wifi недоступен после обновления 17.04 [закрыт]

Другой способ использования Perl:

perl -ne 'BEGIN{ my @buffer } unshift(@buffer, $_); splice(@buffer, 4); if(/\bcommand\b/) { print(reverse(@buffer)); while(<>) { print(); /\bideal\b/ && exit } exit }' file

LINE:
  while (<>) {
      ...             # your program goes here
  }

% cat file
my name is
Mansour
and I confuse to
use sed
or grep for
piping my command output
to get 
my ideal output
% perl -ne 'BEGIN{ my @buffer } unshift(@buffer, $_); splice(@buffer, 4); if(/\bcommand\b/) { print(reverse(@buffer)); while(<>) { print(); /\bideal\b/ && exit } exit }' file
and I confuse to
use sed
or grep for
piping my command output
to get 
my ideal output
%