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| author | Jasper Ras <jras@hostnet.nl> | 2025-04-25 16:15:25 +0200 |
|---|---|---|
| committer | Jasper Ras <jras@hostnet.nl> | 2025-04-25 16:15:25 +0200 |
| commit | c9a730e5b363a10639309c81dab838232ee434b6 (patch) | |
| tree | 56463ab88aae11ede76b21a9ac20376606d72f8f /Using JQ to construct an array and filtering empty strings.md | |
| parent | ab409a3701bf59dd73dc1e0324376bdac8b6d74f (diff) | |
vault backup: 2025-04-25 16:15:25
Diffstat (limited to 'Using JQ to construct an array and filtering empty strings.md')
| -rw-r--r-- | Using JQ to construct an array and filtering empty strings.md | 18 |
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diff --git a/Using JQ to construct an array and filtering empty strings.md b/Using JQ to construct an array and filtering empty strings.md new file mode 100644 index 0000000..d04c593 --- /dev/null +++ b/Using JQ to construct an array and filtering empty strings.md @@ -0,0 +1,18 @@ +--- +tags: + - jq + - howto +--- +Today I learned how to use JQ to construct an array from stdin, while also filtering empty strings. + +In below examples the -R switch makes jq process input as raw non-json data, and the -n switch stops it from discarding the first line. + +``` +sudo virsh checkpoint-list --name instance-0002c4d7 | jq -Rn '[inputs | if length > 0 then . else empty end]' +``` +^ Demonstrates use of empty + +``` +sudo virsh checkpoint-list --name instance-0002c4d7 | jq -Rn '[inputs | select(length > 0)]' +``` +^ easier using select
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