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Old 08-20-2007, 12:29 PM   #1
mystical dervish
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Registered: May 2007
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arithmethic function inside shell script


I want to evaluate an arithmetic expression, where it's a line of shell script, how can I calculate this expression containig log function

tdf= tf*log(n/F) // this is my expression
I know that shell doesnt support these funcs, but is there a service could be embedded in shell to do that ?? where those variables (n, F, ...) are shell vars
can some one help
 
Old 08-20-2007, 01:00 PM   #2
colucix
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A method could be using gawk, as in
Code:
n=1
F=10
tf=12
tdf=$(echo "$n $F $tf" | gawk '{print $3*log($1/$2)}')
 
Old 08-20-2007, 01:35 PM   #3
Tinkster
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Another alternative would be bc



Cheers,
Tink
 
Old 08-21-2007, 04:57 AM   #4
mystical dervish
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thank you it does work
 
  


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