diff --git a/scripts/echo b/scripts/echo
index acedf43..96bb0c4 100755
--- a/scripts/echo
+++ b/scripts/echo
@@ -2,12 +2,20 @@
 
 import sys
 
+TTY = sys.stdout.isatty()
+
 write = sys.stdout.write
 
 write('\n')
-write('\x1b[')  # escape, left-bracket
-write('1;31m')  # bold red
+
+if TTY:
+    write('\x1b[')  # escape, left-bracket
+    write('1;31m')  # bold red
+
 write(' '.join(sys.argv[1:]))
-write('\x1b[')  # escape, left-bracket
-write('0m')     # reset
+
+if TTY:
+    write('\x1b[')  # escape, left-bracket
+    write('0m')     # reset
+
 write('\n')