Executed in subshell, trap on exit

#!/bin/bash
# --- subshell_trap.sh -------------------------------------------------
# Example script for handling bash errors.  Exit on error.  Trap exit.
# This script is supposed to run in a subshell.
# See also: http://fvue.nl/wiki/Bash:_Error_handling

    # Let shell functions inherit ERR trap.  Same as `set -E'.
set -o errtrace 
    # Trigger error when expanding unset variables.  Same as `set -u'.
set -o nounset
    #  Trap non-normal exit signals: 1/HUP, 2/INT, 3/QUIT, 15/TERM, ERR
    #  NOTE1: - 9/KILL cannot be trapped.
    #+        - 0/EXIT isn't trapped because:
    #+          - with ERR trap defined, trap would be called twice on error
    #+          - with ERR trap defined, syntax errors exit with status 0, not 2
    #  NOTE2: Setting ERR trap does implicit `set -o errexit' or `set -e'.
trap onexit 1 2 3 15 ERR


#--- onexit() -----------------------------------------------------
#  @param $1 integer  (optional) Exit status.  If not set, use `$?'

function onexit() {
    local exit_status=${1:-$?}
    echo Exiting $0 with $exit_status
    exit $exit_status
}



# myscript



    # Allways call `onexit' at end of script
onexit