root@u1:/home/sa/hod/hadoop-0.20.1# bin/hadoop fs -put ./conf/core-site.xml  /input

root@u1:/home/sa/hod/hadoop-0.20.1# bin/hadoop jar hadoop-*-examples.jar wordcount /input /output2

root@u1:/home/sa/hod/hadoop-0.20.1# bin/hadoop jar hadoop-*-examples.jar

An example program must be given as the first argument.

Valid program names are:

  aggregatewordcount: An Aggregate based map/reduce program that counts the words in the input files.

  aggregatewordhist: An Aggregate based map/reduce program that computes the histogram of the words in the input files.

  dbcount: An example job that count the pageview counts from a database.

  grep: A map/reduce program that counts the matches of a regex in the input.

  join: A job that effects a join over sorted, equally partitioned datasets

  multifilewc: A job that counts words from several files.

  pentomino: A map/reduce tile laying program to find solutions to pentomino problems.

  pi: A map/reduce program that estimates Pi using monte-carlo method.

  randomtextwriter: A map/reduce program that writes 10GB of random textual data per node.

  randomwriter: A map/reduce program that writes 10GB of random data per node.

  secondarysort: An example defining a secondary sort to the reduce.

  sleep: A job that sleeps at each map and reduce task.

  sort: A map/reduce program that sorts the data written by the random writer.

  sudoku: A sudoku solver.

  teragen: Generate data for the terasort

  terasort: Run the terasort

  teravalidate: Checking results of terasort

  wordcount: A map/reduce program that counts the words in the input files.

hadoop jar hadoop-0.20.2-examples.jar wordcount

Usage: wordcount <in> <out>