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Added notice for older versions of yq

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Mike Farah 2022-01-28 13:06:58 +11:00
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@ -4,6 +4,27 @@ a lightweight and portable command-line YAML processor. `yq` uses [jq](https://g
yq is written in go - so you can download a dependency free binary for your platform and you are good to go! If you prefer there are a variety of package managers that can be used as well as docker, all listed below.
## Notice for v4.x versions prior to 4.18.1
Since 4.18.1, yq's 'eval/e' command is the _default_ command and no longers needs to be specified.
Older versions will still need to specify 'eval/e'.
Similarly, '-' is no longer required as a filename to read from STDIN (unless reading from multiple files).
TLDR:
Prior to 4.18.1
```bash
cat file.yaml | yq e '.cool' -
```
4.18+
```bash
cat file.yaml | yq '.cool'
```
When merging multiple files together, `eval-all/ea` is still required to tell `yq` to run the expression again all the document at once.
## Quick Usage Guide
Read a value: