A.Redis Installation

1.set root password:

    $sudo passwd
    input the password already changed and get the root authority:
    $su 

2.select the redis version:

    for example:version-2.8.9 for Redis version-2.4.2 for Jedis(redis for java) 

3.get into thr root directory and download the redisJar:

    $cd
    $wget http://labfile.oss.aliyuncs.com/files0422/redis-2.8.9.tar.gz

4.unzip the redisJar:

    $tar -xzvf redis-2.8.9.tar.gz

5.move into the new directory redis-2.8.9 and compile it:

    $cd redis-2.8.9
    $make

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