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Alex Rivera
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It looks like the 'N' command works on every other line: $ cat in.txt a b c d $ sed '=;N' in.txt 1 a b 3 c d Maybe that would be natural because command 'N' joins the next line and changes the current line number. But (I saw this here ): $ sed 'N;$!P;$!D;$d' thegeekstuff.txt The above example deletes the last two lines of a file. This works not only for even-line-numbered files but also for odd-line-numbered files. In this example 'N' command runs on every line. What's the difference? And could you tell me why I cannot see the last line when I run sed like this: # sed N odd-lined-file.txt
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