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Linux has seq
seq -f %010.0f 0 9999999999You can pipe this into a while loop.
On Unix systems you can do it with awk
awk 'BEGIN {for (i=0;i<=9999999999;i++) printf "%010.0f\n",i}'

Through Sed..
sed 's/^/000/' inputfile

Will this work for you?
awk ' { print "000" $0; } ' number.txt

No need to call external utilities such as seq. The following works for ksh93 and bash.

for i in {0..999}
do
printf "%03d\n" $i
done

or even simpler

printf "%03d\n" {0..999}