diff --git a/testing/scripts/diff-canon-notice-policy b/testing/scripts/diff-canon-notice-policy
deleted file mode 100755
index f05abaa103..0000000000
--- a/testing/scripts/diff-canon-notice-policy
+++ /dev/null
@@ -1,10 +0,0 @@
-#! /usr/bin/awk -f
-#
-# A diff canonifier that removes the priorities in notice_policy.log.
-
-/^#/ && $2 == "notice_policy" { filter = 1; }
-
-filter == 1 && /^[^#]/        { sub("^[0-9]*", "X"); }
-
-{ print; }
-
diff --git a/testing/scripts/diff-canonifier-external b/testing/scripts/diff-canonifier-external
index ee6405b3a8..611d7c7baf 100755
--- a/testing/scripts/diff-canonifier-external
+++ b/testing/scripts/diff-canonifier-external
@@ -18,7 +18,6 @@ fi
     | `dirname $0`/diff-remove-uids \
     | `dirname $0`/diff-remove-file-ids \
     | `dirname $0`/diff-remove-x509-names \
-    | `dirname $0`/diff-canon-notice-policy \
     | `dirname $0`/diff-sort \
     | eval $addl
 
diff --git a/testing/scripts/diff-remove-file-ids b/testing/scripts/diff-remove-file-ids
index 965a74442e..b34191f2c8 100755
--- a/testing/scripts/diff-remove-file-ids
+++ b/testing/scripts/diff-remove-file-ids
@@ -1,7 +1,8 @@
-#! /usr/bin/awk -f
+#! /usr/bin/env bash
 #
 # A diff canonifier that removes all file IDs from files.log
 
+awk '
 BEGIN {
     FS="\t";
     OFS="\t";
@@ -28,6 +29,4 @@ process && column1 > 0 && column2 > 0 {
     }
 
 { print }
-
-
-
+'
diff --git a/testing/scripts/diff-remove-mime-types b/testing/scripts/diff-remove-mime-types
deleted file mode 100755
index b8cc3d1e6d..0000000000
--- a/testing/scripts/diff-remove-mime-types
+++ /dev/null
@@ -1,29 +0,0 @@
-#! /usr/bin/awk -f
-#
-# A diff canonifier that removes all MIME types because libmagic output
-# can differ between installations.
-
-BEGIN { FS="\t"; OFS="\t"; type_col = -1; desc_col = -1 }
-
-/^#fields/ {
-    for ( i = 2; i < NF; ++i )
-        {
-        if ( $i == "mime_type" )
-            type_col = i-1;
-        if ( $i == "mime_desc" )
-            desc_col = i-1;
-        }
-}
-
-function remove_mime (n) {
-    if ( n >= 0 && $n != "-" )
-        # Mark that it's set, but ignore content.
-        $n = "+"
-}
-
-remove_mime(type_col)
-remove_mime(desc_col)
-
-{
-    print;
-}
diff --git a/testing/scripts/diff-remove-uids b/testing/scripts/diff-remove-uids
index 8e12b7abe5..3c3faae083 100755
--- a/testing/scripts/diff-remove-uids
+++ b/testing/scripts/diff-remove-uids
@@ -1,7 +1,8 @@
-#! /usr/bin/awk -f
+#! /usr/bin/env bash
 #
 # A diff canonifier that removes all connection UIDs.
 
+awk '
 BEGIN { FS="\t"; OFS="\t"; }
 
 column > 0 {
@@ -16,6 +17,4 @@ column > 0 {
     }
 
 { print }
-
-
-
+'
diff --git a/testing/scripts/diff-remove-x509-names b/testing/scripts/diff-remove-x509-names
index 4534cb7d87..d7c1fe7032 100755
--- a/testing/scripts/diff-remove-x509-names
+++ b/testing/scripts/diff-remove-x509-names
@@ -1,8 +1,9 @@
-#! /usr/bin/awk -f
+#! /usr/bin/env bash
 #
 # A diff canonifier that removes all X.509 Distinguished Name subject fields
 # because that output can differ depending on installed OpenSSL version.
 
+awk '
 BEGIN { FS="\t"; OFS="\t"; s_col = -1; i_col = -1; is_col = -1; cs_col = -1; ci_col = -1; cert_subj_col = -1; cert_issuer_col = -1 }
 
 /^#fields/ {
@@ -27,46 +28,47 @@ BEGIN { FS="\t"; OFS="\t"; s_col = -1; i_col = -1; is_col = -1; cs_col = -1; ci_
 
 s_col >= 0 {
     if ( $s_col != "-" )
-        # Mark that it's set, but ignore content.
+        # Mark that it is set, but ignore content.
         $s_col = "+";
 }
 
 i_col >= 0 {
     if ( $i_col != "-" )
-        # Mark that it's set, but ignore content.
+        # Mark that it is set, but ignore content.
         $i_col = "+";
 }
 
 is_col >= 0 {
     if ( $is_col != "-" )
-        # Mark that it's set, but ignore content.
+        # Mark that it is set, but ignore content.
         $is_col = "+";
 }
 
 cs_col >= 0 {
     if ( $cs_col != "-" )
-        # Mark that it's set, but ignore content.
+        # Mark that it is set, but ignore content.
         $cs_col = "+";
 }
 
 ci_col >= 0 {
     if ( $ci_col != "-" )
-        # Mark that it's set, but ignore content.
+        # Mark that it is set, but ignore content.
         $ci_col = "+";
 }
 
 cert_subj_col >= 0 {
     if ( $cert_subj_col != "-" )
-        # Mark that it's set, but ignore content.
+        # Mark that it is set, but ignore content.
         $cert_subj_col = "+";
 }
 
 cert_issuer_col >= 0 {
     if ( $cert_issuer_col != "-" )
-        # Mark that it's set, but ignore content.
+        # Mark that it is set, but ignore content.
         $cert_issuer_col = "+";
 }
 
 {
     print;
 }
+'