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prefixing.md
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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.