my $shell_code = <<'SHELL';
cleartool lsvob -short | \  
  sort | \  
  sed 's/.*/test -d "&\/." \&\& echoexec cleartool find & -versi +on \"lbtype(LABEL1) \&\& !lbtype(LABEL2)\" -print /' | \
  sh
SHELL
warn "Running >>$shell_code<<";
system($shell_code) == 0
    or die "Couldn't launch >>$shell_code<<: $! / $?";