documentation

docs/config/config-dynvars.md

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+# Dynvariables entry
+
+The **dynvariables** entry (optional) contains an interpreted variables mapping.
+
+```yaml
+dynvariables:
+  <variable-name>: <shell-oneliner>
+```
+
+You can also use multi-line (see [yaml related doc](https://yaml-multiline.info/)).
+For example:
+```yaml
+dynvariables:
+  <variable-name>: >-
+    <line1>
+    <line2>
+    <line3>
+```
+
+For example:
+```yaml
+dynvariables:
+  dvar1: head -1 /proc/meminfo
+  dvar2: "echo 'this is some test' | rev | tr ' ' ','"
+  dvar3: /tmp/my_shell_script.sh
+  user: "echo $USER"
+  config_file: >-
+    test -f "{{@@ base_config @@}}" &&
+    echo "{{@@ base_config @@}}" ||
+    echo "{{@@ dfl_config @@}}"
+variables:
+  base_config: "profile_base.yaml"
+  dfl_config: "profile_default.yaml"
+```
+
+They have the same properties as [Variables](config-variables.md).