diff --git a/NEWS b/NEWS
index 06a228272..d60777c02 100644
--- a/NEWS
+++ b/NEWS
@@ -24,6 +24,11 @@ New in spot 1.99a (not yet released)
       The implementation is actually much more efficient
       than the previous implementation that was only for LTL.
 
+    - ltlfilt's old -q/--quiet option has been renamed to
+      --ignore-errors.  The new -q/--quiet semantic is the
+      same as in grep (and also autfilt): disable all normal
+      input, for situtations where only the exit status matters.
+
     - There is a parser for the HOA format
       (http://adl.github.io/hoaf/) available as a
       spot::hoa_stream_parser object or spot::hoa_parse() function.
diff --git a/bench/dtgbasat/prepare.sh b/bench/dtgbasat/prepare.sh
index 37819ce95..94d3a206d 100755
--- a/bench/dtgbasat/prepare.sh
+++ b/bench/dtgbasat/prepare.sh
@@ -5,7 +5,7 @@ ltl2tgba=../../src/bin/ltl2tgba
 dstar2tgba=../../src/bin/dstar2tgba
 
 # Rename all formulas using a b c... suppress duplicates.
-$ltlfilt -q --relabel=abc -u formulas > nodups.ltl
+$ltlfilt --ignore-errors --relabel=abc -u formulas > nodups.ltl
 
 while read f; do
   acc=`$ltl2tgba "$f" --low -a --stats="%a"`
diff --git a/src/bin/common_output.cc b/src/bin/common_output.cc
index b07efa972..1cf5f926a 100644
--- a/src/bin/common_output.cc
+++ b/src/bin/common_output.cc
@@ -104,6 +104,8 @@ stream_formula(std::ostream& out,
     case latex_output:
       spot::ltl::to_latex_string(f, out, full_parenth);
       break;
+    case quiet_output:
+      break;
     }
 }
 
@@ -259,6 +261,8 @@ output_formula_checked(const spot::ltl::formula* f,
 		       const char* filename, int linenum,
 		       const char* prefix, const char* suffix)
 {
+  if (output_format == quiet_output)
+    return;
   output_formula(std::cout, f, filename, linenum, prefix, suffix);
   std::cout << std::endl;
   // Make sure we abort if we can't write to std::cout anymore
diff --git a/src/bin/common_output.hh b/src/bin/common_output.hh
index ac2cd70fb..781d04b36 100644
--- a/src/bin/common_output.hh
+++ b/src/bin/common_output.hh
@@ -28,7 +28,8 @@
 #include "common_output.hh"
 
 enum output_format_t { spot_output, spin_output, utf8_output,
-		       lbt_output, wring_output, latex_output };
+		       lbt_output, wring_output, latex_output,
+                       quiet_output };
 extern output_format_t output_format;
 extern bool full_parenth;
 extern bool escape_csv;
diff --git a/src/bin/ltlfilt.cc b/src/bin/ltlfilt.cc
index 0eaf15281..54f6bdf47 100644
--- a/src/bin/ltlfilt.cc
+++ b/src/bin/ltlfilt.cc
@@ -84,6 +84,7 @@ Exit status:\n\
 #define OPT_REMOVE_X 28
 #define OPT_STUTTER_INSENSITIVE 29
 #define OPT_AP_N 30
+#define OPT_IGNORE_ERRORS 31
 
 static const argp_option options[] =
   {
@@ -93,7 +94,8 @@ static const argp_option options[] =
       "output erroneous lines as-is without processing", 0 },
     { "drop-errors", OPT_DROP_ERRORS, 0, 0,
       "discard erroneous lines (default)", 0 },
-    { "quiet", 'q', 0, 0, "do not report syntax errors", 0 },
+    { "ignore-errors", OPT_IGNORE_ERRORS, 0, 0,
+      "do not report syntax errors", 0 },
     /**************************************************/
     { 0, 0, 0, 0, "Transformation options:", 3 },
     { "negate", 'n', 0, 0, "negate each formula", 0 },
@@ -162,6 +164,7 @@ static const argp_option options[] =
       "drop formulas that have already been output (not affected by -v)", 0 },
     /**************************************************/
     { 0, 0, 0, 0, "Output options:", -20 },
+    { "quiet", 'q', 0, 0, "suppress all normal output", 0 },
     { 0, 0, 0, 0, "The FORMAT string passed to --format may use "\
       "the following interpreted sequences:", -19 },
     { "%f", 0, 0, OPTION_DOC | OPTION_NO_USAGE,
@@ -194,7 +197,7 @@ static bool one_match = false;
 
