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Top Forums Shell Programming and Scripting Send/receive file through serial using minicom Post 302912876 by linuxmember on Tuesday 12th of August 2014 11:41:25 AM
Old 08-12-2014
hi corona, sorry for asking this, but could you explain your code. my scripting skills are limited.
base64 -d > /tmp/$$ <<"EOF" This seems to decode some data and add it to a file and appends and EOF at the end.
1. Which data does it decode and what does $$ mean?
set -- $(md5sum /tmp/$$)
2. what does "set --" do to the checksum calculated?
if ! [ "$1" = "0e..." ]
3. $1 is ? (first argument for?)

With my limited scripting skills it is difficult for me to understand in which step a RS232 transfer is taking place
 

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MIME::Base64::URLSafe(3pm)				User Contributed Perl Documentation				MIME::Base64::URLSafe(3pm)

NAME
MIME::Base64::URLSafe - Perl version of Python's URL-safe base64 codec SYNOPSIS
use MIME::Base64::URLSafe; $encoded = urlsafe_b64encode('Alladdin: open sesame'); $decoded = urlsafe_b64decode($encoded); DESCRIPTION
This module is a perl version of python's URL-safe base64 encoder / decoder. When embedding binary data in URL, it is preferable to use base64 encoding. However, two characters ('+' and '/') used in the standard base64 encoding have special meanings in URLs, often leading to re-encoding with URL-encoding, or worse, interoperability problems. To overcome the problem, the module provides a variation of base64 codec compatible with python's urlsafe_b64encode / urlsafe_b64decode. Modification rules from base64: use '-' and '_' instead of '+' and '/' no line feeds no trailing equals (=) The following functions are provided: urlsafe_b64encode($str) urlsafe_b64decode($str) If you prefer not to import these routines to your namespace, you can call them as: use MIME::Base64::URLSafe (); $encoded = MIME::Base64::URLSafe::encode($decoded); $decoded = MIME::Base64::URLSafe::decode($encoded); SEE ALSO
MIME::Base64 Fore more discussion on using base64 encoding in URL applications, see: http://en.wikipedia.org/wiki/Base64#URL_Applications AUTHOR
Kazuho Oku <kazuho ___at___ labs.cybozu.co.jp> Copyright (C) 2006 Cybozu Labs, Inc. This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.7 or, at your option, any later version of Perl 5 you may have available. perl v5.8.8 2006-01-05 MIME::Base64::URLSafe(3pm)
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