Split into multiple files

yq can split out the results into multiple files with the --split-exp/s flag. You will need to give this flag an expression (that returns a string), this will be used as the filename for each result. In this expression, you can use $index to represent the result index in the name, if desired.
Split documents into files
Given a file like
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a: test_doc1
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--- 
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a: test_doc2
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Then running:
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yq e -s '.a' myfile.yml
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will result in two files:
test_doc1.yml:
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a: test_doc1
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test_doc2.yml:
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---
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a: test_doc2
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TIP: if you don't want the leading document separators (---), then run with the --no-doc flag.
Split documents into files, using index
This is like the example above, but we'll use $index for the filename. Note that this variable is only defined for the --split-exp/s flag.
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yq e -s '"file_" + $index' myfile.yml
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This will create two files, file_0.yml and file_1.yml.
Split single document into files
You can also split results into separate files. Notice
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- name: bob
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  age: 23
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- name: tim
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  age: 17
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Then, by splatting the array into individual results, we can split the content into several files:
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yq e '.[]' file.yml -s '"user_" + .name'
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will result in two files:
user_bob.yml:
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name: bob
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age: 23
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user_tim.yml:
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name: tim
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age: 17
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Split documents into files

Split documents into files, using index

Split single document into files