Reference

Reference#

Quick Command Reference#

Basic SSH Commands#

# Connect to a server
ssh username@hostname

# Connect with verbose output (for debugging)
ssh -v username@hostname

# Copy file to remote server
scp localfile username@hostname:/remote/path/

# Copy file from remote server
scp username@hostname:/remote/path/file localfile

# Copy directory recursively
scp -r localdirectory username@hostname:/remote/path/

SSH Key Management#

# Generate a new SSH key pair
ssh-keygen -C "Comment for your key"

# Copy public key to server
ssh-copy-id -i ~/.ssh/id_rsa username@hostname

# Start ssh-agent
eval "$(ssh-agent -s)"

# Add key to ssh-agent
ssh-add ~/.ssh/id_rsa

# List keys in ssh-agent
ssh-add -l

# Remove host from known_hosts
ssh-keygen -R hostname

Port Forwarding#

# Local port forwarding
ssh -L localport:remotehost:remoteport username@hostname

# Example: Access remote Jupyter notebook
ssh -L 8080:localhost:8080 username@hostname

Useful Tools#

# Synchronize directories with rsync
rsync -vaz source/ destination/

# Start tmux session
tmux

# List tmux sessions
tmux ls

# Attach to tmux session
tmux attach

# Detach from tmux
Ctrl-b d

Configuration File Location#

SSH configuration file: ~/.ssh/config

Authorized keys file: ~/.ssh/authorized_keys

Known hosts file: ~/.ssh/known_hosts

Common SSH Config Options#

Host nickname
    HostName full.hostname.com
    User yourusername
    Port 22
    IdentityFile ~/.ssh/id_rsa
    IdentitiesOnly yes
    ForwardAgent yes
    ProxyJump gateway.host.com
    ServerAliveInterval 60
    Compression yes

Resources#