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Bash Conditional Structures: CASE Construct     IF - THEN construct in Bash IF - THEN In Bash, we have the following conditional statements: 1.   if..then..fi statement (Simple If) 2.   if..then..else..fi...

OPERATORS: Bash Logical Operators   Logical Operators  Operator Symbol Meaning &&  Logical AND || Logical OR ! Logical NOT     Examples echo $((2 && 0)) 0 echo $((4 && 1)) 1 echo $((3 || 0)) 1 echo...

OPERATORS: Bash Bitwise Operators   Bitwise Operators Bitwise Operators  Operator Symbol Meaning << Bitwise Left Shift >> Bitwise Right Shift & Bitwise AND | Bitwise OR ~ Bitwise Negate ^ Bitwise XOR     Examples  a=4 let b="$a<<1" echo $b 8 b=8 c=4 echo $(($c|$d))...

OPERATORS: Bash Arithmetic Operators   Arithmetic Operators Arithmetic Operators  Operator Symbol Meaning +  Addition - Subtraction * Multiplication / Division % Mod Operator ** Exponent Operator     Arithmetic evaluation using let command Arithmetic evaluation using let command The let statement can be used to do...

  SHELL SCRIPTING   What is a Script? What is a Script?  The script is a text file which will contain: Shell commands you normally use. Shell flow control...

SHELL BUILDING BLOCKS   Components of Shell Building Blocks Shell Building Blocks • Shell syntax • Shell commands • Shell functions • Shell parameters • Shell expansions • Redirections • Executing commands • Shell scripts What...

More File attributes   File Systems and Inodes File Systems Every file system in Unix/Linux has a directory structure headed by root ( / ) If you have...

Process in Linux   Process Basics A process is simply an instance of a running program. A process is said to be born when the program starts...

Vi Text Editor   Vi Text Editor Modes The vi text editor has three modes namely 1. Writing mode: 2. command mode: 3. command line mode: When vi editor is opened,...

Filters What are Filters in Linux What are filters: Basics Filters: Using both standard input and standard output Do all commands use the feature of standard input and...