avto
avto
avto
moto
moto
avia

avto    1
avto    2
avto    3
moto   1
moto   2
avia    1

=ЕСЛИ(A1=A2;B1+1;1)

#!bin/bash
a='avto'
i=1
while read line
do
  if [ $line = $a ]
  then
  echo $line | sed s/$/,$i/ >> result.csv
  i=$(($i+1))
  a=$(echo $line)
  else
  i=1
  echo $line | sed s/$/,$i/ >> result.csv
  i=$(($i+1))
  a=$(echo $line)
  fi
done < file.txt