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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LEARN ABOUT DEBIAN
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)