[SOLVED] Get function backtrace in bash from trap handler (using caller)

Get function backtrace in bash from trap handler (using caller)

I know that you can use 'caller' to get a backtrace of function calls in bash:

#! /bin/bash
Backtrace () {
   echo "Backtrace is:"
   i=0
   while caller $i
   do
      i=$((i+1))
   done
}
myFunc () {
   Backtrace
}
myFunc

Prints:

Backtrace is:
11 myFunc ./test.sh
13 main ./test.sh

My question is, lets say I have a script which uses 'set -e' to terminate on any unchecked failure. Is it possible to get a line number of where the script failed (and its callers)

I've tried naively doing: trap 'Backtrace' EXIT, but that gives me '1 main ./test.sh' rather than the line number of the failing command

Solution

I'm not sure if it will work, but try adding ERR to your list of trap'd signals. Maybe your code will be invoked before the set -e stuff takes over, in which case you'll be back in business.