02-28-2013
Quote:
Originally Posted by
jediwannabe
. . .
understand that we can append anything to the footer of a file by doing the following
echo "prompt done loading" > filename.txt but how about appending the header?
thanks a lot!
If you do that, your filename.txt will be gone. Use
>> for appending.
Put header in a headerfile and then
cat headerfile filename.txt
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LEARN ABOUT REDHAT
yencode
yencode(n) encode/decoding a binary file yencode(n)
NAME
yencode - encode/decoding a binary file
SYNOPSIS
package require Tcl 8
package require yencode ?1.0?
::yencode::encode string
::yencode::decode string
::yencode::yencode ?-name string? ?-line integer? ?-crc32 boolean? (-file filename | ?--? string)
::yencode::ydecode (-file filename | ?--? string)
DESCRIPTION
This package provides a Tcl-only implementation of the yEnc file encoding. This is a recently introduced method of encoding binary files
for transmission through usenet. This encoding packs binary data into a format that requires an 8-bit clean transmission layer but that
escapes characters special to the NNTP posting protocols. See http://www.yenc.org/ for details concerning the algorithm.
::yencode::encode string
returns the yEnc encoded data.
::yencode::decode string
Decodes the given yEnc encoded data.
::yencode::yencode ?-name string? ?-line integer? ?-crc32 boolean? (-file filename | ?--? string)
Encode a file or block of data.
::yencode::ydecode (-file filename | ?--? string)
Decode a file or block of data. A file may contain more than one embedded file so the result is a list where each element is a three
element list of filename, file size and data.
OPTIONS
-filename name
Cause the yencode or ydecode commands to read their data from the named file rather that taking a string parameter.
-name string
The encoded data header line contains the suggested file name to be used when unpacking the data. Use this option to change this
from the default of "data.dat".
-line integer
The yencoded data header line contains records the line length used during the encoding. Use this option to select a line length
other that the default of 128. Note that NNTP imposes a 1000 character line length limit and some gateways may have trouble with
more than 255 characters per line.
-crc32 boolean
The yEnc specification recommends the inclusion of a cyclic redundancy check value in the footer. Use this option to change the
default from true to false.
% set d [yencode::yencode -file testfile.txt]
=ybegin line=128 size=584 name=testfile.txt
-o- data not shown -o-
=yend size=584 crc32=ded29f4f
KEYWORDS
encoding, uuencode, yEnc, yencode, ydecode
base64 1.0 yencode(n)