https://github.com/tomnomnom/comb

Combine the lines from two files in every combination
https://github.com/tomnomnom/comb

Last synced: about 2 months ago
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Combine the lines from two files in every combination

README

# comb

Combine the lines from two files in every combination. Apparently that's
called the cartesian product but don't quote me on that.

## Install

```
▶ go get -u github.com/tomnomnom/comb
```

Or [download a binary](https://github.com/tomnomnom/comb/releases) and put
it somewhere in your `$PATH` (e.g. `/usr/bin/comb`).

## Usage

```
▶ comb -h
Combine the lines from two files in every combination

Usage:
comb [OPTIONS]

Options:
-f, --flip Flip mode (order by suffix)
-s, --separator String to place between prefix and suffix
```

## Example

Normal mode:

```
▶ cat prefixes
1
2

▶ cat suffixes
A
B
C

▶ comb prefixes suffixes
1A
1B
1C
2A
2B
2C
```

Flip mode (order by suffix):

```
▶ comb --flip prefixes suffixes
1A
2A
1B
2B
1C
2C
```

Separator:

```
▶ comb --separator="-" prefixes suffixes
1-A
1-B
1-C
2-A
2-B
2-C
```

## Can't you just do this with a couple of nested bash loops?

Yes, but it's a PITA to type this:

```
▶ while read prefix; do while read suffix; do echo $prefix$suffix; done < suffixes; done < prefixes
1A
1B
1C
2A
2B
2C
```