# gunzip -c /boot/initrd.img-4.19.0-17-amd64 | cpio -i -d -H newc
--no-absolute-filenames
246741 blocks
That may not extract the full content of the initrd. It only reads
one of the concatenated CPIO archives. Also, the first archive may not
be gzipped. Also also, hard-coding the input archive format is weird;
I'd prefer to let cpio auto-detect it.
To get a full listing, either use "lsinitramfs -l", or write a command
that reads *all* of the CPIO archives, not just the first one. I'd
advise using lsinitramfs -l, because it'll be a lot easier.