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Awk - Two equations?

 
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# 1  
Old 12-09-2010
Awk - Two equations?
I really know barely anything about awk and the like but I have a bit of code I need help with.

The bash script is meant to get my usage numbers from my ISP and it does so perfectly. However I want to know how much I can use each day. So to do this I would need to divide its output by the number of days left on my quota. Here is the part I am stuck at:

Code:
echo $peak $days_remaining |awk '{ printf "Per day:         %.2f GB\n", (50-($1/1000000000)) }'

Which would output something like '19.36 GB' with the rest of the code. I know that adding '/$2' to the output would give the desired number but I'm not sure how to go about it.

Any ideas?
# 2  
Old 12-09-2010
Code:
set `expr 50 - $peak / 1000000000` | awk '{ printf "Use %.2f GB per day of total %.2f GB free.\n", ($1 / $days_remaining), $1}'

This User Gave Thanks to For This Post:
Light_
R0H0N
# 3  
Old 12-09-2010
Thanks for the quick response. I put your formatted line in but at first it produced nothing in terminal. I then added echo to the start and it produced:

Code:
awk: illegal field $(), name "days_remaining"
 input record number 1, file 
 source line number 1

# 4  
Old 12-09-2010
Code:
set `expr 50 - $peak / 1000000000` | echo $1 $days_remaining | awk '{ printf "Use %.2f GB per day of total %.2f GB free.\n", ($1 / $2), $1}'

This User Gave Thanks to For This Post:
Light_
R0H0N
# 5  
Old 12-09-2010
Quote:
Originally Posted by Light_
Code:
echo $peak $days_remaining |awk '{ printf "Per day:         %.2f GB\n", (50-($1/1000000000)) }'

Which would output something like '19.36 GB' with the rest of the code. I know that adding '/$2' to the output would give the desired number but I'm not sure how to go about it.

Any ideas?
Isn't this what you want...

Code:
echo $peak $days_remaining |awk '{ printf "Per day:         %.2f GB\n", (50-($1/1000000000))/$2 }'

Just added /$2 to your code
This User Gave Thanks to malcomex999 For This Post:
Light_
# 6  
Old 12-09-2010
Quote:
Originally Posted by R0H0N
Code:
set `expr 50 - $peak / 1000000000` | echo $1 $days_remaining | awk '{ printf "Use %.2f GB per day of total %.2f GB free.\n", ($1 / $2), $1}'

Code:
awk: division by zero
 input record number 1, file 
 source line number 1

---------- Post updated at 03:36 AM ---------- Previous update was at 03:32 AM ----------

Quote:
Originally Posted by malcomex999
Isn't this what you want...

Code:
echo $peak $days_remaining |awk '{ printf "Per day:         %.2f GB\n", (50-($1/1000000000))/$2 }'

Just added /$2 to your code
That works. Odd though, as I tried that earlier and it didn't produce the same result. Thank you and R0H0N also for helping troubleshoot.
 
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