---
stage: Verify
group: Continuous Integration
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
type: reference
---

# GitLab CI/CD script syntax

You can use special syntax in [`script`](README.md#script) sections to:

- [Split long commands](#split-long-commands) into multiline commands.
- [Use color codes](#add-color-codes-to-script-output) to make job logs easier to review.
- [Create custom collapsible sections](../jobs/index.md#custom-collapsible-sections)
  to simplify job log output.

## Split long commands

You can split long commands into multiline commands to improve readability with
`|` (literal) and `>` (folded) [YAML multiline block scalar indicators](https://yaml-multiline.info/).

WARNING:
If multiple commands are combined into one command string, only the last command's
failure or success is reported.
[Failures from earlier commands are ignored due to a bug](https://gitlab.com/gitlab-org/gitlab-runner/-/issues/25394).
To work around this, run each command as a separate `script:` item, or add an `exit 1`
command to each command string.

You can use the `|` (literal) YAML multiline block scalar indicator to write
commands over multiple lines in the `script` section of a job description.
Each line is treated as a separate command.
Only the first command is repeated in the job log, but additional
commands are still executed:

```yaml
job:
  script:
    - |
      echo "First command line."
      echo "Second command line."
      echo "Third command line."
```

The example above renders in the job log as:

```shell
$ echo First command line # collapsed multiline command
First command line
Second command line.
Third command line.
```

The `>` (folded) YAML multiline block scalar indicator treats empty lines between
sections as the start of a new command:

```yaml
job:
  script:
    - >
      echo "First command line
      is split over two lines."

      echo "Second command line."
```

This behaves similarly to multiline commands without the `>` or `|` block
scalar indicators:

```yaml
job:
  script:
    - echo "First command line
      is split over two lines."

      echo "Second command line."
```

Both examples above render in the job log as:

```shell
$ echo First command line is split over two lines. # collapsed multiline command
First command line is split over two lines.
Second command line.
```

When you omit the `>` or `|` block scalar indicators, GitLab concatenates non-empty
lines to form the command. Make sure the lines can run when concatenated.

[Shell here documents](https://en.wikipedia.org/wiki/Here_document) work with the
`|` and `>` operators as well. The example below transliterates lower case letters
to upper case:

```yaml
job:
  script:
    - |
      tr a-z A-Z << END_TEXT
        one two three
        four five six
      END_TEXT
```

Results in:

```shell
$ tr a-z A-Z << END_TEXT # collapsed multiline command
  ONE TWO THREE
  FOUR FIVE SIX
```

## Add color codes to script output

Script output can be colored using [ANSI escape codes](https://en.wikipedia.org/wiki/ANSI_escape_code#Colors),
or by running commands or programs that output ANSI escape codes.

For example, using [Bash with color codes](https://misc.flogisoft.com/bash/tip_colors_and_formatting):

```yaml
job:
  script:
    - echo -e "\e[31mThis text is red,\e[0m but this text isn't\e[31m however this text is red again."
```

You can define the color codes in Shell variables, or even [custom environment variables](../variables/README.md#custom-environment-variables),
which makes the commands easier to read and reusable.

For example, using the same example as above and variables defined in a `before_script`:

```yaml
job:
  before_script:
    - TXT_RED="\e[31m" && TXT_CLEAR="\e[0m"
  script:
    - echo -e "${TXT_RED}This text is red,${TXT_CLEAR} but this part isn't${TXT_RED} however this part is again."
    - echo "This text is not colored"
```

Or with [PowerShell color codes](https://superuser.com/a/1259916):

```yaml
job:
  before_script:
    - $esc="$([char]27)"; $TXT_RED="$esc[31m"; $TXT_CLEAR="$esc[0m"
  script:
    - Write-Host $TXT_RED"This text is red,"$TXT_CLEAR" but this text isn't"$TXT_RED" however this text is red again."
    - Write-Host "This text is not colored"
```
