Birdhunt CFT challenge done in bash and then AWK. Find the coordinates for the birds in the grid and finish all 200 rounds before the timeout.

birdawk.sh

#!/bin/bash

inround=false
exec 5<>/dev/tcp/35.231.207.196/15830
while true; do
  if $inround; then
    awk 'BEGIN {coords=""} /B|^$/ {
      if(NF == 0)
        exit
      for(i=2;i<=NF;i++) {
        if($i == "B")
          coords = coords";("i-2","$1")"
      }
    } END {print substr(coords,2)}' <&5 >&5 && inround=false || echo huh
  else
    read row line <&5 || break
    (( round == 200 )) && echo "$row $line" | grep flag && exit 0
    [[ "$row" == "Round:" ]] && inround=true && round=$line
  fi
done
echo "Got to round: $round"
exit 1

birdhunt.sh

#!/bin/bash

start=false
coords=
exec 5<>/dev/tcp/35.231.207.196/15830
while read row line; do
# Loop through quickly to find the start of the first round
  if ! $start; then
    [[ "$row" == "Round:" ]] && start=true && round=$line
    continue
  fi

# Find the right time to submit the coordinates
  [[ -z "$row" && ! -z "$coords" ]] && echo ${coords:1} >&5 && coords= && continue

# Check for which column the B is in
  [[ "$line" == *"B"* ]] && column=0 && for line2 in $line; do
    [[ $line2 == "B" ]] && coords="$coords;($column,$row)"
    column=$(( column + 1))
  done <<< "$line" && continue
  [[ "$row" == "Round:" ]] && round=$line && continue
  (( round == 200 )) && echo "$row $line" | grep flag && exit 0
done <&5
echo "Got to round: $round"
exit 1