urxvt -pe extension-name
Extensions that use resources for configuration are loaded automatically when their resources are specified as command-line switches. Any extension can be loaded explicitly with the "-pe" switch.
bell-command - execute a command when the bell rings
block-graphics-to-ascii - map block graphics to ascii characters
clipboard-osc - implement the clipboard operating system command sequence
confirm-paste - ask for confirmation before pasting multiline text
digital-clock - display a digital clock overlay
eval - evaluate arbitrary perl code using actions
example-refresh-hooks - example of how to use refresh hooks
keysym-list - implement the ``list'' keysym expansion.
kuake - kuake-like hotkey terminal
matcher - match strings in terminal output and change their rendition
option-popup - option menu (enabled by default)
overlay-osc - implement OSC to manage overlays
readline - improve readline editing (enabled by default)
remote-clipboard - manage a shared and possibly remote clipboard
searchable-scrollback - incremental scrollback search (enabled by default)
selection - more intelligent selection (enabled by default)
selection-autotransform - automatically transform select text
selection-pastebin - automatic pastebin upload
selection-popup (enabled by default)
selection-to-clipboard - copy the selection to the clipboard each time a selection is made
tabbed - tabbed interface to urxvt
xim-onthespot - implement XIM ``on-the-spot'' behaviour