I want to restrict a user to do sftp to a particular directory in raspberry pi os but after successfully doing that i am unable to do ssh.

i have edited etc/ssh/sshd_config This is the configuration i have inserted in config file

Allowed Users admin
Subsystem sftp /usr/lib/openssh/sftp-server
Match User admin
ForceCommand internal-sftp -d /update
PermitTunnel no
AllowAgentForwarding no
AllowTcpForwarding no
X11Forwarding no

How to restrict sftp to a particular directory but ssh should also work......

It is trivial to restrict a user to STP only. IT is trivial to restrict a user to a particular directory for both sftp and ssh.

It is unclear exactly what you want, but if you want ssh shell access unrestricted and file transfer restricted to a single tree, that is "interesting"! I cannot image why you would want such an odd animal, but I have a solution: it involves two listeners and ssh installations rather than one: with different configurations. SSH running on one port (22?) with sftp/scp blocked or disabled, and ssh restricted to a single folder and allowing ONLY sftp on a different port. This requires some manual duplication or linking of the key structures, or running two processes from the same install with very different command-lines and different sshd.conf files. (sshd.conf and sshd2.conf? Whatever.)

There may be another way. No, there are MANY other ways, I just cannot think of them right now. One would be to run OpenSSH (sshd) with a config that does not enable sftp, but run an ftp client that supports sftp sessions using that applications config and restrictions.

Of note, most people who want to restrict sftp also want to restrict or disable ssh sessions. This is actually BACKWARD to the normal cases!

If I have misunderstood, and I HOPE I have, please provide correction and clarification.

check out this link if this is what you need: https://www.golinuxcloud.com/sftp-ch...fic-directory/

Below is from link above, I believe this is where the magic happens. Of course, other steps mentioned should not be missed.