On the host machine where Pig is installed, run the following commands:

su - $HDFS_USER hdfs dfs -copyFromLocal /etc/passwd passwd

Create a Pig script file named /tmp/id.pig that contains the following Pig Latin commands:

A = load 'passwd' using PigStorage(':');B = foreach A generate $0 as id; store B into '/tmp/id.out';

Run the Pig script:

su - $HDFS_USER
pig -l /tmp/pig.log /tmp/id.pig