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$ lsb_release -a
No LSB modules are available.
Distributor ID:    Ubuntu
...
Release:    20.04
Codename:    focal
$

 ls | perl -nle 'BEGIN {$counter=0}; $old=$_;$new="image"."$counter"."
+.jpg";
+rename($old,$new);$counter++;' 
$

$ ls | perl -nle 'BEGIN {$counter=0}; $old=$_;$new="image"."$counter".
+"jpg";
> +rename($old,$new);$counter++;' 
$ ls | perl -nle 'BEGIN {$counter=0}; $old=$_;$new="image"."$counter".
+".jpg";
+rename($old,$new);$counter++;' 
$

$ pwd
/home/hogan/6.scripts.personal/1.umatilla.1./template_stuff/aimages
$ ls
...
image10.jpg  image13.jpg  image1.jpg   image4.jpg  image7.jpg
image11.jpg  image14.jpg  image2.jpg   image5.jpg  image8.jpg
$

ls | perl -nle 'BEGIN {$counter=0}; $old=$_;$new="caption"."$counter".
+".txt";
+rename($old,$new);$counter++;'

$ pwd
/home/hogan/6.scripts.personal/1.umatilla.1./template_stuff/captions
$ ls
...
caption11.txt  caption15.txt  caption4.txt  caption8.txt
caption12.txt  caption1.txt   caption5.txt  caption9.txt
$