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Check if the value is Number

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Top Forums Shell Programming and Scripting Check if the value is Number
# 8  
Old 07-08-2010
Quote:
Originally Posted by anchal_khare
Or, may be with regex?

Code:
awk '$1 !~ /^[0-9]+\.?[0-9]+$/ {print "Error in field 1|" $0}' file1.txt

This gives also an error if the value of the field is a zero (0).
These 2 Users Gave Thanks to Franklin52 For This Post:
ashwin3086 clx
# 9  
Old 07-08-2010
@Franklin:

Thanks for pointing that out!!

I was under the impression that it will not throw an error if its zero. I still dont understand why it is not recognizing 0 as a valid number.Can you explain why it is behaving like that??
# 10  
Old 07-08-2010
Quote:
Originally Posted by ashwin3086
@Franklin:

Thanks for pointing that out!!

I was under the impression that it will not throw an error if its zero. I still dont understand why it is not recognizing 0 as a valid number.Can you explain why it is behaving like that??
Not only a zero but all the values with one number (0-9) gives an error, + matches at least 1 or more numbers:
Code:
^[0-9]+

# 11  
Old 07-09-2010
Quote:
Originally Posted by Franklin52
Not only a zero but all the values with one number (0-9) gives an error, + matches at least 1 or more numbers:
Code:
^[0-9]+

Yes, It wasn't a good try. Thank you for pointing.

@ashwin3086: regarding the explanation of the regular expression, I was looking for "single or more digit followed by optional dot, followed by single or more digit."

So, you can see with the description, that at least two digit must occur to satisfy the condition.

@Franklin52: to be specific, do you think the following would work?

Code:
awk '$1 !~ /^[0-9]+\.?[0-9]*$/ {print "Error in field 1|" $0}'
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