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pig是什么？
我的理解是： pig就相当于 shell , hadoop就相当于linux (所以我尽可能的会使用pig操作hadoop的文件)
1.进入HADOOP_HOME目录。
2.执行sh bin/hadoop
我们可以看到更多命令的说明信息：
Usage: hadoop [--config confdir] COMMAND
where COMMAND is one of:
namenode -format format the DFS filesystem
secondarynamenode run the DFS secondary namenode
namenode run the DFS namenode
datanode run a DFS datanode
dfsadmin run a DFS admin client
fsck run a DFS filesystem checking utility
fs run a generic filesystem user client
balancer run a cluster balancing utility
jobtracker run the MapReduce job Tracker node
pipes run a Pipes job
tasktracker run a MapReduce task Tracker node
job manipulate MapReduce jobs
queue get information regarding JobQueues
version print the version
jar run a jar file
distcp copy file or directories recursively
archive -archiveName NAME * create a hadoop archive
daemonlog get/set the log level for each daemon
or
CLASSNAME run the class named CLASSNAME
Most commands print help when invoked w/o parameters.
常用pig命令
ls/ pwd/ cd
例如： 查看文件大小
grunt> fs -du -h -s 文件名
19.4 G 文件名
grunt> help
Commands:
; - See the PigLatin manual for details: http://hadoop.apache.org/pig
File system commands:
fs - Equivalent to Hadoop dfs command: http://hadoop.apache.org/common/docs/current/hdfs_shell.html
Diagnostic commands:
describe [:: explain [-script ] [-out ] [-brief] [-dot|-xml] [-param =]
[-param_file ] [] - Show the execution plan to compute the alias or for entire script.
-script - Explain the entire script.
-out - Store the output into directory rather than print to stdout.
-brief - Don't expand nested plans (presenting a smaller graph for overview).
-dot - Generate the output in .dot format. Default is text format.
-xml - Generate the output in .xml format. Default is text format.
-param -param_file - See parameter substitution for details.
alias - Alias to explain.
dump - Compute the alias and writes the results to stdout.
Utility Commands:
exec [-param =param_value] [-param_file ]
