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Old 03-13-2013
Single char

Task 2:

When Im tring script called char that checks a single character on the
command line, c. If the character is a digit, digit is displayed. If the
character is an upper or lowercase alphabetic character, letter is
displayed. Otherwise, other is displayed. Have the script print an
error message if the argument c is more than one character in length.

How to pass the alphabet characters as a argument in case and in if block? How to pass multiple numbers in a single case?
Help!! to correct the code

Code:
#!/bin/ksh
 
c=$1
if [[ c -le 9 ]]
then
echo "Proceed "
elif [[ c -eq a-z ]]
then
echo "alphabet"
else
echo "More than one char in length"
fi
 
case $1 in
 
1-9) echo "The value is a number"
;;
a-z) echo "the value is a alphabet"
;;
*) echo "Other"
;;
esac


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Test Your Knowledge in Computers #943
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The Smurf attack is a DDOS attack in which large numbers of Internet Control Message Protocol (ICMP) packets with the intended victim's spoofed source IP are broadcast to a computer network using an IP broadcast address.
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ISWDIGIT(3)						     Linux Programmer's Manual						       ISWDIGIT(3)

NAME
iswdigit - test for decimal digit wide character SYNOPSIS
#include <wctype.h> int iswdigit(wint_t wc); DESCRIPTION
The iswdigit() function is the wide-character equivalent of the isdigit(3) function. It tests whether wc is a wide character belonging to the wide-character class "digit". The wide-character class "digit" is a subclass of the wide-character class "xdigit", and therefore also a subclass of the wide-character class "alnum", of the wide-character class "graph" and of the wide-character class "print". Being a subclass of the wide character class "print", the wide-character class "digit" is disjoint from the wide-character class "cntrl". Being a subclass of the wide-character class "graph", the wide-character class "digit" is disjoint from the wide-character class "space" and its subclass "blank". Being a subclass of the wide-character class "alnum", the wide-character class "digit" is disjoint from the wide-character class "punct". The wide-character class "digit" is disjoint from the wide-character class "alpha" and therefore also disjoint from its subclasses "lower", "upper". The wide-character class "digit" always contains exactly the digits '0' to '9'. RETURN VALUE
The iswdigit() function returns nonzero if wc is a wide character belonging to the wide-character class "digit". Otherwise, it returns zero. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +-----------+---------------+----------------+ |Interface | Attribute | Value | +-----------+---------------+----------------+ |iswdigit() | Thread safety | MT-Safe locale | +-----------+---------------+----------------+ CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C99. NOTES
The behavior of iswdigit() depends on the LC_CTYPE category of the current locale. SEE ALSO
isdigit(3), iswctype(3) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. GNU
2015-08-08 ISWDIGIT(3)

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