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# Prefixing

## Prefix Styles

concurrently will by default prefix each command's outputs with a zero-based index, wrapped in square brackets:

```bash
$ concurrently 'echo Hello there' "echo 'General Kenobi!'"
[0] Hello there
[1] General Kenobi!
[0] echo Hello there exited with code 0
[1] echo 'General Kenobi!' exited with code 0
```

If you've given the commands names, they are used instead:

```bash
$ concurrently --names one,two 'echo Hello there' "echo 'General Kenobi!'"
[one] Hello there
[two] General Kenobi!
[one] echo Hello there exited with code 0
[two] echo 'General Kenobi!' exited with code 0
```

There are other prefix styles available too:

| Style     | Description                       |
| --------- | --------------------------------- |
| `index`   | Zero-based command's index        |
| `name`    | The command's name                |
| `command` | The command's line                |
| `time`    | Time of output                    |
| `pid`     | ID of the command's process (PID) |
| `none`    | No prefix                         |

Any of these can be used by setting the `--prefix`/`-p` flag. For example:

```bash
$ concurrently --prefix pid 'echo Hello there' 'echo General Kenobi!'
[2222] Hello there
[2223] General Kenobi!
[2222] echo Hello there exited with code 0
[2223] echo 'General Kenobi!' exited with code 0
```

It's also possible to have a prefix based on a template. Any of the styles listed above can be used by wrapping it in `{}`.
Doing so will also remove the square brackets:

```bash
$ concurrently --prefix '{index}-{pid}' 'echo Hello there' 'echo General Kenobi!'
0-2222 Hello there
1-2223 General Kenobi!
0-2222 echo Hello there exited with code 0
1-2223 echo 'General Kenobi!' exited with code 0
```

## Prefix Colors

By default, there are no colors applied to concurrently prefixes, and they just use whatever the terminal's defaults are.

This can be changed by using the `--prefix-colors`/`-c` flag, which takes a comma-separated list of colors to use.<br/>
The available values are color names (e.g. `green`, `magenta`, `gray`, etc), a hex value (such as `#23de43`), or `auto`, to automatically select a color.

```bash
$ concurrently -c red,blue 'echo Hello there' 'echo General Kenobi!'
```

<details>
<summary>List of available color names</summary>

- `black`
- `blue`
- `cyan`
- `green`
- `gray`
- `magenta`
- `red`
- `white`
- `yellow`
</details>

Colors can take modifiers too. Several can be applied at once by prepending `.<modifier 1>.<modifier 2>` and so on.

```bash
$ concurrently -c red,bold.blue.dim 'echo Hello there' 'echo General Kenobi!'
```

<details>
<summary>List of available modifiers</summary>

- `reset`
- `bold`
- `dim`
- `hidden`
- `inverse`
- `italic`
- `strikethrough`
- `underline`
</details>

A background color can be set in a similarly fashion.

```bash
$ concurrently -c bgGray,red.bgBlack 'echo Hello there' 'echo General Kenobi!'
```

<details>
<summary>List of available background color names</summary>

- `bgBlack`
- `bgBlue`
- `bgCyan`
- `bgGreen`
- `bgGray`
- `bgMagenta`
- `bgRed`
- `bgWhite`
- `bgYellow`
</details>

## Prefix Length

When using the `command` prefix style, it's possible that it'll be too long.<br/>
It can be limited by setting the `--prefix-length`/`-l` flag:

```bash
$ concurrently -p command -l 10 'echo Hello there' 'echo General Kenobi!'
[echo..here] Hello there
[echo..bi!'] General Kenobi!
[echo..here] echo Hello there exited with code 0
[echo..bi!'] echo 'General Kenobi!' exited with code 0
```

It's also possible that some prefixes are too short, and you want all of them to have the same length.<br/>
This can be done by setting the `--pad-prefix` flag:

```bash
$ concurrently -n foo,barbaz --pad-prefix 'echo Hello there' 'echo General Kenobi!'
[foo   ] Hello there
[foo   ] echo Hello there exited with code 0
[barbaz] General Kenobi!
[barbaz] echo 'General Kenobi!' exited with code 0
```

> [!NOTE]
> If using the `pid` prefix style in combination with [`--restart-tries`](./restarting.md), the length of the PID might grow, in which case all subsequent lines will match the new length.<br/>
> This might happen, for example, if the PID was 99 and it's now 100.

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