Out of memory error when installing Hadoop

1124880 pts.
Tags:
Big Data
Hadoop
I recently tried to install Hadoop following a document my friend gave me. When I tried to execute this:
bin/hadoop jar hadoop-examples-*.jar grep input output 'dfs[a-z.]+'
I got this exception:
java.lang.OutOfMemoryError: Java heap space
Has anyone seen this before? Like I said, I'm pretty new to Hadoop so any help I can get is greatly appreciated.
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