ssh.md

SSH

Commands

ssh-keygen -t rsa -b 4096 -C "your_email@example.com"  
cat ~/.ssh/id_rsa.pub  
ssh-rsa BBBB3NzaC1yc2EAAA...  
ssh john@1.2.3.4  
ssh integra  
#check  
awk '{print $2}' ssh_host_rsa_key.pub | base64 -d | sha256sum -b | awk '{print $1}' | xxd -r -p | base64  
  
scp username@hostname:/path/to/remote/file /path/to/local/file  
  
/etc/ssh/ssh_config  
Protocol 2  
  
groupadd sshusers  
usermod -a -G sshusers agi  
AllowGroups sshusers  

SCP

Syntax:

scp <source> <destination>

To copy a file from B to A while logged into B:

scp /path/to/file username@a:/path/to/destination

To copy a file from B to A while logged into A:

scp username@b:/path/to/file /path/to/destination

Config

config in ~ /.ssh/config and /etc/ssh/ssh_config
dcit

Host integra  
Hostname integra.dcit.cz  
User krnak  
Host tatra  
Hostname tatra.dcit.cz  
User krnak  
Host tatraSocks  
Hostname tatra.dcit.cz  
User krnak  
DynamicForward 1080  
Port 22  

Bad owner or permissions on /home/agi/.ssh/config

chown $USER ~/.ssh/config  
chmod 600 ~/.ssh/config  

gimli

Host gimli  
Hostname gimli.ms.mff.cuni.cz  
User krnak