Unix Shell Programming Apr 2026

if-then-else , case statements for decision-making. Loops: for , while loops to repeat tasks. Input/Output Redirection & Pipes: > : Redirect output (overwrite file). >> : Append output.

Used to store data. In shell, all variables are treated as strings. Example: name="John" ; echo $name (access variable with $ ). Control Structures: Unix Shell Programming

Always use a ( #!/bin/bash ) to ensure the correct shell is used. Add comments ( # ) to explain complex logic. if-then-else , case statements for decision-making

The first line of a script, e.g., #!/bin/bash , which specifies the interpreter to use. case statements for decision-making. Loops: for

Quote variables to prevent issues with spaces, e.g., "$variable" .

grep (search), sed (stream editor), awk (data manipulation), cat (view content), cut , sort .