ssh_usage

SSH - USAGE

[[TOC]]

Connection

secure shell

SSH uses direct TTY access to ensure that the password is indeed issued by an interactive keyboard use.

ssh access into the remote device:

ssh <username>@<hostname/ip address>

sshpass

runs SSH in a dedicated TTY, fooling SSH into thinking it is getting the password from an interactive user.

three way for sshpass access into remote device:

1. provides password from argument

    sshpass -p <password> ssh <username>@<hostname/ip>
   

2. provides password from the 1st line of file

    sshpass -f <file> ssh <username>@<hostname/ip>
   

3. provides passrd from environment value

    sshpass -e ssh <username>@<hostname/ip>
   

more reference: sshpass usage

Transfer file

Securely Copy (scp)

securely copy a file into the remote device root path (default path):

scp <file> scp:<username>@<hostname/ip address>/<remote path>

securely copy a file from remote device:

scp scp:<username>@<hostname/ip address>/<remote path>/<file> <local file>

Securely File Transfer Protocol (sftp)

securely copy file between remote device

1. connect to remote device

    sftp <username>@<hostname/ip address>/<remote path>
   

2. indicates sftp >, connected with remote device

   • send file to remote device

       put <file>
     

   • receive file from remote device

       get <file>
     

Command

Run command on remote device

ssh <username>@<hostname/ip_address>/<remote_path> '<command>'

Authorization

copying the local host’s public key to the remote host’s authorized keys file and by verifying file permissions and ownership

ssh-copy-id -i <public key> <username>@<hostname/ip address>