I need to replace existing sshd config on the remote PC and restart sshd, so I try to use this:cat /sshd_cfg | ssh user@192.168.0.47 cat > /etc/ssh/sshd_config && service sshd restartbut I get bash: /etc/ssh/sshd_config: Permission Denied So to use sudo I try echo pass | sudo -S like that: cat /sshd_cfg | ssh user@192.168.0.47 echo pass | sudo -S cat > /etc/ssh/sshd_config && service sshd restartbut getting the same output - Permission Denied, may be because of pipes collision? What shall I do?Linux 190 4.3.0-2-generic #11-Ubuntu SMP Fri Dec 4 20:36:35 UTC 2015 i686 i686 i686 GNU/Linux**updAs I found, the problem is in user privileges.If I connect directly to PC and try to execute sudo cat /dev/null > /etc/ssh/sshd_config, I get Permission Denied, but it' okay If I try sudo -H -u root bash -c 'cat /dev/null > /etc/ssh/sshd_config'.So I tried that from remote: cat /sshd_cfg | ssh user@IP echo password | sudo -S -H -u root bash -c 'cat > /etc/ssh/sshd_config'And this time no errors appeares. And the file was changed, but it became ...blank. Instead cating /sshd_cfg in it.Why? 
How to send sudo password over pipe?
ubuntu;ssh;sudo;pipe;sshd