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awk and printf

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# 1  
Old 04-13-2009
awk and printf
echo $bbsize
1.5

echo $fillpercent

.95

echo $bbsize | awk '{printf "%.2f\n",$0*$fillpercent}'

2.25
echo $bbsize | awk '{printf "%.2f\n",$0*.95}'
1.42

1.42 is what I'm expecting...

echo $blocksize
4096
echo $bbsize | awk '{printf "%.2f\n",$0*$blocksize}'
2.25
echo $bbsize | awk '{printf "%.2f\n",$0*4096}'
6144.00

6144 is what I'm EXPECTING.

Where am I going wrong?
# 2  
Old 04-13-2009
Quote:
Originally Posted by xgringo
echo $bbsize
1.5

echo $fillpercent

.95

echo $bbsize | awk '{printf "%.2f\n",$0*$fillpercent}'

2.25
echo $bbsize | awk '{printf "%.2f\n",$0*.95}'
1.42

1.42 is what I'm expecting...

echo $blocksize
4096
echo $bbsize | awk '{printf "%.2f\n",$0*$blocksize}'
2.25
echo $bbsize | awk '{printf "%.2f\n",$0*4096}'
6144.00

6144 is what I'm EXPECTING.

Where am I going wrong?
you can't use the shell variable inside awk directly
Code:
 
echo 1.5|awk -v var=$fillpercent '{printf "%.2f\n",$0*var}'

this will give the req ans
# 3  
Old 04-13-2009
Quote:
Originally Posted by xgringo
echo $bbsize
1.5

echo $fillpercent

.95

echo $bbsize | awk '{printf "%.2f\n",$0*$fillpercent}'
Code:
echo $bbsize | awk '{printf "%.2f\n",$0*myvar}' myvar="${fillpercent}"

Quote:
Originally Posted by xgringo
2.25
echo $bbsize | awk '{printf "%.2f\n",$0*.95}'
1.42

1.42 is what I'm expecting...

echo $blocksize
4096
echo $bbsize | awk '{printf "%.2f\n",$0*$blocksize}'
Code:
echo $bbsize | awk '{printf "%.2f\n",$0*$blocksize}' myvar="${bbsize}"

Quote:
Originally Posted by xgringo
2.25
echo $bbsize | awk '{printf "%.2f\n",$0*4096}'
6144.00

6144 is what I'm EXPECTING.

Where am I going wrong?
Code:
echo "scale=2; $bbsize * $blocksize" | bc

# 4  
Old 04-14-2009
One thing I'm doing in that script is starting a bb process to run in the background. I'd like to be able to trap the termination of the script and also kill that dd it started in the background. Have any good tips on how to accomplish that?
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