command

ls -v *.jpg | cat -n | while read n f; do mv -n "$f" "$n.jpg"; done 

original content

drwxrwxr-x 55 chchang chchang    4096 Jun 28 09:58 ..
-rw-rw-r--  1 chchang chchang     177 Jun 28 09:59 README.md
-rw-rw-r--  1 chchang chchang 2502568 Jun 28 09:59 alexandra-gornago-LrrADFcX80w-unsplash.jpg
-rw-rw-r--  1 chchang chchang  922144 Jun 28 09:59 douglas-sheppard-9rYfG8sWRVo-unsplash.jpg
-rwxrwxr-x  1 chchang chchang 4462392 Jun 28 09:59 imagebed-github
-rw-rw-r--  1 chchang chchang 9928644 Jun 28 09:59 jared-rice-PibraWHb4h8-unsplash.jpg
-rw-rw-r--  1 chchang chchang 1343682 Jun 28 09:59 jeroen-van-pelt-G0uQHBfLTpM-unsplash.jpg
-rw-rw-r--  1 chchang chchang 1591471 Jun 28 09:59 kam-idris-kyt0PkBSCNQ-unsplash.jpg
-rw-rw-r--  1 chchang chchang 1153212 Jun 28 09:59 jorge-de-jorge-NvqYkDPE0Rw-unsplash.jpg
-rw-rw-r--  1 chchang chchang 1772826 Jun 28 09:59 kara-eads-L7EwHkq1B2s-unsplash.jpg
-rw-rw-r--  1 chchang chchang 2124668 Jun 28 09:59 minh-pham-OtXADkUh3-I-unsplash.jpg
-rw-rw-r--  1 chchang chchang 1600904 Jun 28 09:59 norbert-levajsics-oTJ92KUXHls-unsplash.jpg
-rw-rw-r--  1 chchang chchang 1553633 Jun 28 09:59 roberto-nickson-emqnSQwQQDo-unsplash.jpg
-rw-rw-r--  1 chchang chchang 1640260 Jun 28 09:59 roberto-nickson-tleCJiDOri0-unsplash.jpg
-rw-rw-r--  1 chchang chchang 2143834 Jun 28 09:59 sam-moqadam-cU5TUyEaZXQ-unsplash.jpg
-rw-rw-r--  1 chchang chchang 2123133 Jun 28 09:59 sherry-christian-8Myh76_3M2U-unsplash.jpg
-rw-rw-r--  1 chchang chchang  756974 Jun 28 09:59 vinicius-amnx-amano-17NCG_wOkMY-unsplash.jpg
drwxrwxr-x  3 chchang chchang    4096 Jun 28 10:00 .
drwxrwxr-x  8 chchang chchang    4096 Jun 28 10:00 .git

after command

chchang@hqdc039:~/git/imagebed$ ls -lart
總用量 34828
drwxrwxr-x 55 chchang chchang    4096 Jun 28 09:58 ..
-rw-rw-r--  1 chchang chchang     177 Jun 28 09:59 1.jpg
-rw-rw-r--  1 chchang chchang 2502568 Jun 28 09:59 2.jpg
-rw-rw-r--  1 chchang chchang  922144 Jun 28 09:59 3.jpg
-rwxrwxr-x  1 chchang chchang 4462392 Jun 28 09:59 imagebed-github
-rw-rw-r--  1 chchang chchang 9928644 Jun 28 09:59 4.jpg
-rw-rw-r--  1 chchang chchang 1343682 Jun 28 09:59 5.jpg
-rw-rw-r--  1 chchang chchang 1591471 Jun 28 09:59 7.jpg
-rw-rw-r--  1 chchang chchang 1153212 Jun 28 09:59 6.jpg
-rw-rw-r--  1 chchang chchang 1772826 Jun 28 09:59 8.jpg
-rw-rw-r--  1 chchang chchang 2124668 Jun 28 09:59 9.jpg
-rw-rw-r--  1 chchang chchang 1600904 Jun 28 09:59 10.jpg
-rw-rw-r--  1 chchang chchang 1553633 Jun 28 09:59 11.jpg
-rw-rw-r--  1 chchang chchang 1640260 Jun 28 09:59 12.jpg
-rw-rw-r--  1 chchang chchang 2143834 Jun 28 09:59 13.jpg
-rw-rw-r--  1 chchang chchang 2123133 Jun 28 09:59 14.jpg
-rw-rw-r--  1 chchang chchang  756974 Jun 28 09:59 15.jpg
drwxrwxr-x  8 chchang chchang    4096 Jun 28 10:00 .git
drwxrwxr-x  3 chchang chchang    4096 Jun 28 10:03 .
chchang@hqdc039:~/git/imagebed$