script fixups

tools/savechanges

@@ -1,11 +1,20 @@
 #!/bin/bash
 
 TMP=/tmp/changes$$
-EXCLUDE="^\$|/\$|[.]wh[.][.]wh[.]orph/|^[.]wh[.][.]wh[.]plnk/|^[.]wh[.][.]wh[.]aufs|^var/cache/|^var/backups/|^var/tmp/|^var/log/|^var/lib/apt/|^var/lib/dhcp/|^var/lib/systemd/|^sbin/fsck[.]aufs|^etc/resolv[.]conf|^root/.Xauthority|^root/.xsession-errors|^etc/mtab|^etc/fstab|^boot/|^dev/|^mnt/|^proc/|^run/|^sys/|^tmp/"
+EXCLUDE="^\$|/\$|[.]wh[.][.]wh[.]orph/|^[.]wh[.][.]wh[.]plnk/|^[.]wh[.][.]wh[.]aufs|^var/cache/|^var/backups/|^var/tmp/|^var/log/|^var/lib/apt/|^var/lib/dhcp/|^var/lib/systemd/|^sbin/fsck[.]aufs|^etc/resolv[.]conf|^root/[.]Xauthority|^root/[.]xsession-errors|^root/[.]fehbg|^root/[.]fluxbox/lastwallpaper|^etc/mtab|^etc/fstab|^boot/|^dev/|^mnt/|^proc/|^run/|^sys/|^tmp/"
 CHANGES=/mnt/live/memory/changes
 
 if [ "$1" = "" ]; then
-   echo "Usage: $0 [ target_file.sb ] [ optional_changes_directory ]"
+   echo ""
+   echo "savechanges - save all changed files in a compressed filesystem bundle"
+   echo "            - excluding some predefined files such as /etc/mtab,"
+   echo "              temp & log files, empty directories, apt cache, and such"
+   echo ""
+   echo "Usage:"
+   echo "        $0 [ target_file.sb ] [ changes_directory ]"
+   echo ""
+   echo "If changes_directory is not specified, /mnt/live/memory/changes is used."
+   echo ""
    exit 1
 fi