There are no empty lines in your input.

Ah, I see now. Eliminating empty lines was not a requirement, although the OP wasn't clear about that, since the convoluted sed | awk construct in fact did remove all empty lines, even those wanted. The perl script doesn't, however. The sed | awk was there for illustration purposes alone.

The l script is meant to include empty lines of input. Sorry for the unclear spec.

perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'

In reply to Re^6: extract (a range of) numbered lines from a file by shmem
in thread extract (a range of) numbered lines from a file by shmem

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