Re^3: Sed -- deleting to line BEFORE regexp match

[Leo de Wit]

In article <2087 at solo9.cs.vu.nl> maart at cs.vu.nl (Maarten Litmaath) writes:
|leo at philmds.UUCP (Leo de Wit) writes:
|\sed "
|\/^diff/{
|\    : again
|\    /new_file1$/b del
|\    /new_file2$/b del
|\
|\       (etc.)
|\
|\    /new_fileN$/b del
|\    b nodel
|\    : del
|\    n
|     ^
|     questionable
|
|\    /^diff/b again
|\    b del
|\    : nodel
|\}"
|
|Huh? From `man sed':
|
|     (2)n Copy the pattern space to the standard output.  Replace
|          the pattern space with the next line of input.
|
|You don't want the pattern space on the standard output. My previous article
|showed a solution using sed's `-n' option.

Slip of the finger, I think. Mine should also have used '-n', in which
case 'n' will not copy implicitly, as you probably are aware of.

	Leo.

P.S. Interesting side issue: is it always possible to convert sed
scripts that are designed for use with '-n', to scripts not using '-n',
and vice versa? If so, design a program (of course preferably a sed
script 8-) to do so.