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Top Forums Shell Programming and Scripting how to check for division by zero Post 302279867 by npatwardhan on Saturday 24th of January 2009 10:14:05 AM
Old 01-24-2009
how to check for division by zero

i have a script that is doing the following:

Code:
awk 'BEGIN {FS=","} ; {printf("%.10f",($5 - $2)/(3 * $3))}' data > test

now some records in $3 contain zeroes. i don't want to remove those records. is it possible to check for division by zero and then write a "N/A" for that record in the o/p file (in this case test)?
thanks
 

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TCFTEST(1)							   Tokyo Cabinet							TCFTEST(1)

NAME
tcftest - test cases of the fixed-length database API DESCRIPTION
The command `tcftest' is a utility for facility test and performance test. This command is used in the following format. `path' specifies the path of a database file. `rnum' specifies the number of iterations. `width' specifies the width of the value of each record. `lim- siz' specifies the limit size of the database file. tcftest write [-mt] [-nl|-nb] [-rnd] path rnum [width [limsiz]] Store records with keys of 8 bytes. They change as `00000001', `00000002'... tcftest read [-mt] [-nl|-nb] [-wb] [-rnd] path Retrieve all records of the database above. tcftest remove [-mt] [-nl|-nb] [-rnd] path Remove all records of the database above. tcftest rcat [-mt] [-nl|-nb] [-pn num] [-dai|-dad|-rl] path rnum [limsiz]] Store records with partway duplicated keys using concatenate mode. tcftest misc [-mt] [-nl|-nb] path rnum Perform miscellaneous test of various operations. tcftest wicked [-mt] [-nl|-nb] path rnum Perform updating operations selected at random. Options feature the following. -mt : call the function `tcfdbsetmutex'. -nl : enable the option `FDBNOLCK'. -nb : enable the option `FDBLCKNB'. -rnd : select keys at random. -wb : use the function `tcfdbget4' instead of `tcfdbget2'. -pn num : specify the number of patterns. -dai : use the function `tcfdbaddint' instead of `tcfdbputcat'. -dad : use the function `tcfdbadddouble' instead of `tcfdbputcat'. -rl : set the length of values at random. -ru : perform random operation on random key. This command returns 0 on success, another on failure. SEE ALSO
tcfmttest(1), tcfmgr(1), tcfdb(3), tokyocabinet(3) Man Page 2012-08-18 TCFTEST(1)
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