UNIX for Dummies Questions & Answers

As I'm a perfect newbie, I was searching for some sites explaining the elements for declaring different parts of a name. It's much easier to find the "classic" description of letters, digits, non digits, etc.

Your 2 scripts (based upon the underscore or upon letters/digits) are perfect and I thank you very much Scrutinizer for giving some time and attention!

You're welcome! Here is a link describing parameter expansion, in case you had not found that already.

Oh yes, exactly what I needed for understanding the scripts; I didn't find anything about the meaning of %% and ##. Now I've got a lot to do! I'm gonna read that. Thank's!

---------- Post updated at 01:37 AM ---------- Previous update was at 01:34 AM ----------

So that one doesn't have to adapt the script to the first number of the photos, it's better to add the 3 first lines:

Code:

echo -n "Enter the number of the first photo: "
read num
ls | while read name
do
  ext=${name##*.}
  first=${name%.*}
  pre=${first%%[0-9]*}
  nr=${first##*[^0-9]}
  newnr=$(printf "%03d" $((nr-num+1)))
  mv "$name" "${pre}${newnr}.${ext}"
done