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Linux advanced commands

1. SSH key generation and remote login

1. Execute the below command and simply keep on pressing enter until it is done

   ssh-keygen
   

2. Copy your public key to the remote server using the following command

   ssh-copy-id userName@serverIP
   

3. Test the remote login

   ssh userName@serverIP
   

2. Setting up the config file

1. Go into .ssh folder

   cd .ssh
   

2. Create a file named ‘config’

   vim config
   

3. Edit the file by entering the following details

   Host petName
       User studentID
       Port 22
       Hostname ipaddress
   
   #Example   
   Host skytree
      User s123000
      Port 22
      Hostname skytree1.u-aizu.ac.jp
   

4. Save the file and exit.

   :wq
   

5. Change the file permission to 600

   chmod 600 config
   

6. Try to remote login into the server from the terminal

   ssh petName
   E.g., ssh skytree
   

3. SCP: copying files between remote servers and local machines

Command to copy local files to remote server

scp fileName userName@remoteServerIP:location

E.g., scp test.txt user@server.uAizu:~
#The above command copies text.txt into the home folder of the user

scp -r folderName userName0remoteServerIP:location
E.g., E.g., scp copyFolder user@server.uAizu:~

Command to copy remote files to local machine

scp user@server.uAizu:fileName localPath
E.g., scp user@server.uAizu:~/test.txt  ~

scp -r user@server.uAizu:folderName localPath
E.g., scp user@server.uAizu:fileName localPath

3. Monitoring the process

Monitor the processes running on the server machine using the below command:

top

Press Control + C to quit. Use ‘kill’ command to stop any unwanted process.