 enum error_style_t { drop_errors, skip_errors };
 static error_style_t error_style = drop_errors;
-static bool quiet = false;
+static bool ignore_errors = false;
 static bool nnf = false;
 static bool negate = false;
 static bool boolean_to_isop = false;
@@ -264,7 +267,7 @@ parse_opt(int key, char* arg, struct argp_state*)
       negate = true;
       break;
     case 'q':
-      quiet = true;
+      output_format = quiet_output;
       break;
     case OPT_R:
       parse_r(arg);
@@ -307,6 +310,9 @@ parse_opt(int key, char* arg, struct argp_state*)
     case OPT_GUARANTEE:
       guarantee = obligation = true;
       break;
+    case OPT_IGNORE_ERRORS:
+      ignore_errors = true;
+      break;
     case OPT_IMPLIED_BY:
       {
 	const spot::ltl::formula* i = parse_formula_arg(arg);
@@ -436,7 +442,7 @@ namespace
 
       if (!f || pel.size() > 0)
 	  {
-	    if (!quiet)
+	    if (!ignore_errors)
 	      {
 		if (filename)
 		  error_at_line(0, 0, filename, linenum, "parse error:");
@@ -451,7 +457,7 @@ namespace
 	    else
 	      assert(error_style == drop_errors);
 	    check_cout();
-	    return !quiet;
+	    return !ignore_errors;
 	  }
       try
 	{
diff --git a/src/ltltest/remove_x.test b/src/ltltest/remove_x.test
index e81dca283..c4fb448a6 100755
--- a/src/ltltest/remove_x.test
+++ b/src/ltltest/remove_x.test
@@ -19,21 +19,21 @@
 
 . ./defs
 
-run 0 ../../bin/ltlfilt --remove-x -f 'Xa' --equivalent-to 'Ga | (!a & Fa)'
+run 0 ../../bin/ltlfilt -q --remove-x -f 'Xa' --equivalent-to 'Ga | (!a & Fa)'
 
-run 1 ../../bin/ltlfilt --stutter-invariant -f 'Xa'
+run 1 ../../bin/ltlfilt -q --stutter-invariant -f 'Xa'
 
-run 0 ../../bin/ltlfilt --stutter-invariant -f 'F(!a & Xa & Xb)'
+run 0 ../../bin/ltlfilt -q --stutter-invariant -f 'F(!a & Xa & Xb)'
 
-run 1 ../../bin/ltlfilt --stutter-invariant -f 'F(Xa & Xb)'
+run 1 ../../bin/ltlfilt -q --stutter-invariant -f 'F(Xa & Xb)'
 
 run 0 ../../bin/ltlfilt --remove-x -f 'F(!a & Xa & Xb)' > out
 grep -v X out
-run 0 ../../bin/ltlfilt --stutter-invariant -F 'out'
+run 0 ../../bin/ltlfilt -q --stutter-invariant -F 'out'
 
 
-run 1 ../../bin/ltlfilt --stutter-invariant -f 'F(!a & Xb)'
+run 1 ../../bin/ltlfilt -q --stutter-invariant -f 'F(!a & Xb)'
 run 0 ../../bin/ltlfilt --remove-x -f 'F(!a & Xb)' > out
 grep -v X out
 # The output is stutter invariant, even if the input wasn't.
-run 0 ../../bin/ltlfilt --stutter-invariant -F 'out'
+run 0 ../../bin/ltlfilt -q --stutter-invariant -F 'out'