diff --git a/crontab-suggest b/crontab-suggest
new file mode 100755
index 0000000..c45bf00
--- /dev/null
+++ b/crontab-suggest
@@ -0,0 +1,17 @@
+#!/bin/bash
+# suggest a random time for a cronjob
+
+set -u
+set -e
+
+hour=$((($RANDOM*24)/32768))
+minute=$((($RANDOM*60)/32768))
+dow="*"
+
+if [ $# -gt 0 ]; then
+  if [ "$1" == "-w" ]; then
+    dow=$((($RANDOM*7)/32768))
+  fi
+fi
+
+printf "%02i %02i * * %s\n" "$minute" "$hour" "$dow"
diff --git a/find-junk b/find-junk
index f714cf0..4416799 100755
--- a/find-junk
+++ b/find-junk
@@ -14,7 +14,8 @@ M = 1024*1024
 def junk_dirs():
     """Return directories which potentially contain junk"""
 
-    for d in ['~/tmp', '~/.local/share/Trash', '~/rpmbuild', '~/RPM']:
+    for d in ['~/tmp', '~/.local/share/Trash', '~/rpmbuild', '~/RPM',
+              '~/.cache/tracker']:
         d = os.path.expanduser(d)
         if os.path.exists(d):
             yield d
diff --git a/gpg-sync-keys b/gpg-sync-keys
new file mode 100755
index 0000000..89eb3fc
--- /dev/null
+++ b/gpg-sync-keys
@@ -0,0 +1,23 @@
+#!/bin/sh
+# sync gpg public keys between localhost and the specified hosts
+#
+#   gpg-sync-keys host1 [host2 ...]
+#
+
+#GPG="gpg -q --batch"
+GPG=gpg
+
+hosts=$@
+
+for host in $hosts; do
+  echo "Importing from $host ..."
+  ssh -C $host $GPG --export | $GPG --import
+done
+
+#echo "Refreshing keys ..."
+#$GPG --refresh-keys
+
+for host in $hosts; do
+  echo "Exporting to $host ..."
+  $GPG --export | ssh -C $host $GPG --import
+done