Time command Solaris 11

So all of the scripts so far that I've taken across from Solaris 10 to Solaris 11 have worked. Which is no surprise since I generally use the Bourne shell with the idea that it makes my scripts more acceptable in other environments.

One of my scripts didn't work though. It's a simple little script that writes a test file to the current directory and tells you how long it took.
#!/bin/sh

# This is a quick test of write speed.
# The filesize to write can be specified in gigabytes as a parameter.
# Doubt whether this script works if the test file takes more than 59m to write.
tempfile=gigfile.tmp
if [ $# = 1 ]; then
  filesizeGb=$1
else
  filesizeGb=1
fi
filesizeMb=`expr $filesizeGb \* 1024` || exit 1
# Find out the time taken to write the file
sync
timeforwrite=`time dd bs=1048576 count=$filesizeMb if=/dev/zero of=$tempfile 2>&1 | grep real | awk '{ print $NF }'`
timeforsync=`time sync 2>&1 | grep real | awk '{ print $NF }'`
#Take into account if time for write took more than a minute
if [ "`echo $timeforwrite | grep ':'`" != "" ]; then
  seconds=`echo $timeforwrite | awk -F':' '{ print $NF }'`
  minutes=`echo $timeforwrite | awk -F':' '{ print $1 }'`
  min2sec=`expr $minutes \* 60`
  timeforwrite=`echo "scalar=4;$min2sec+$seconds" | bc`
fi
# Calculate the speed
timetaken=`echo "scalar=4;$timeforwrite+$timeforsync" | bc`
writespeed=`echo "scalar=2;$filesizeMb/$timetaken" | bc`
# Do some cleaning up
[ -f "$tempfile" ] && rm "$tempfile"
echo A "$filesizeGb"Gb file was written in $timetaken seconds at a speed of approximately $writespeed"Mb/s."
exit 0

The error message when running it on Solaris 11 is not important because it incorrectly pointed out "bc" - i.e. my calculator. Looking into the script, I could see that my script wasn't giving bc the correct variables to add - none in fact.

Rather than talk you through everything, here's the conclusion. The "time" command works differently in Solaris 11 in two ways:

1. It always outputs the time in ##m##s format, similar to the way it did in bash in Solaris 10 but not in the Bourne shell.
2. It doesn't pipe into standard error as neatly as it did before. I'll give an example. If I wanted to store in a test file how long it takes the system to echo "hello world", previously I would run command like this: time echo "hello world" 2>output.txt. This doesn't work in Solaris 11, I need to run it like this: (time echo "hello world") 2>output.txt