The contents of the screen output of the Linux command are redirected to the log file

Abstract: Syn good son source: Http://www.cnblogs.com/cssdongl reprint please indicate the source

Quick mark the details of this command, lest later use and forget

We all know that you can use echo to output content to a file, such as echo "Hello,word" >> temp.txt

So what do I do now to output the screen of Hadoop or Spark's command to a file? Very simple, the command is as follows

Hadoop jar *.jar $mrClass > Mr.log 2>&1

Note the above command *.jar and $mrclass are replaced with their own jar package name and class.

Note that the 2>&1 in the back is critical, essential, and without the content output of the Hadoop jar execution process cannot be seen in Mr.log

Explain 2>&1.

1 stands for standard output, 2 for standard error

Then the command followed by 2>&1 means that the standard error and standard output of the command execution are redirected to Mr.log.

The contents of the screen output of the Linux command are redirected to the log file