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problem in assigning substr to a variable inside awk

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# 1  
Old 11-13-2010
Java problem in assigning substr to a variable inside awk
Hi All,

I have a fixed-width datafile from which i need to extract value/string starting from some position to the specified length in each of the lines.

awk '{print substr($0,x,y)}' datafile --- is working fine

but

awk 'BEGIN{a=0}{a=substr($0,x,y);print $a}' datafile ---is giving unexpected resultsSmilie

Is there any limitation in using substr() in awk?

Also why can't we use ${str:x:y} instead of substr? If yes let me know how.

This is my first post in this forum.
Thanks in advance.
# 2  
Old 11-13-2010
Quote:
Originally Posted by loggedin.ksh
Also why can't we use ${str:x:y} instead of substr? If yes let me know how.
Because it'shell, not awk syntax.
This should provide the same result (after replaceing x, y by their numeric equivalents (NB: index start at 0):
Code:
while read; do echo "${REPLY:x:y}"; done < datafile

$REPLY is the default content of read if no variable name is given.
# 3  
Old 11-13-2010
Also use: print a instead of print $a inside awk..
This User Gave Thanks to Scrutinizer For This Post:
loggedin.ksh
# 4  
Old 11-13-2010
Now i'm able to get valid results.
Thanks for your immediate replies.Smilie
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