Runlevels are an important part of Linux operating system.If the administrator Understands runlevels concept clearly,It will be another layer of control and flexibility over the servers for them. Whenever the [ … ]

Command Description # root user prompt $ user working prompt $logname Displays current user name $pwd Present working directory $date Display current date & time $cal Display current month calendar [ … ]

Editors: Editors are used for adding, modifying and / or deleting  text.The types of different editors used are: Windows: notepad DOS: edit Linux/Unix CLI based  : ex , ed , [ … ]

In any operating system, it is possible to create jobs that you want to reoccur. this process known as job scheduling, is usually done based on user-defined jobs. As an [ … ]

Regular Expressions or Regex (Grep): Globally research a regular expression and print.To search a string or regular expression in a file(s)Syntax: grep  [options]  PATTERN FILE(S) grep        [options]  [ … ]

cut: It divides a string or output.syntax: cut [option] Filename option:-d   specifies a delimiter-f   Displays a particular-c   Displays a character Displays the third field of the text using space as [ … ]

Tar : Tar can be used to archive a group of files or folder Options Description c create a archive t display files on archive (to view only) x  extract [ … ]

 TO APPLY THE ACL PERMISSIONcat > solarisls  ( to check the file )setfacl  -m u:a1:rw  solarisTO CHECK THE ACL PERMISSION FOR FILE ll solaris TO CHECK ACL USERS WITH PERMISSION [ … ]

File and Directory Attributes: Unix/Linux files have 8 attributes that can be seen with ls –ld [root@comp1 ~]#  ls  -ld  reports Access Levels: Access Mode: Access Modes: Absolute Mode Symbolic [ … ]

Group:Group is a collection of user to whom the same permissions are to be applied. There are two types of groups  Primary  Secondary. Red Hat Linux uses a User Private [ … ]