How to count lines in a file on hdfs command?

Question

I have a file on HDFS that I want to know how many lines are. (testfile)

In linux, I can do:

wc -l 

Can I do somet

Answer 1

You cannot do it with a hadoop fs command. Either you have to write a mapreduce code with the logic explained in this post or this pig script would help.

A = LOAD 'file' using PigStorage() as(...);
B = group A all;
cnt = foreach B generate COUNT(A);

Makesure you have the correct extension for your snappy file so that pig could detect and read it.