Hello,

I have a file like this:
BBR 0029011 090 L $$ap. lea
BBR 0030170 090 L $$aEJOURNAL-ACADEMIC SEARCH
BBR 0030170 090 L $$aEJOURNAL-PROQUEST
BBR 0030453 090 L $$ap. jou
BBR 0030453 090 L $$aEJOURNAL-ACADEMIC SEARCH
BBR 0030453 090 L $$aEJOURNAL-PROQUEST
BBR 0030577 090 L $$ap. cri

I would like to delete lines (gradually) first, line1,4,7
then lines 2, 5
Is there any script or command to do il globally , the file is huge.

Many thanks

you can write a small script like:

cat nos
1
4
7
2
5

for i in `cat nos`;
do sed -e "$i/d/"
done;

Not sure of the syntax.