diff --git a/internal/cmd/preprocessor/cmd/page.go b/internal/cmd/preprocessor/cmd/page.go
index a479c9c47..666e67f55 100644
--- a/internal/cmd/preprocessor/cmd/page.go
+++ b/internal/cmd/preprocessor/cmd/page.go
@@ -177,14 +177,23 @@ func (p *page) parseSanitiser(m json.RawMessage) (sanitiserMatcher, error) {
 
 	switch kind {
 	case "patternSanitiser":
-		var c patternSanitiserMatcher
-		if err := json.Unmarshal(m, &c); err != nil {
+		var ps patternSanitiserMatcher
+		if err := json.Unmarshal(m, &ps); err != nil {
 			return nil, fmt.Errorf("failed to unmarshal %s: %v", kind, err)
 		}
-		if err := c.init(); err != nil {
+		if err := ps.init(); err != nil {
 			return nil, fmt.Errorf("failed to init %s: %v", kind, err)
 		}
-		return &c, nil
+		return &ps, nil
+	case "ellipsisSanitiser":
+		var es ellipsisSanitiserMatcher
+		if err := json.Unmarshal(m, &es); err != nil {
+			return nil, fmt.Errorf("failed to unmarshal %s: %v", kind, err)
+		}
+		if err := es.init(); err != nil {
+			return nil, fmt.Errorf("failed to init %s: %v", kind, err)
+		}
+		return &es, nil
 	default:
 		return nil, fmt.Errorf("unknown sanitiser: %q", kind)
 	}
diff --git a/internal/cmd/preprocessor/cmd/sanitisers.go b/internal/cmd/preprocessor/cmd/sanitisers.go
index 7138dda65..ca1e3a4b8 100644
--- a/internal/cmd/preprocessor/cmd/sanitisers.go
+++ b/internal/cmd/preprocessor/cmd/sanitisers.go
@@ -77,6 +77,7 @@ func (m *matchSpec) init() error {
 	if m.CommandPrefix != "" {
 		cmd = m.CommandPrefix
 	}
+	// k.Step is only != "" when we are matching based on step
 	file, err := syntax.NewParser(syntax.KeepComments(true)).Parse(strings.NewReader(cmd), " ")
 	if err != nil {
 		return fmt.Errorf("failed to parse %q: %v", cmd, err)
@@ -187,3 +188,26 @@ func (p *patternSanitiserMatcher) init() error {
 	}
 	return nil
 }
+
+// An ellipsisSanitiser allows very long output to be removed and replaced with
+// the canonical '...' which is intended to indicate "and there is is more not
+// shown here".
+type ellipsisSanitiser struct {
+	Start int `json:"start"`
+}
+
+func (e *ellipsisSanitiser) sanitise(cmd *commandStmt) error {
+	if strings.Count(cmd.Output, "\n") <= e.Start {
+		return nil
+	}
+	lines := strings.Split(cmd.Output, "\n")
+	lines = append(lines[:e.Start], "...")
+	cmd.Output = strings.Join(lines, "\n") + "\n" // re-add trailing newline
+	return nil
+}
+
+type ellipsisSanitiserMatcher struct {
+	kind
+	ellipsisSanitiser
+	matchSpec
+}
diff --git a/internal/cmd/preprocessor/cmd/schema.cue b/internal/cmd/preprocessor/cmd/schema.cue
index 0eb7d40b4..1b8952767 100644
--- a/internal/cmd/preprocessor/cmd/schema.cue
+++ b/internal/cmd/preprocessor/cmd/schema.cue
@@ -20,7 +20,10 @@ package preprocessor
 		}
 	}
 
-	#sanitiser: _kind & #patternSanitiser // build up a disjunction of all sanitisers
+	#sanitiser: _kind & {
+		#patternSanitiser |
+		#ellipsisSanitiser
+	}
 	#matchingSanitiser: {
 		_matcher
 		#sanitiser
@@ -50,6 +53,15 @@ package preprocessor
 		#patternSanitiser
 	}
 
+	// Instances of #ellipsisSanitiser summarise long output with '...'
+	#ellipsisSanitiser: {
+		_kind
+		kind: "ellipsisSanitiser"
+
+		// start defines the line from which to consider an ellipsis
+		start?: int
+	}
+
 	#comparator: _kind & (#patternComparator | #unstableLineOrderComparator)
 	#matchingComparator: {
 		_matcher
diff --git a/internal/cmd/preprocessor/cmd/testdata/execute_ellipsis_sanitiser.txtar b/internal/cmd/preprocessor/cmd/testdata/execute_ellipsis_sanitiser.txtar
new file mode 100644
index 000000000..0d60c42b2
--- /dev/null
+++ b/internal/cmd/preprocessor/cmd/testdata/execute_ellipsis_sanitiser.txtar
@@ -0,0 +1,61 @@
+# Ensure that the ellipsis sanitiser works.
+
+unquote content/dir/en.md
+
+# Run the preprocessor
+exec preprocessor execute
+
+# Verify that the target files matche the source contents
+cmp hugo/content/en/dir/index.md golden/hugo/content/en/dir/index.md
+
+-- hugo/.keep --
+-- content/dir/site.cue --
+package site
+
+content: dir: page: {
+	leftDelim:  "{{{"
+	rightDelim: "}}}"
+
+	sanitisers: [
+		{
+			kind: "ellipsisSanitiser"
+			command: "seq 1 5"
+		},
+		{
+			kind:  "ellipsisSanitiser"
+			start: 5
+			command: "seq 1 10"
+		},
+	]
+}
+-- content/dir/en.md --
+>---
+>title: JSON Superset
+>---
+>
+>{{{with script "en" "zero"}}}
+>seq 1 5
+>{{{end}}}
+>
+>{{{with script "en" "five"}}}
+>seq 1 10
+>{{{end}}}
+-- golden/hugo/content/en/dir/index.md --
+---
+title: JSON Superset
+---
+
+```text { title="TERMINAL" codeToCopy="c2VxIDEgNQo=" }
+$ seq 1 5
+...
+```
+
+```text { title="TERMINAL" codeToCopy="c2VxIDEgMTAK" }
+$ seq 1 10
+1
+2
+3
+4
+5
+...
+```