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Shell arithmetic : operations on decimal points

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# 1  
Old 04-09-2014
Shell arithmetic : operations on decimal points
i am having a varialbe a , which is input to my file
i want to multiply this input with value .43, and assign it to variable b.
i tried it as below:
Code:
#!/bin/sh
a=$1
b=`expr $1\*0.43`
echo b=$b

error : expr: non-integer argument


Please tell me , how to do this.

Thanks
Last edited by Scott; 04-09-2014 at 06:36 AM.. Reason: Please use code tags
# 2  
Old 04-09-2014
This way:
Code:
#!/bin/sh

a=$1
b=$(echo "$a * 0.43"|bc)
echo $b

# 3  
Old 04-09-2014
Hi Klashxx,

if i try that code, it gives error:
Code:
./test: syntax error at line 5: `b=$' unexpected

Last edited by Scott; 04-09-2014 at 07:23 AM.. Reason: Code tags
# 4  
Old 04-09-2014
If you're using an old SH (probably on Solaris), you might have to revert to using backquotes, as in your original code
Code:
b=`...`

You can also use printf in place of bc
Code:
b=`printf "%.2f"  $1*0.43`

# 5  
Old 04-09-2014
Hi Scott,

It would b great if u correct this code itself and show me:

Code:
#!/bin/sh  a=$1 b=$(echo "$a * 0.43"|bc) echo $b

Last edited by Scott; 04-09-2014 at 07:28 AM.. Reason: Code tags
# 6  
Old 04-09-2014
I already did, or so I thought. Do you have all that code on one line? If so, why? If not, please post it as it is in your script. We don't need to be second guessing exactly what you have written.

It would be nice if you used Code Tags so I wouldn't have to spend my time adding them for you.
# 7  
Old 04-09-2014
#!/bin/sh

Code:
a=$1
b=$(echo "$a * 0.43"|bc)
echo $b

---------- Post updated at 04:04 PM ---------- Previous update was at 04:00 PM ----------

Code:
#!/bin/sh

a=$1
b=`printf "%.2f"  $1*0.43`
##b=$(echo "$a * 0.43"|bc)
echo $b

Result:
Code:
printf: 10*0.43: value not completely converted
10.00

expected ans 4.3
Last edited by Scott; 04-09-2014 at 07:35 AM.. Reason: Use code tags, please...
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