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Full Discussion: Checking input for being numeric and integers
Top Forums Shell Programming and Scripting Checking input for being numeric and integers Post 302355336 by Gunther on Tuesday 22nd of September 2009 10:32:23 AM
Old 09-22-2009
I don't know about tcsh, but bash has different comparison operators for numbers and strings. So, by applying an arithmetic comparison, I will receive an error message if the operands are strings.
In code:
[code]
#!/bin/bash

if [ $1 -eq $1 2>/dev/null ]; then
echo Is number
else
echo Is NOT a number
fi
 

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LEARN ABOUT DEBIAN

fstrcmpi

fstrcmpi(3)						     Library Functions Manual						       fstrcmpi(3)

NAME

       fstrcmpi - fuzzy comparison of two strings

SYNOPSIS

       #include <fstrcmp.h>
       #define FSTRCMPI_IDENTICAL
       #define FSTRCMPI_THRESHOLD
       #define FSTRCMPI_ERROR
       int fstrcmpi(const char *string1, const char *string2);

DESCRIPTION

       The fstrcmpi() function compares the two strings, string1 and string2.

RETURN VALUE

       The fstrcmpi function returns an int value between 0 and FSTRCMPI_IDENTICAL.  A value of 0 means the strings are utterly un-alike.  A value
       of FSTRCMPI_IDENTICAL means the strings are identical.  A value of more than FSTRCMPI_THRESHOLD (it lies between 0 and  FSTRCMPI_IDENTICAL)
       would be considered "similar" by most people.

       A value of FSTRCMPI_ERROR (always negative) indicates a malloc(3) failure.

SEE ALSO

       fstrcasecmpi(3)
	       compare two strings ignoring case

       fstrcmp(3)
	       fuzzy comparison of two strings

       fmemcmp(3)
	       fuzzy comparison of two memory areas

       strcmp(3)
	       compare two strings

COPYRIGHT

       fstrcmp version 0.4
       Copyright (C) 2009 Peter Miller
       Peter Miller <pmiller@opensource.org.au>

       The  comparison	code  is  derived  from the fuzzy comparison functions in GNU Gettext 0.17.  The GNU Gettext comparison functions were, in
       turn, derived from GNU Diff 2.7.

       Copyright (C) 1988-2009 Free Software Foundation

																       fstrcmpi(3)
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