Linux workshop day-4 conducted under the Guidance of Pranav Jambare covered up the following points

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Sticky bit

• Setting Sticky bit on the directory allow only file owner, directory owner and root user to rename or delete its files.

• It is only applicable to directories and not to files

    #Assigning the Stickybit the directory should have 777 permission
    chmod 777 <dirName>
  
    #Applying the sticky bit
    [root@ip-172-31-32-5 ec2-user]# chmod +t <dirName>
  

  SUID

• When the SUID bit on an executable file is set, it signifies that the file will be executed with the same permissions as the executable's owner.

  SGID

• The process will have the same group rights as the file being executed, just like SUID.

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SSH

• The Secure Shell Protocol (SSH) is a cryptographic network protocol that allows network services to be operated safely over an unsecured network.

• SSH apps use a client-server architecture to connect an SSH client to an SSH server.

• It uses port no 22

    #installing required packages
    yum install openssh-server
    yum install openssh-client
  

• Check whether the port is active for ssh connection

    netstat -tunlp|grep 22
  

• Check the status of the service

    systemctl status sshd
  

• Restart the service

    systemctl restart ssh
  

• Establishing connection between the Client and the server'

    ssh <username>@<userIP>
  

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Find and Locate

Find:

• Find command is used to find files and folder and to perform operations on them.

• The find command allows you to find files, folder, owner,permissions, etc.

    Syntax:
    find <path> -<Searchoption> <filename>
  

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Locate:

• Locate command is used to find files by names.

• It searches databases rather than file system.

• Locate command is faster than find.

• The database needs to be updated using the "updatedb" command.

Syntax:
#Update database
updatedb

#locate file
locate <fileName>