pmap grep zero fail to load vm_peak

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/12/kernel-resources.html
Description:

pmap 4170 | awk '/rw-s/ && /zero/ {print $2}'

is not working
if I Do
pmap 4170 | awk '/rw-s/ && /zero/ {print $2}'
I get
00002aaaaac00000 1099776K rw-s- anon_hugepage (deleted)
00007f4fb934f000 16K rw-s- PostgreSQL.788243545
00007f4fb9353000 4K rw-s- [ shmid=0x11 ]

What is zero is not coming instead anon_hugepage is coming
Can you please provide me a Command that that I can use with can work with
diff compute
4 GB
8 GB
16 GB
32 GB