add and improve @procrat's profile_bash

local/bin/profile_bash.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+#
+# Assumes file descriptor 3 is not messed with in the profiled script.
+
+pid=$$
+exec 3>&2 2> >(tee /tmp/bash_profile-${pid}.log | \
+               sed -u 's/^.*$/now/' | \
+               date -f - +%s.%N >/tmp/bash_profile-${pid}.tim)
+set -x
+
+. "$@"
+
+set +x
+exec 2>&3 3>&-
+
+paste <(
+    while read tim ;do
+        crt=000000000$((${tim//.}-10#0$last))
+        printf "%12.9f\n" ${crt:0:${#crt}-9}.${crt:${#crt}-9}
+        last=${tim//.}
+    done < /tmp/bash_profile-${pid}.tim
+) /tmp/bash_profile-${pid}.log > ${pid}.timings
+
+accumulator='
+{
+    sum[$2] += $1
+    count[$2] += 1
+}
+END {
+    printf("command\ttotal\ttimes\taverage\n")
+    for (key in sum) {
+        printf("%s\t%f\t%d\t%f\n", key, sum[key], count[key], sum[key] / count[key])
+    }
+}
+'
+
+paste \
+    <(cut -f1 ${pid}.timings) \
+    <(cat /tmp/bash_profile-${pid}.log \
+        | sed '/\] *=/c [[assignement]]' \
+        | sed -n 's/++* \([^ ]*\).*/\1/p' \
+        | sed '/=/c [[assignment]]') \
+    | > ${pid}.acc awk "$accumulator"
+
+rm /tmp/bash_profile-${pid}.{tim,log}
+echo ${pid}.timings