Ok!

I'll try to be as precise as possible with my problem.

My usecase is that I am trying to flash a device with OpenWRT with the help of Debian netinst, amd64 image
1) I have downloaded the debian-10.7.0-amd64-netinst.iso
2) I have "burned" the ISO to a USB-stick with the Rufus utility (Windows)
3) I have booted my device with the USB-stick and are trying to do this through PuTTY (the device has no graphic card)
4) My plan was to ...

a) Boot with the USB-disk
b) Use ctrl + a + n to get a shell
c) Use wget to download the latest relevant image of OpenWRT to the Debian USB boot stick
d) Unpack the .gz image and flush the device SSD disk with the OpenWRT image with the dd command utility

---- It seems to work regarding my plan so far ---

e) Use the parted utility to resize the partition to use the whole SSD-disk
f) Use the resize2fs utility to resize the file system
g) Reboot the device and configure whatever needs to be configured in OpenWRT from there

My problem is that I can't figure out how to get the parted package to my USB-stick. It doesn't seem to be installed or accessible from that shell. I have tried to install it with the apt-get install parted command, but apt-get is not accessible from that shell.

This is probably pretty easy for you guys to solve, but I am not a linux expert, so any tips on how to proceed would be greatly appreciated.

Likely you have fdisk or cfdisk available on 'net install' .iso - you will probably need to use it.

Thank you for your answer.
I have already tried both fdisk and cfdisk.
Both just gives the message: /bin/sh: fdisk/cfdisk Not found.

:-\

Ok ... so when doing this an essential part is important.
When the Debian bootloader loads, you are supposed to boot into rescue mode to get a working set of tools available, and of course without anything being locked or in use at filesystem level.

Instead of:
install console=ttyS0,115200n8

You start it as:
rescue console=ttyS0,115200n8

The screens appear to be the same as in the installer, but they are not. After choosing language, nic and a few more things, you are asked what file system you want to use as the root file system.
You choose to not use a root file system, and after that you get a shell where parted, resize2fs and other tools are available without installing any packages.

1 members found this post helpful.