What can i do to check that the input is all alphabet.. ? Post: 15751

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afternoon forums. I need to get a way of testing as to wether an inputed character is part of the english alphabet. i have come up with the following code but its not working at all. until '] do echo This is not a Letter done any help would be beneficial to me.

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base64

BASE64(1)							   User Commands							 BASE64(1)

NAME

       base64 - base64 encode/decode data and print to standard output

SYNOPSIS

       base64 [OPTION]... [FILE]

DESCRIPTION

       Base64 encode or decode FILE, or standard input, to standard output.

       -d, --decode
	      decode data

       -i, --ignore-garbage
	      when decoding, ignore non-alphabet characters

       -w, --wrap=COLS
	      wrap encoded lines after COLS character (default 76).  Use 0 to disable line wrapping

       --help display this help and exit

       --version
	      output version information and exit

       With no FILE, or when FILE is -, read standard input.

       The  data  are  encoded as described for the base64 alphabet in RFC 3548.  When decoding, the input may contain newlines in addition to the
       bytes of the formal base64 alphabet.  Use --ignore-garbage to attempt to recover from any other non-alphabet bytes in the encoded stream.

AUTHOR

       Written by Simon Josefsson.

REPORTING BUGS

       Report base64 bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report base64 translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2011 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The full documentation for base64 is maintained as a Texinfo manual.  If the info and base64 programs are properly installed at your  site,
       the command

	      info coreutils 'base64 invocation'

       should give you access to the complete manual.

GNU coreutils 8.12.197-032bb					  September 2011							 BASE64(1)

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checking wether an input is using letters of the alphabet

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