awk

• Getting started with awk
• Arrays
• Built-in functions
• Built-in Variables
• Fields
• Patterns
• Patterns and Actions
• Row Manipulation
• String manipulation functions
• Two-file processing
• Useful one-liners - calculating average from a CSV etc
• Compute the average of values in a column from tabular data
• Compute the median of values in a column from tabular data
• Exchanging two columns in tabular data
• Robust processing tabular data (CSV et al.)
• Selecting a set of lines between two patterns
• Selecting specific columns in tabular data
• Variables