KeyValueStores

event_app.sh

#!/bin/bash                                                                                                                           

# storage functions
db_set () {
  echo "$1,$2" >> event_store
}

db_get () {
  grep "^$1," event_store | sed -e "s/^$1,//" | tail -n 1
}

# main flow
db_set name luise
db_set age 32
db_set name anna
db_get name
db_get age

state_app.sh

#!/bin/bash                                                                                                                           

# storage functions
db_set () {
  [[ $(grep "^$1," state_store) ]] && sed -i '' -e "s/^$1,.*/$1,$2/" state_store || echo $1,$2 >> state_store
}

db_get () {
  grep "^$1," state_store | sed -e "s/^$1,//"
}

# main flow
db_set name luise
db_set age 32
db_set name anna
db_get name
db_get age