gaboshlib/gaboshlib/g_traceback.sh

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function g_traceback {
local deptn=${#FUNCNAME[@]}
for ((i=1; i<$deptn; i++)); do
local func="${FUNCNAME[$i]}"
local line="${BASH_LINENO[$((i-1))]}"
local src="${BASH_SOURCE[$((i-1))]}"
printf '%*s' $i '' # indent
echo "at: $func, $src, line $line" 1>&2
done
}