#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
#
# Test correct trap return codes = 2 means skip execution.
shopt -s extdebug
print_trap() {
   echo "lineno: $1 ($LINENO) ${FUNCNAME[1]}"
   if [[ $debug_exit == 2 ]] ; then
     debug_exit=0
     return 2
   fi
   return 0
}

debug_exit=0
trap 'print_trap $LINENO' DEBUG

x=1
echo "x is $x"
debug_exit=2
x=2
echo "x is $x"