On Mon, 2012-05-07 at 20:56 +0430, Yasser Zamani wrote: > You're right Simon, Unicodes are two fold. And also I don't know if > 'sed' can edit a binary stream :?
Not safely. Remember, it deals with lines of text - if a stream doesn't consist of lines of text, the output may not be what you expect. > However, in computer academic world, streams are bytes even if they > are not letters e.g. 0x00 and I'm not sure why it's named 'stream > editor' instead of e.g. 'tsed'(text stream editor). Actually, I'd say a stream is any source of data that's read sequentially, rather than in arbitrary order. It could be raw bytes, but might also be characters, or more complex structures (e.g a stream of video frames). > > Actually, that expression which I mentioned is a bit complicated for > who see 'sed' for first time; however, your one is almost completely > unknown for me at this time :S but now, I know enugh about 'sed' to > continue with LFS ;) It's actually not too bad... it's an example of dealing with multiple lines. It finds a line containing 'version', puts it to one side, and then finds the next line containing 'activity'. Having found it, it joins the two lines together, uses a substitution to re-arrange the contents of the combined lines, then prints it. See the 'h', 'H', and 'g' commands in the sed man page for details on how that works. Simon.
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