Linux AWK Command: A Beginner's Guide to Text Processing

Introduction to AWK

• 💡 AWK is a powerful command-line utility on Linux used for text processing.
• 🎯 It allows for quick manipulation and extraction of data from text files and command outputs.

Basic AWK Operations

• 📄 The video demonstrates processing a sample text file with two lines and three columns.
• 📌 To print the first column (names), use awk '{print $1}' filename.txt.
• 🏙️ Similarly, to print the third column (cities), use awk '{print $3}' filename.txt.

Filtering and Calculations

• 🔍 Lines can be filtered based on column values; for instance, display lines where the second column is greater than 27 using awk '$2 > 27 {print $0}' filename.txt.
• ➕ AWK can perform calculations, such as summing values in a column, by iterating through lines like a loop and accumulating results.

Custom Field Separators and Pipes

• ⚙️ The default field separator (space) can be changed using the -F option, for example, to process files with a different delimiter like a colon: awk -F':' '{print $1}' filename.txt.
• 🔗 AWK can be effectively used with pipes to process the output of other commands, extracting specific columns from real-time command results.