Test if numeric 1

[wube]

I am currently writing a script that expects input to be keyed in, and I have to verify if the input is numeric or not.
#!/bin/sh
read input
echo $input | awk ' { if ( $0 ~ /[0-9]/ )
printf " input contains numerics only"
else printf " input is mixed mode " } '

The results of testing are as follows :

input result
123 numerics only
123a numerics only
a22 numerics only

How does one check if the whole input is numeric ??

 

[CaKiwi]

Change your regular expression to:

/^[0-9]*$/

Hope this helps.

CaKiwi

 

[wube]

Thanks. That worked. I was on the right track. I did try the following combinations:
/^[0-9]/
/[0-9]+$/
but these did not work.
Once again, thanks a lot.

wube

 

[CaKiwi]

Actually, my solution will treat empty lines as numeric. This will treat them as mixed.

/^[0-9]+$/

CaKiwi