awk Patterns for Log Analysis and Text Processing
awk sits between grep and a full programming language. It’s perfect for columnar data, log files, and quick text transformations. The Basic Pattern 1 awk 'pattern { action }' file If pattern matches, run action. No pattern means every line. No action means print. 1 2 3 4 5 6 7 8 9 10 11 # Print everything awk '{ print }' file.txt # Print lines matching pattern awk '/error/' file.txt # Print second column awk '{ print $2 }' file.txt # Combined: errors, show timestamp and message awk '/error/ { print $1, $4 }' app.log Field Handling awk splits lines into fields by whitespace (default): ...