RiverDB the simplest and smallest db of all

riverdb

#!/bin/bash

cmd=$1
key=$2
value=$3
file=db.data

if [[ "$cmd" = "" ]]; then
  echo "Invalid command";
  exit 1;
fi

if [[ "$key" = "" ]] || [[ "$key" = *":"* ]] ; then
  echo "Invalid key. Key cannot be empty or have such characters: ':'";
  exit 1;
fi

if [[ "$cmd" = "get" ]]; then
  # Using tac and sed GNU Commands in OSX 
  gtac $file | gsed -r -n 0,/^$key:\(.+\)/s/^$key:\(.+\)/\\1/p
  exit 0;
fi

if [[ "$cmd" = "set" ]]; then
  echo "$key:$value" >> $file
  exit 0;
fi

## Used for testing purposes
if [[ "$cmd" = "fill" ]]; then
  n=0
  while [[ $n -lt $2 ]]; do
    key=`gdate +%s%N | md5`
    ./river set ${key:0:8} pre_value_`gdate +%s%N | md5`_pos_value
    n=$(($n+1))
  done
fi

riverdb-usage

$ riverdb set foo bar
$ riverdb get foo
bar