03-31-2008
I'm not sure where you are going with this... What will it accomplish to convert a file containing legitimate 8-bit characters into pure 7-bit representations?? Is this what you mean by ASCII (really "text"), the first 128 characters of the 256 character UTF-8 set character set???
To do the above requires that 8-bit characters be represented as 2 7-bit characters. One very early way of doing this (for file attachments when there was no other way to "attach" binary files to email) was/is called uuencode (and uudecode to change it back to original form). Your unix system will have some man pages on this program. But again I'm not sure what you are really talking about. If this was a regular TEXT file transmitted in BINARY mode by mistake then the only thing you might have to do is translate line endings -- CR/LF [windows] to LF [unix] for example. If that is what is going on you could use a simple sed script to strip CR (ascii character 13, 0d in hex)...
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LEARN ABOUT LINUX
uuencode
UUENCODE(5) File Formats Manual UUENCODE(5)
NAME
uuencode - format of an encoded uuencode file
DESCRIPTION
Files output by uuencode(1) consist of a header line, followed by a number of body lines, and a trailer line. The uudecode(1) command will
ignore any lines preceding the header or following the trailer. Lines preceding a header must not, of course, look like a header.
The header line is distinguished by having the first 6 characters begin The word begin is followed by a mode (in octal), and a string
which names the remote file. A space separates the three items in the header line.
The body consists of a number of lines, each at most 62 characters long (including the trailing newline). These consist of a character
count, followed by encoded characters, followed by a newline. The character count is a single printing character, and represents an inte-
ger, the number of bytes the rest of the line represents. Such integers are always in the range from 0 to 63 and can be determined by sub-
tracting the character space (octal 40) from the character.
Groups of 3 bytes are stored in 4 characters, 6 bits per character. All are offset by a space to make the characters printing. The last
line may be shorter than the normal 45 bytes. If the size is not a multiple of 3, this fact can be determined by the value of the count on
the last line. Extra garbage will be included to make the character count a multiple of 4. The body is terminated by a line with a count
of zero. This line consists of one ASCII space.
The trailer line consists of end on a line by itself.
SEE ALSO
uuencode(1), uudecode(1), uusend(1), uucp(1), mail(1)
HISTORY
The uuencode file format appeared in BSD 4.0 .
UUENCODE(5)