Re: Insert the content of a file (with command r?)

Il 25/07/2012 08:59, Davide Brini ha scritto:
> "The a and r commands schedule text for later output. The text specified
> for the a command, and the contents of the file specified for the r
> command, shall be written to standard output just before the next attempt
> to fetch a line of input when executing the N or n commands, or when
> reaching the end of the script. If written when reaching the end of the
> script, and the -n option was not specified, the text shall be written
> after copying the pattern space to standard output. The contents of the
> file specified for the r command shall be as of the time the output is
> written, not the time the r command is applied. The text shall be output in
> the order in which the a and r commands were applied to the input."
> 
> As for the OP's problem, this should work, assuming the pattern never
> occurs on the very last line of the file:
> 
> /pattern/ {
>   r file.txt
>   N
> }
> 
> Given the way "r" works, I'm not sure there's even a way to insert the file
> before the last line of the file with sed only. In that case, one can
> perhaps use dirty shell tricks, like eg
> 
> { cat input.txt; echo; } | sed program.sed | head -n -1

Would it make sense to make the "a" command put the current pattern
space on the append ring, like this?

/pattern/ {
  r file.txt
  a
  d
}

Similarly, "A" would put the cufirst line of pattern space on the append
ring.

Opinions?

Paolo