diff --git a/acceptance_tests/pipe.sh b/acceptance_tests/pipe.sh
new file mode 100755
index 00000000..43709dea
--- /dev/null
+++ b/acceptance_tests/pipe.sh
@@ -0,0 +1,70 @@
+#!/bin/bash
+
+setUp() {
+  rm test*.yml || true
+  cat >test.yml <<EOL
+a: frog
+EOL
+}
+
+testPipeViaCatWithParam() {
+  X=$(cat test.yml | ./yq '.a')
+  assertEquals "frog" "$X"
+}
+
+testPipeViaCatWithParamEval() {
+  X=$(cat test.yml | ./yq e '.a')
+  assertEquals "frog" "$X"
+}
+
+testPipeViaCatWithParamEvalAll() {
+  X=$(cat test.yml | ./yq ea '.a')
+  assertEquals "frog" "$X"
+}
+
+testPipeViaCatNoParam() {
+  X=$(cat test.yml | ./yq)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaCatNoParamEval() {
+  X=$(cat test.yml | ./yq e)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaCatNoParamEvalAll() {
+  X=$(cat test.yml | ./yq ea)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaFileishWithParam() {
+  X=$(./yq '.a' < test.yml)
+  assertEquals "frog" "$X"
+}
+
+testPipeViaFileishWithParamEval() {
+  X=$(./yq e '.a' < test.yml)
+  assertEquals "frog" "$X"
+}
+
+testPipeViaFileishWithParamEvalAll() {
+  X=$(./yq ea '.a' < test.yml)
+  assertEquals "frog" "$X"
+}
+
+testPipeViaFileishNoParam() {
+  X=$(./yq < test.yml)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaFileishNoParamEval() {
+  X=$(./yq e < test.yml)
+  assertEquals "a: frog" "$X"
+}
+
+testPipeViaFileishNoParamEvalAll() {
+  X=$(./yq ea < test.yml)
+  assertEquals "a: frog" "$X"
+}
+
+source ./scripts/shunit2
\ No newline at end of file
diff --git a/cmd/evaluate_all_command.go b/cmd/evaluate_all_command.go
index c35364f4..1dd6bc20 100644
--- a/cmd/evaluate_all_command.go
+++ b/cmd/evaluate_all_command.go
@@ -54,6 +54,7 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 
 	stat, _ := os.Stdin.Stat()
 	pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
+	yqlib.GetLogger().Debug("pipingStdIn: %v", pipingStdIn)
 
 	out := cmd.OutOrStdout()
 
diff --git a/cmd/evalute_sequence_command.go b/cmd/evalute_sequence_command.go
index c4cbc002..6cfe5b51 100644
--- a/cmd/evalute_sequence_command.go
+++ b/cmd/evalute_sequence_command.go
@@ -67,6 +67,26 @@ func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
 
 	stat, _ := os.Stdin.Stat()
 	pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
+	yqlib.GetLogger().Debug("stat.Mode(): %v", stat.Mode())
+	yqlib.GetLogger().Debug("pipingStdIn: %v", pipingStdIn)
+	yqlib.GetLogger().Debug("ModeDir: %v", stat.Mode()&os.ModeDir)
+	yqlib.GetLogger().Debug("ModeAppend: %v", stat.Mode()&os.ModeAppend)
+	yqlib.GetLogger().Debug("ModeExclusive: %v", stat.Mode()&os.ModeExclusive)
+	yqlib.GetLogger().Debug("ModeTemporary: %v", stat.Mode()&os.ModeTemporary)
+	yqlib.GetLogger().Debug("ModeSymlink: %v", stat.Mode()&os.ModeSymlink)
+	yqlib.GetLogger().Debug("ModeDevice: %v", stat.Mode()&os.ModeDevice)
+	yqlib.GetLogger().Debug("ModeNamedPipe: %v", stat.Mode()&os.ModeNamedPipe)
+	yqlib.GetLogger().Debug("ModeSocket: %v", stat.Mode()&os.ModeSocket)
+	yqlib.GetLogger().Debug("ModeSetuid: %v", stat.Mode()&os.ModeSetuid)
+	yqlib.GetLogger().Debug("ModeSetgid: %v", stat.Mode()&os.ModeSetgid)
+	yqlib.GetLogger().Debug("ModeCharDevice: %v", stat.Mode()&os.ModeCharDevice)
+	yqlib.GetLogger().Debug("ModeSticky: %v", stat.Mode()&os.ModeSticky)
+	yqlib.GetLogger().Debug("ModeIrregular: %v", stat.Mode()&os.ModeIrregular)
+
+	// Mask for the type bits. For regular files, none will be set.
+	yqlib.GetLogger().Debug("ModeType: %v", stat.Mode()&os.ModeType)
+
+	yqlib.GetLogger().Debug("ModePerm: %v", stat.Mode()&os.ModePerm)
 
 	out := cmd.OutOrStdout()