Shell Programming and Scripting

0ne way:
cat myfile.txt | awk '{print $9}' | cut -c4-8 | while read number
do
       echo "${number}"
done

Or if you prefer redirection to cat:
cat myfile.txt | awk '{print $9}' | cut -c4-8 | while read number
do
       echo "${number}"
done < myfile.txt

Or we could read the file directly with "awk":
awk '{print $9}' myfile.txt| cut -c4-8 | while read number
do
       echo "${number}"
done

$ ruby -ne 'puts $_[-6..-1]' file
23456
23457
23458
23459
23460

cut -c 40- yourfile | while read line ; do ; echo "num=$line" ; done

$
$ cat f27
-rw-r----- 1 321 321 0 Oct 14 10:41 xcv23456
-rw-r----- 1 321 321 0 Oct 14 10:41 xcv23457
-rw-r----- 1 321 321 0 Oct 14 10:41 xcv23458
-rw-r----- 1 321 321 0 Oct 14 12:19 xcv23459
-rw-r----- 1 321 321 0 Oct 15 11:19 xcv23460
$
$
$ perl -plne 's/^.*(.{5})$/$1/' f27
23456
23457
23458
23459
23460
$
$
$ perl -plne '$_=substr($_,-5)' f27
23456
23457
23458
23459
23460
$
$