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to check if a string has only digits

 
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# 1  
Old 11-15-2006
Question to check if a string has only digits
Hi guys,

I am not very experienced in writing ksh scripts and I am trying to write a piece of code that indicates if a given string contains only digits and no alphabet (upper or lower case). If i write it my way it would turn out to have a lot of comparisons.. Smilie

Thanks a lot in Advance.
Last edited by lakshmikanth; 11-16-2006 at 06:35 AM..
# 2  
Old 11-15-2006
Try this

#!/bin/sh
if [ -z "`echo \"$1\" | tr -d \"[:alnum:]\"`" ]
then
echo "True - only alpha and numeric"
else
echo "False - there are NON alpha and numeric stuff here!"
fi
# 3  
Old 11-15-2006
You can use a ksh pattern:

[[ $string = +([0-9]) ]] && echo is numeric
# 4  
Old 11-20-2006
Thanks a lot guys for ur help Smilie
 
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