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2016-Feb-02-Wednesday

From 9:30 AM TO 12:30 PM :

  • I started taking online course on File Permissions. And completed 2 video lectures and done the assignment as well. Through which I came to learn following commands

File Permissions:

  • Permissions are access to rights to users and groups of users.Every file or directory in linux has 3 permssions defined as owners, those are
    • Owner - a single person who owns the file.
    • Group - every file belongs to a single group.
    • Others - everyone else who is not in the group or the owner.
  • Read = 4
  • Write = 2
  • Execute = 1
Syntax:- chmod <options> <mode> <files>
chmod 777 file

chmod -R 777 folder

From 2:00 PM TO 6:00 PM :

SSH (Secure Shell):

  • SSH is a Network protocol which is used for secure communication.
  • The Secure Shell (SSH) Protocol by default uses port 22.
Syntax:- ssh <username>@<hostname>

SCP (Secure Copy):

  • SCP is a secure copy from between hosts on a network.
Syntax:- scp [options] <username>@<hostname>:<sourcepath> <destination> (copy from remote machine to local machine)
Syntax:- scp [options] <source:path> <username>@<hostname>:<destination> (copy from local machine to remote machine)

rsync (Remote Synchronized):

  • rsync is a remote synchronized command, which is used for copying files and directories remotely as well as locally in Linux/Unix systems.
Syntax:- rsync [options] user@host:sourcepath destination:path (copy from remote machine to local machine)
Syntax:- rsync [options] source:path user@host:destination:path (copy from local machine to remote machine)

Difference between SCP and RSYNC:

  • It’s faster than scp (Secure Copy) because rsync uses remote-update protocol which allows to transfer.
  • Difference between two files in a directory, it copies the two files from source to destination, but next time, it copies only the changed files to the desination