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bc: scope doesn't work for me

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Top Forums Shell Programming and Scripting bc: scope doesn't work for me
# 1  
Old 10-18-2010
bc: scope doesn't work for me
I am trying to use bc to calculate the difference between two nano second time stamps. bc does the calculation but seems to ignore the scale option:

Code:
micro_start=$(date +%s.%N)

# .. some stuff happens here

micro_stop=$(date +%s.%N)

TOT=$(echo "scale=3; $micro_stop - $micro_start" | bc)

echo $micro_start
echo $micro_stop
echo $TOT

This gives:
Code:
1287396929.888596184
1287396930.278798126
.400802946

I cannot figure out what I am dong wrong here.. why is bc ignoring the scale option?

Many Thanks,
Stephen
# 2  
Old 10-18-2010
Need to force rounding by doing a pointless divide:

e.g.
Code:
TOT=$(echo "scale=3; ($micro_stop - $micro_start)/1" | bc)

# 3  
Old 10-18-2010
Amazing......Smilie

Anyway thank you very much for that...
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