Join - Relational Data Operator

Merge lines from two sorted files by matching a common join field. Similar to database JOIN operations but works on plain text files with field separators.

Usage

join-tool [options] file1 file2

Options

• -1 N: Join on field N of file 1
• -2 N: Join on field N of file 2
• -t char: Use char as field separator
• -a 1: Show unpaired lines from file 1

Examples

join-tool users.txt roles.txt
join-tool -t ',' -1 2 -2 1 customers.csv orders.csv