My earlier post about deleting the first N lines was answered by
        this one-liner site {below}.   I wasn't including any
        redirection; doing so finally resolved the problem.  Now I need
        to delete every line from the 19th or so to the last line.
        Question one, can anybody explain the following syntax?  What do
        "P", "D" "ba" represent, in other words?

 # delete the last 10 lines of a file
 sed -e :a -e '$d;N;2,10ba' -e 'P;D'   # method 1
 sed -n -e :a -e '1,10!{P;N;D;};N;ba'  # method 2

        Question two, can sed do its thing inline?

        thanks in advance,


  Gary Kline  [EMAIL PROTECTED]  Public Service Unix

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