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bc question

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# 1  
Old 03-09-2009
bc question
i'm trying to parse a file with lines like the below where i need to get a diff on the 169-182 so that the result is 13 for instance. I was looking into using bc but am not that familiar with embedding it in a script.

john8:9. 169-182

any ideas are appreciated!
# 2  
Old 03-09-2009
Hammer & Screwdriver
Code:
echo "john8:9. 169-182" | cut -d" " -f2 | awk -F"-" '{print $2-$1}'
13

# 3  
Old 03-09-2009
Code:
echo "john8:9. 169-182" | awk '{print "(" $2 ")*-1"}' | bc

# 4  
Old 03-09-2009
many thanks; another question
thanks joeyg and pludi. I understand your commands now so thanks. i'm trying to send a filename so would it be the following?

cut -d" " -f2 filename | awk -F"-" '{print $2-$1}'
# 5  
Old 03-09-2009
Tools
In that example, your filename is an input to the rest of the command.
# 6  
Old 03-09-2009
getting it
ok, i'm doing something more like this

awk -F" -+" '{print $3 " " $7-$6+1}' L220090213RetransRequests.log

the ibm site is goog for awk teaching:

Common threads: Awk by example, Part 1

thanks again!
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