Apache Pig Utility命令提供了两种类似的命令类型，分别是run和exec，以便在grunt shell上执行pig脚本。为了不接受任何其他输入，我的问题是针对用例，在这种情况下使用run over exec命令确实很有用。
浏览apache pig文档-http://pig.apache.org/docs/r0.17.0/cmds.html#run，其中提供了有关这两个命令的非常详细的信息
grunt> cat myscript.pig
b = ORDER a BY name;
c = LIMIT b 10;
grunt> a = LOAD 'student' AS (name, age, gpa);
grunt> run myscript.pig
grunt> d = LIMIT c 3;
grunt> DUMP d;
(alice,20,2.47)
(alice,27,1.95)
(alice,36,2.27)
grunt> cat myscript.pig
a = LOAD 'student' AS (name, age, gpa);
b = LIMIT a 3;
DUMP b;
grunt> exec myscript.pig
(alice,20,2.47)
(luke,18,4.00)
(holly,24,3.27)