diff --git a/modules/compiler_vm/languages/bash.pm b/modules/compiler_vm/languages/bash.pm
index 53b174c4..083bb57c 100755
--- a/modules/compiler_vm/languages/bash.pm
+++ b/modules/compiler_vm/languages/bash.pm
@@ -13,6 +13,12 @@ sub initialize {
   $self->{execfile}        = 'prog.bash';
   $self->{default_options} = '';
   $self->{cmdline}         = 'bash $options $sourcefile';
+
+  $self->{cmdline_opening_comment} = ": <<'____CMDLINE____'\n";
+  $self->{cmdline_closing_comment} = "____CMDLINE____\n";
+
+  $self->{output_opening_comment} = ": << '____OUTPUT____'\n";
+  $self->{output_closing_comment} = "____OUTPUT____\n";
 }
 
 1;
diff --git a/modules/compiler_vm/languages/ksh.pm b/modules/compiler_vm/languages/ksh.pm
index 1c437f03..e89494d0 100755
--- a/modules/compiler_vm/languages/ksh.pm
+++ b/modules/compiler_vm/languages/ksh.pm
@@ -13,6 +13,12 @@ sub initialize {
   $self->{execfile}        = 'prog.ksh';
   $self->{default_options} = '';
   $self->{cmdline}         = 'ksh $options $sourcefile';
+
+  $self->{cmdline_opening_comment} = ": <<'____CMDLINE____'\n";
+  $self->{cmdline_closing_comment} = "____CMDLINE____\n";
+
+  $self->{output_opening_comment} = ": << '____OUTPUT____'\n";
+  $self->{output_closing_comment} = "____OUTPUT____\n";
 }
 
 1;
diff --git a/modules/compiler_vm/languages/perl.pm b/modules/compiler_vm/languages/perl.pm
index 69f8702e..dab48cab 100755
--- a/modules/compiler_vm/languages/perl.pm
+++ b/modules/compiler_vm/languages/perl.pm
@@ -21,6 +21,12 @@ sub postprocess_output {
 
   $self->{output} =~ s/\s+at $self->{sourcefile} line \d+, near ".*?"//;
   $self->{output} =~ s/\s*Execution of $self->{sourcefile} aborted due to compilation errors.//;
+
+  $self->{cmdline_opening_comment} = "=cut =============== CMDLINE ===============\n";
+  $self->{cmdline_closing_comment} = "=cut\n";
+
+  $self->{output_opening_comment} = "=cut =============== OUTPUT ===============\n";
+  $self->{output_closing_comment} = "=cut\n";
 }
 
 1;
diff --git a/modules/compiler_vm/languages/python.pm b/modules/compiler_vm/languages/python.pm
index 30756daa..fe5d0c2d 100755
--- a/modules/compiler_vm/languages/python.pm
+++ b/modules/compiler_vm/languages/python.pm
@@ -13,6 +13,12 @@ sub initialize {
   $self->{execfile}        = 'prog.py';
   $self->{default_options} = '';
   $self->{cmdline}         = 'python $options $sourcefile';
+
+  $self->{cmdline_opening_comment} = "'''\n=============== CMDLINE ===============\n";
+  $self->{cmdline_closing_comment} = "=============== CMDLINE ===============\n'''\n";
+
+  $self->{output_opening_comment} = "'''\n=============== OUTPUT ===============\n";
+  $self->{output_closing_comment} = "=============== OUTPUT ===============\n'''\n";
 }
 
 1;
diff --git a/modules/compiler_vm/languages/python3.pm b/modules/compiler_vm/languages/python3.pm
index 69b23515..13aeab8b 100755
--- a/modules/compiler_vm/languages/python3.pm
+++ b/modules/compiler_vm/languages/python3.pm
@@ -13,6 +13,12 @@ sub initialize {
   $self->{execfile}        = 'prog.py3';
   $self->{default_options} = '';
   $self->{cmdline}         = 'python3 $options $sourcefile';
+
+  $self->{cmdline_opening_comment} = "'''\n=============== CMDLINE ===============\n";
+  $self->{cmdline_closing_comment} = "=============== CMDLINE ===============\n'''\n";
+
+  $self->{output_opening_comment} = "'''\n=============== OUTPUT ===============\n";
+  $self->{output_closing_comment} = "=============== OUTPUT ===============\n'''\n";
 }
 
 1;
diff --git a/modules/compiler_vm/languages/sh.pm b/modules/compiler_vm/languages/sh.pm
index a2165204..2cd57491 100755
--- a/modules/compiler_vm/languages/sh.pm
+++ b/modules/compiler_vm/languages/sh.pm
@@ -13,6 +13,12 @@ sub initialize {
   $self->{execfile}        = 'prog.sh';
   $self->{default_options} = '';
   $self->{cmdline}         = 'sh $options $sourcefile';
+
+  $self->{cmdline_opening_comment} = ": <<'____CMDLINE____'\n";
+  $self->{cmdline_closing_comment} = "____CMDLINE____\n";
+
+  $self->{output_opening_comment} = ": << '____OUTPUT____'\n";
+  $self->{output_closing_comment} = "____OUTPUT____\n";
 }
 
 1;