Что такое опции «self» и «master» в «bridge vlan add»?

awkрешение:

awk '{ if ($0 ~ /pattern/) {      # if it's a `pattern` line
         if ((getline nl) > 0) {  # check if next record exists
             # if next record hasn't number - insert `1000`, otherwise - print current and next records as they are
             print ((nl !~ /^[0-9]/)? $0 ORS 1000 ORS nl: $0 ORS nl)
         } else {
             print $0 ORS 1000   # if the file ends up with pattern - insert `1000`
         } 
       } else {
          print $0  # print other record
       }
    }' file

Выход:

pattern.d
17.91
17.55
pattern.b
1000
pattern.a
7.21
9.34
pattern.c
1000