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---
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.
[These 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 environment variables, or even [custom CI/CD variables](../variables/README.md#custom-cicd-variables),
which makes the commands easier to read and reusable.
For example, using the same example as above and environment 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"
```
## Troubleshooting
### `Syntax is incorrect` in scripts that use `:`
If you use a colon (`:`) in a script, GitLab might output:
- `Syntax is incorrect`
- `script config should be a string or a nested array of strings up to 10 levels deep`
For example, if you use `"PRIVATE-TOKEN: ${PRIVATE_TOKEN}"` as part of a cURL command:
```yaml
pages-job:
stage: deploy
script:
- curl --header 'PRIVATE-TOKEN: ${PRIVATE_TOKEN}' "https://gitlab.example.com/api/v4/projects"
```
The YAML parser thinks the `:` defines a YAML keyword, and outputs the
`Syntax is incorrect` error.
To use commands that contain a colon, you should wrap the whole command
in single quotes. You might need to change existing single quotes (`'`) into double quotes (`"`):
```yaml
pages-job:
stage: deploy
script:
- 'curl --header "PRIVATE-TOKEN: ${PRIVATE_TOKEN}" "https://gitlab.example.com/api/v4/projects"'
```
|
