Question

I got a lot of files whose names are like this:

tmp1.csv
tmp32.csv
tmp9.csv
tmp76.csv
...

They are in the same dir, and I want to extract the numbers in the file name. How can I do that in bash?

PS

I tried grep, but can’t make it. Also I tried ${filename##[a-z]}. Are they the right way to go?

Answer 1

for f in *.csv; do echo $f | egrep -o "[0-9]+" ; done

If you have other csv file with digits in their filenames use:

for f in *.csv; do echo $f | sed -re 's/^tmp([0-9]+)\.csv$/\1/' ; done