linux - Bash script with fdisk -

i came across bash script expand fs after making root volume larger on ami made packer. can please explain meaning of fdisk options in heredoc?

#!/bin/bash fdisk /dev/xvda <<eeof d n p 1 1  w eeof exit 0 

thank you!

to determine these mean, @ built-in fdisk. details may differ based on implementation; mine, looks this:

command (m help): m  help:    dos (mbr)      toggle bootable flag    b   edit nested bsd disklabel    c   toggle dos compatibility flag    generic    d   delete partition    l   list known partition types    n   add new partition    p   print partition table    t   change partition type    v   verify partition table    misc    m   print menu    u   change display/entry units    x   functionality (experts only)    save & exit    w   write table disk , exit    q   quit without saving changes    create new label    g   create new empty gpt partition table    g   create new empty sgi (irix) partition table    o   create new empty dos partition table    s   create new empty sun partition table 

...so:

• d deletes partition (presumably script developed version of fdisk if there's 1 partition, there's no prompt on delete).
• n creates new partition.
  • p indicates it's primary partition being created.
  • 1 indicates should primary partition #1
  • 1 indicates should start @ sector #1
  • the following blank line accepts default end sector
• w writes changes disk.