exec 33<>/dev/tcp/localhost/33333
function _________DEBUG_TRAP ()
{
    local _________DEBUG_COMMAND
    read -u 33 _________DEBUG_COMMAND
    eval $_________DEBUG_COMMAND
}
set -o functrace
trap _________DEBUG_TRAP DEBUG


. _DEBUG.sh
echo $SHELL
a=1234567890
echo ${a}
echo ${a:3}


tamhan@TAMHAN14:~/workspace$ bash ./firsttest.sh
/bin/bash
1234567890
4567890


sudo apt-get install bashdb


tamhan@TAMHAN14:~/workspace$ bashdb ./firsttest.sh
bash debugger, bashdb, release 4.2-0.8
...


::
3: a=1234567890
bashdb<2>


bashdb<6> examine a
declare -- a="1234567890"


function worker {
for i in `seq 1 10`;
do
echo "worker says: " $i
done
}
echo "go!"
worker
echo "end!"


9: echo "go!"
bashdb<0> break worker


break 28
Breakpoint 2 set in file parm.sh, line 28.
break parm.sh:29
Breakpoint 3 set in file parm.sh, line 29.
break 28 if x==5
Breakpoint 4 set in file parm.sh, line 28.


bashdb<1> cont


source /usr/share/bashdb/bashdb-trace
function worker {
. . .
}
echo "go!"
worker
_Dbg_debugger ; : ; :
echo "end!"