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Top Forums Shell Programming and Scripting Ommiting special characters as input - Help Post 302472434 by Scrutinizer on Wednesday 17th of November 2010 07:14:16 AM
Old 11-17-2010
Or use:
bash code:
  1. if [[ $letter == [[:alpha:]] ]]; then
  2.   echo $letter
  3.  else
  4.   echo "Invalid input. Input is not a letter"
  5. fi

or use:
shell code:
  1. case $letter in  
  2.   [[:alpha:]]) echo $letter ;;
  3.   *) "Invalid input. Input is not a letter" ;;
  4. esac

Last edited by Scrutinizer; 11-17-2010 at 08:31 AM..
 

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TOWLOWER(3)						   BSD Library Functions Manual 					       TOWLOWER(3)

NAME
towlower, towlower_l -- upper case to lower case letter conversion (wide character version) LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <wctype.h> wint_t towlower(wint_t wc); #include <wctype.h> #include <xlocale.h> wint_t towlower_l(wint_t wc, locale_t loc); DESCRIPTION
The towlower() function converts an upper-case letter to the corresponding lower-case letter. Although the towlower() function uses the current locale, the towlower_l() function may be passed a locale directly. See xlocale(3) for more information. RETURN VALUES
If the argument is an upper-case letter, the towlower() function returns the corresponding lower-case letter if there is one; otherwise, the argument is returned unchanged. SEE ALSO
iswlower(3), tolower(3), towupper(3), wctrans(3), xlocale(3) STANDARDS
The towlower() function conforms to ISO/IEC 9899:1999 (``ISO C99''). BSD
October 3, 2002 BSD
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