After getting comfortable with Bash scripting, I was on the lookout for something that could handle data processing more efficiently. That’s when my mentor M Prashant introduced me to AWK. At first, I wasn’t sure I needed it—Bash was doing the job—but once I started using AWK, I realized how powerful it actually is.

Here’s my journey of learning AWK, and why I think it’s worth your time if you work with data or text files regularly.
What is AWK?

AWK is a command-line tool that processes text files. It reads a file line by line, looks for patterns, and performs actions on lines that match. It sounds technical, but once I tried a few basic commands, it clicked. AWK is great when you need to filter, extract, or even transform data quickly.
My First Steps with AWK

Printing Everything:

awk '{ print }' file.txt

My first command in AWK! It just prints every line from the file. Simple, but a good starting point.

Printing Specific Columns:

awk '{ print $1, $3 }' file.txt

AWK splits lines into fields, so $1 is the first column, $3 is the third, and so on. This command let me print just the parts I needed, which was super handy for working with CSV files.

Finding Specific Patterns:

awk '/error/ { print }' log.txt

This was a lifesaver when I had to go through logs. It printed only the lines containing the word “error,” saving me a ton of time.

Why AWK is a Game-Changer

The real magic of AWK, for me, came when I realized how fast it handles data. For example, summing up numbers from a column is a task that would take a while in Bash, but AWK does it in one line:

awk '{ sum += $2 } END { print sum }' data.txt

In this case, it adds up all the numbers in the second column and prints the total. That’s when I thought, “Wow, this tool is powerful!”
Handy AWK Tips I Use

Changing Field Separators: Normally, AWK treats spaces as the separator between fields, but for CSV files, you can switch it to a **comma:**

awk 'BEGIN { FS="," } { print $1, $3 }' file.csv

Counting Lines:

awk 'END { print NR }' file.txt

This command prints the total number of lines in a file. It’s great when I need to check the size of a dataset.

Replacing Text:

awk '{ gsub(/old/, "new"); print }' file.txt

AWK can quickly replace all occurrences of a word. I’ve used this to make quick edits to files without opening them.

Final Thoughts

Learning AWK was a turning point for me. I went from thinking I didn’t need another tool to realizing how much time it saves when working with large files or complex data. Thanks to Prashant for pushing me to learn it! Now, I can’t imagine handling logs or CSVs without AWK.

If you work with text data regularly, give AWK a try. It’s a bit of a learning curve, but once you understand the basics, it’ll become your go-to tool for fast and efficient data processing.