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uuencode    
加码方法之一,能将二进位资料转换成ASCII的档案

加码方法之一,能将二进位资料转换成ASCII的档案

(Unix-to-Unix encode) A {Unix} program for
encoding {binary} data as {ASCII}. Uuencode was originally
used with {uucp} to transfer binary files over {serial lines}
which did not preserve the top bit of characters, but is now
used for sending binary files by {e-mail} and posting to
{Usenet} newsgroups etc. The program uudecode reverses the
effect of uuencode, recreating the original binary file
exactly.

Uuencoded data starts with a line of the form

begin

where is the files read/write/execute permissions as
three {octal} digits and is the name to be used when
recreating the binary data.

Uuencode repeatedly takes in a group of three bytes, adding
trailing zeros if there are less than three bytes left. These
24 bits are split into four groups of six which are treated as
numbers between 0 and 63. Decimal 32 is added to each number
and they are output as ASCII characters from 32 (space) to
3263 = 95 (underscore). Each group of sixty output
characters (corresponding to 45 input bytes) is output as a
separate line preceded by an 'M' (ASCII code 77 = 3245). At
the end of the input, if there are N output characters left
after the last group of sixty and N>0 then they will be
preceded by the character whose code is 32N. Finally, a line
containing just a single space is output, followed by one
containing just "end".

Sometimes each data line has an extra dummy character added to
avoid problems which mailers that strip trailing spaces.
These characters are ignored by uudecode.

Despite using this limited range of characters, there are
still some problems encountered when uuencoded data passes
through certain old computers. The worst offenders are
computers using non-ASCII character sets such as EBCDIC.

{Base 64} encoding is probably now more commonly used than
uuencode.

(2004-07-17)


请选择你想看的字典辞典:
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UUencode查看 UUencode 在百度字典中的解释百度英翻中〔查看〕
UUencode查看 UUencode 在Google字典中的解释Google英翻中〔查看〕
UUencode查看 UUencode 在Yahoo字典中的解释Yahoo英翻中〔查看〕





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  • YouTube
    Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube
  • YouTube - Apps on Google Play
    Enjoy your favorite videos and channels with the official YouTube app
  • YouTube - Wikipedia
    Established media, news, and entertainment corporations have also created and expanded their visibility on YouTube channels to reach bigger audiences YouTube has had unprecedented social impact, influencing popular culture, internet trends, and creating multimillionaire celebrities
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    Supports multiple accounts - Everyone at home can sign into YouTube with a Google account to see recommendations, subscriptions, and playlists Play YouTube videos from your phone on the TV - It’s easy to enjoy videos with friends and family Simply find the videos you want to watch on your phone, then send them to your TV with a single tap
  • YouTube Kids
    YouTube Kids provides a more contained environment for kids to explore YouTube and makes it easier for parents and caregivers to guide their journey
  • ‎YouTube App - App Store
    Download YouTube by Google on the App Store See screenshots, ratings and reviews, user tips, and more apps like YouTube
  • History of YouTube - Wikipedia
    YouTube logo since October 22, 2024 Design history of the video player used by YouTube Each layout generation might have gone through minor undocumented iterations, and that appearance may vary with embedding parameters YouTube is an American online video-sharing platform headquartered in San Bruno, California, founded by three former PayPal employees— Chad Hurley, Steve Chen, and Jawed
  • YouTube Music
    With the YouTube Music app, enjoy over 100 million songs at your fingertips, plus albums, playlists, remixes, music videos, live performances, covers, and hard-to-find music you can’t get
  • About YouTube - YouTube
    YouTube's mission is to give everyone a voice and show them the world Learn about our brand, community, careers and more
  • YouTube | History, Founders, Purchase, Facts | Britannica
    YouTube is a social media platform and video sharing website owned by Alphabet, Inc It was registered on February 14, 2005, by Steve Chen, Chad Hurley, and Jawed Karim, three former employees of the American e-commerce company PayPal They had the idea that ordinary people would enjoy sharing their ‘home videos ’





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