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yq
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yq
v4.x
yq
How It Works
Upgrading from V3
Commands
Evaluate
Evaluate All
Shell Completion
Operators
Add
Alternative (Default value)
Anchor and Alias Operators
Assign (Update)
Boolean Operators
Collect into Array
Comment Operators
Contains
Create, Collect into Object
Delete
Document Index
Encode / Decode
Entries
Env Variable Operators
Equals
File Operators
Flatten
Group By
Has
Keys
Length
Load
Map
Multiply (Merge)
Parent
Path
Pipe
Recursive Descent (Glob)
Reduce
Select
Sort
Sort Keys
Split into Documents
String Operators
Style
Subtract
Tag
Traverse (Read)
Union
Unique
Variable Operators
With
Usage
Output format
Working with Properties
Working with CSV, TSV
Working with JSON
Working with XML
Front Matter
Split into multiple files
GitHub Action
Tips, Tricks, Troubleshooting
Github Page
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Length
Returns the lengths of the nodes. Length is defined according to the type of the node.

String length

returns length of string
Given a sample.yml file of:
1
a: cat
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then
1
yq eval '.a | length' sample.yml
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will output
1
3
Copied!

null length

Given a sample.yml file of:
1
a: null
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then
1
yq eval '.a | length' sample.yml
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will output
1
0
Copied!

Map length

returns number of entries
Given a sample.yml file of:
1
a: cat
2
c: dog
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then
1
yq eval 'length' sample.yml
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will output
1
2
Copied!

Array length

returns number of elements
Given a sample.yml file of:
1
- 2
2
- 4
3
- 6
4
- 8
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then
1
yq eval 'length' sample.yml
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will output
1
4
Copied!
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Last modified 2mo ago
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Contents
String length
null length
Map length
Array length