Bizarre output from svnlite during ports update

[Tim Kientzle]

> On Sep 12, 2016, at 8:15 AM, bob prohaska <fbsd at www.zefox.net> wrote:
> 
> While updating /usr/ports on 11.0-PRERELEASE FreeBSD 11.0-PRERELEASE #0 r305394
> the output of svnlite started out normally and then looked like this:
> 
> A    sysutils/e2fsprogs/files/patch-lib_ext2fs_unix__io.c
> ^[[BU    sysutils/e2fsprogs/distinfo
> ^[[BU    sysutils/rej/Makefile
> ^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[BU    sysutils/burp/Makefile
> ^[[B^[[BU    sysutils/cfengine35/Makefile
> ^[[B^[[BU    sysutils/sbsigntool/Makefile
> ^[[BU    sysutils/libcpuid/Makefile
> ^[[BU    sysutils/debootstrap/distinfo
> ^[[BU    sysutils/duplicity/distinfo
> ^[[BU    sysutils/i7z/Makefile
> ^[[B^[[B^[[B^[[B^[[B^[[B^[[BU    sysutils/dmg2img/Makefile
> ^[[BU    sysutils/cmogstored/Makefile
> ^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[B^[[BU    sysutils/e2fsprogs/Makefile
> U    sysutils/e2fsprogs/files/patch-misc__Makefile.in
> U    sysutils/hploscripts/Makefile
> U    sysutils/boxbackup-devel/Makefile
> 
> before returning to normal.

ESC [ B   is the VT100 command for “cursor down”  (Apparently, you’re not running a VT100-style console?)

So this is not simple gibberish, but rather it looks like something is trying to scroll the screen.  Is it possible that some other program was generating output to the screen at the same time?

Tim