/usr/bin/pruneemptydirs is in kdesdk-scripts 4:17.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50  | #!/bin/sh
# Cleans up a local CVS/SVN tree, by removing directories containing
# remanants of old stuff which has been removed from CVS/SVN
# Those stale dirs often break compilation...
# Works better with srcdir!=builddir (since it will not remove directories
# containing the old executable...)
# NOTE: by default the script doesn't remove anything, just prints what to do
# Copy and paste, or use eval in scripts.
# Use '-f' to force it to happen (use with care, no warranties, etc.!)
# David Faure <faure@kde.org>, script under public domain
force=0;
if [ "$1" = "-f" ]; then force=1; fi
# Look for toplevel dirs
dirs=`find . -type d | grep -v CVS\$ | grep -v admin\$ | grep -v .libs\$ | fgrep -v .svn`
toremove="rm -rf";
for i in $dirs; do if test -d $i; then
  # Short way out, to avoid a full recursive listing from a toplevel module
  if [ -f $i/configure.in.in -o -f $i/Makefile.am ]; then
     :
  else 
    # List their contents and filter out generated files
    realfiles=`find $i -type f | egrep -v  'CVS/|Makefile$|Makefile.in$|Makefile.rules.in$|Makefile.calls.in$|\.o$|\.lo$|\.rpo$|\.la$|\.moc|/\.#' `
    if [ -z "$realfiles" ]; then
      toremove="$toremove $i"
    fi
  fi
fi; done
if [ "$toremove" != "rm -rf" ]; then
  # Do the same in the builddir, if srcdir != builddir
  if [ -n "$OBJ_REPLACEMENT" ]; then
    bdir=`echo $PWD | sed -e "$OBJ_REPLACEMENT"`
    if test -d $bdir; then
      bdcmd="( cd $bdir ; $toremove )"
    fi
  fi
  # Print it or do it
  if [ $force -eq 1 ]; then
    eval $toremove
    eval $bdcmd
  else
    echo $toremove
    echo $bdcmd
  fi
fi
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