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Full Discussion: if $varib contains non-numeric charctr then...
Top Forums Shell Programming and Scripting if $varib contains non-numeric charctr then... Post 302255041 by alex_5161 on Wednesday 5th of November 2008 08:44:25 PM
Old 11-05-2008
What about just negotiation: grep [^0-9] :
Code:
if $(echo $varib|grep [^0-9] &>/dev/null) ; 
then echo WRONG_CHARS_FOUND; 
else echo NOTHING_WRONG; fi

But, generally, why not to check every charactr for any rules:
Code:
var_sz=${#varib}
for (( i=1; i<=var_sz; i++ )); do
  char=$(echo $varib|cut  -c$i); #or : char=${varib:$i-1:1}
  #-now check any validity
done

Although, just to check a valid number, I would prefer that way:
Code:
if ((10#${varib}==$varib)) &>/dev/null ; 
then echo A_NUMBER; 
else ec NOT_A_NMB; fi

Any questions - ask, I will explain.
Last edited by alex_5161; 11-05-2008 at 10:04 PM..
 

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LEARN ABOUT OPENSOLARIS

fmaxf

fmax(3M)						  Mathematical Library Functions						  fmax(3M)

NAME

       fmax, fmaxf, fmaxl - determine maximum numeric value of two floating-point numbers

SYNOPSIS

       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double fmax(double x, double y);

       float fmaxf(float x, float y);

       long double fmaxl(long double x, long double y);

DESCRIPTION

       These functions determine the maximum numeric value of their arguments. NaN arguments are treated as missing data: if one argument is a NaN
       and the other numeric, these functions choose the numeric value.

RETURN VALUES

       Upon successful completion, these functions return the maximum numeric value of their arguments.

       If just one argument is a NaN, the other argument is returned.

       If x and y are NaN, a NaN is returned.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       fdim(3M), fmin(3M), math.h(3HEAD), attributes(5), standards(5)

SunOS 5.11							    12 Jul 2006 							  fmax(3M)
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