The union command for Unix text processing

Print the lines that are in any of the inputs.

Syntax:

union <input> ...

Example:

$ union 1.txt 2.txt
=> lines that are in either of the files.

Notes

The order doesn't matter.

In set theory, this command is (A union B).

This command is currently implemented using awk and POSIX.

Related

Related commands for Unix text processing sets:

• union: print lines in (A union B)
• intersect: print lines in (A intersect B)
• except: print lines in (A except B) a.k.a. (A - B)
• extra : print lines in (A extra B) a.k.a. (B - A)

Examples:

$ cat 1.txt
alpha
bravo

$ cat 2.txt
alpha
charlie

$ union 1.txt 2.txt
alpha
bravo
charlie

$ intersect 1.txt 2.txt
alpha

$ except 1.txt 2.txt
bravo

$ extra 1.txt 2.txt
charlie

Tracking

• Program: union
• Version: 2.0.2
• Created: 2017-01-30
• Updated: 2017-01-30
• License: GPL
• Contact: Joel Parker Henderson (joel@joelparkerhenderson.com)