Unix Shell Programming -

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.

A Unix shell is a command-line interpreter that acts as an interface between the user and the operating system. Shell programming (or scripting) involves writing a series of commands in a plain text file, which the shell executes sequentially. It enables automation of repetitive tasks, system management, and complex data processing. 2. Key Components of Shell Scripts

Run chmod +x script.sh to grant execution permissions. Run the script: Execute with ./script.sh . 6. Best Practices for Shell Programming Unix Shell Programming

The first line of a script, e.g., #!/bin/bash , which specifies the interpreter to use.

Use set -e to exit the script immediately if a command fails, enhancing reliability. if-then-else , case statements for decision-making

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

Quote variables to prevent issues with spaces, e.g., "$variable" . >> : Append output

Use a text editor like vi or nano to create a file, e.g., script.sh .