awk

• Getting started with awk
• Arrays
• Built-in functions
• Built-in Variables
• ARGV, ARGC - Array of Command Line Arguments
• FNR - Number of Records in File
• FNR - The Current Record Number being processed
• FS - Field Separator
• FS - Field Separator
• NF - Number of Fields
• NF - Number of Fields
• NR - Total Number of Records
• OFS - Output Field Separator
• OFS - Output Field Separator
• ORS - Output Record Separator
• ORS - Output Record Separator
• RS - Input Record Separator
• RS - Record Separator
• Fields
• Patterns
• Patterns and Actions
• Row Manipulation
• String manipulation functions
• Two-file processing
• Useful one-liners - calculating average from a CSV etc
• Variables