I am using Debian - Jessie I managed to change the default window border thickness by editing the appropriate theme .xml file. In this case:/usr/share/themes/BlueMenta/metacity-1/metacity-theme-1.xmlHow would I go about doing this for all themes? (I have to change this on multiple machines and they are all using different/custom themes).Another option is to try and figure out the theme being used and use that info to make changes to an appropriate file but:gsettings get org.gnome.desktop.interface gtk-themeAlways shows 'Adwaita' even though its not being used. Can I utilize /usr/share/themes/Default somehow to change this globally, no matter what theme is being used?Thanks a bunch!UPDATEactually this is showing the correct theme being used in real time:gsettings get org.mate.interface gtk-themewhich narrows it down at least so I can modify only the correct file.UPDATE-2I ended up writing a script that would replace the left/right_width and bottom_height parameters in the config file of the theme that is being used by a certain user.Usage: run the script with the username as the parameter. #!/bin/bashif [[ -z $1 ]]; then  echo 'No params provided' && exit 1 ; fithemeRootDir=/usr/share/themes/backupDir=/opt/theme_backup$(date +%d-%m-%H%M%S)themeUsed=$(sudo su -c gsettings get org.mate.interface gtk-theme | tr -d '\'\' $1)if ! [[ -d $backupDir ]]; then  mkdir $backupDir ; fiif ! [[ -z themeUsed ]]; then  rsync -av $themeRootDir$themeUsed $backupDir;  echo Theme configuration backup: $backupDir; elseecho 'Theme could not be located' && exit 1 ; fifor xml in $(find $themeRootDir$themeUsed -name 'metacity*.xml'); do  sed -i '/distance name=left_width/c<distance name=left_width value=10/>' $xml  sed -i '/distance name=right_width/c<distance name=right_width value=10/>' $xml  sed -i '/distance name=bottom_height/c<distance name=bottom_height value=10/>' $xmldone
Change thickness of window borders for all themes
debian;theme;size