Tim's niceness fix in safe_mysqld.sh - also a test to see if mail notification works

NOHUP_NICENESS=`nohup nice`

if [ "x$NOHUP_NICENESS" = "x0" ] || ! nice --1 nice >/dev/null 2>&1 ; then

if test $? -ne 0 || test x"$NOHUP_NICENESS" = x0 || test ! nice --1 echo foo > /dev/null 2>&1; then

  NOHUP_NICENESS="nohup"

else

  NOHUP_NICENESS="nice --$NOHUP_NICENESS nohup"

fi

export MYSQL_UNIX_PORT

#export MYSQL_TCP_PORT

touch $err_log; chown $user $err_log