[РЕШЕНО] Как вывести grep несколько строк до и после. "контекст"

Из grep в man:

Context Line Control
   -A NUM, --after-context=NUM
          Print NUM lines of trailing context after matching lines.  Places a line containing a group
separator (--) between contiguous groups of matches.  With the -o or --only-matching option, this has
no effect and a warning is given.

   -B NUM, --before-context=NUM
          Print NUM lines of leading context before matching lines.  Places a line containing a group
separator (--) between contiguous groups of matches.  With the -o or --only-matching option, this has
no effect and a warning is given.

   -C NUM, -NUM, --context=NUM
          Print NUM lines of output context.  Places a line containing a group separator (--) between
contiguous groups of matches.  With the -o or --only-matching option, this has no effect and a
warning is given.


Примеры работы.

-A (after – после):
-B (before – перед):
-C (conext – контекст, до и после):
-A и -B можно совмещать: