it and made another program of the same name. My sl just mirrors the output of ls. It accepts most ls(1) arguments and is best enjoyed with -l.

#!/bin/bash
# sl - prints a mirror image of ls. (C) 2017 Tobias Girstmair, https://gir.st/, GPLv3

LEN=$(ls "$@" |wc -L) # get the length of the longest line

ls "$@" | rev | while read -r line
do
	printf "%${LEN}.${LEN}s\\n" "$line" | sed 's/^\(\s\+\)\(\S\+\)/\2\1/'
done

Here's an example:

13:37 t@hostname: /tmp/jpvtx-0.2.1 % sl -l                       [0]
67                                            latot
2              60:40 91 raM 02893 t t 2 .x-rx-rxwrd
tuo.a          55:51 91 raM 6738  t t 1 .x-rx-rxwr-
SEGNAHC        5002  22 yaM 603   t t 1 .--r--r-wr-
c.xtvpj        5002  22 yaM 7909  t t 1 .--r--r-wr-
ESNECIL        5002  22 yaM 67971 t t 1 .--r--r-wr-
elifekaM       5002  22 yaM 131   t t 1 .--r--r-wr-
EMDAER         5002  22 yaM 795   t t 1 .--r--r-wr-
h.selbat       5002  22 yaM 0153  t t 1 .--r--r-wr-
c.xtv          35:51 91 raM 3507  t t 1 .--r--r-wr-
c.iicsa_ot_xtv 41:61 91 raM 6265  t t 1 .--r--r-wr-

13:37 t@hostname: /tmp/jpvtx-0.2.1 % ls -l                       [0]
total 76
drwxr-xr-x. 2 t t 39820 Mar 19 04:06 2
-rwxr-xr-x. 1 t t  8376 Mar 19 15:55 a.out
-rw-r--r--. 1 t t   306 May 22  2005 CHANGES
-rw-r--r--. 1 t t  9097 May 22  2005 jpvtx.c
-rw-r--r--. 1 t t 17976 May 22  2005 LICENSE
-rw-r--r--. 1 t t   131 May 22  2005 Makefile
-rw-r--r--. 1 t t   597 May 22  2005 README
-rw-r--r--. 1 t t  3510 May 22  2005 tables.h
-rw-r--r--. 1 t t  7053 Mar 19 15:53 vtx.c
-rw-r--r--. 1 t t  5626 Mar 19 16:14 vtx_to_ascii.c
13:37 t@hostname: /tmp/jpvtx-0.2.1 %                             [0]

Consider this code GPLv3 licensed.