vault backup: 2025-04-26 13:14:25

1 files changed, 18 insertions, 0 deletions

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
\ No newline at end of file