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awk counting question

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# 8  
Old 06-14-2013
Ah, Solaris that be!

Code:
$ echo $((X+0))
ksh: X+0: bad number

# 9  
Old 06-14-2013
HP-UX old
# 10  
Old 06-14-2013
OK sed "s/Solaris/old/", that be!
# 11  
Old 06-14-2013
Furthermore:
Code:
$ echo $(( ' ' ))    
echo $(( ' ' ))
0
$ echo $(( '' ))    
echo $(( '' ))
0
$

ksh needs it less.
# 12  
Old 06-17-2013
Thank you all for your help!
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