Sorting and extracting of dirnames

There are a lot of directories named like

web001

web开发者_运维技巧002

...

web123

...

I want to extract a max-number from this set...

Something like num="´find -name /dirname sort ... | tail´" with extracting. I have no ideas...

Thank you

You can use tr -dc [0-9] to get rid of all non-numbers. Note that this also gets rid of the newline but if you extract just a single line with tail, that does not matter.

If you want just the number:

find -type d -name web\* | sort | tail -n 1 | cut -d'b' -f2

ls | sort | tail -n 1

Will tell you what the last folder sorted alphabetically is