The simplest key-value db written in shell

shdb.sh

#!/bin/bash

# Usage
# > ./shdb.sh db_set foo 3
# > ./shdb.sh db_set bar 5
# > ./shdb.sh db_get foo
# 3

db_set() {
  echo "$1,$2" >> database
}

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

"$@"