I cannot login to my raspberry after uninstalling zsh

Question

Raspberry is running fine, but I cannot login via ssh or directly on the device. Problem: I executed following command: sudo apt remove --purge zsh

Yes I know I am a moron.

I know I have to access /etc/passwd to change after my username the entry from /bin/zsh zu /bin/bash. But I cannot access this file. When I add init /bin/bash to cmdline.txt I have sort of root access. I can read but not write.

And: Booting the rasperry holding shift does not bring me to the boot menu

Anyone can help me?

• Seamus: re-install? ...
• jsotola: Anyone can help me? is not a question about the problem
• Milliways: What OS? What did you ACTUALLY do? There is no need to purge ANYTHING; you can have multiple shells and use for different purposes. There are methods to login to a root shell and repair but you easiest option would be to reinstall.
• Milliways: I don't know where you found the strange things you tried - do not blindly follow stuff you find; most of it is wrong.
• Jaromanda X: I can read but not write - I guess / is mounted readonly - you could mount / -o remount,rw to make it writable

Answer 1

Rebooting to a root shell can repair most configuration problems on the Pi.

1. Append init=/bin/sh at the end of cmdline.txt and reboot.
2. After booting you will be at the prompt in a root shell.
3. Your root file system is mounted as readonly now, so remount it as read/write
   mount -n -o remount,rw /
4. Edit to fix your problem.
5. Remove init=/bin/sh and reboot.

NOTE you should use init=/bin/sh NOT init=/bin/bash as this is guaranteed to exist.
On Debian /bin/sh is actually a link to /bin/dash