ncom

ncom is a tool that will output different combinations (pairs) of the existing lines of the given file or stdin.

For example, with the following command:

$ cat words.txt | ncom

where words.txt contains the following:

dog
cat
1234

the program will produce this:

dog
cat
1234
dogdog
dogcat
dog1234
catdog
catcat
cat1234
1234dog
1234cat
12341234

You can have it exclude numerical bases with -n, so with this command

$ cat words.txt | ncom -n

It will output this

dog
cat
1234
dogdog
dogcat
dog1234
catdog
catcat
cat1234

and you can exclude cases where the base and the to-be-appended part the same with -b. So with this command

$ cat words.txt | ncom -b

It will, instead, output this

dog
cat
1234
dogcat
dog1234
catdog
cat1234
1234dog
1234cat

(no dogdog, catcat etc.)

Additionally, you can set some delimiters with the -d option. For example:

$ echo "fish\ntuna" | ncom -d .% fish tuna fishfish fishtuna tunafish tunatuna fish.fish fish.tuna tuna.fish tuna.tuna fish%fish fish%tuna tuna%fish tuna%tuna

Language: C
Current version: 1.2
Author: Michael Constantine Dimopoulos
Source code: https://mcdim.xyz/git/narthex/file/com/ncom.c.html
Manpage: https://mcdim.xyz/git/narthex/file/com/ncom.1.html

νάρθηξ - narthex

ncom