nohup command 2> & 1 & meanings:
nohup: no hang up, meaning not hang up. Permanent represents the execution order, even if the current terminal has Log.
&: Background execute the command.
2>&1：
In the bash shell,
0 represents the standard input, keyboard input is generally;
1 represents the standard output, typically a screen;
2 represents standard error;
When therefore command nohup & run, the standard errors are output to 2 to go, console not seen the error output.
Therefore, 2> & 1 redirects all played a role, the standard error is redirected to standard output up, running in the background you can see the output of the error in the program on the screen.
eg. nohup bin/hive --service hiveserver2 2>&1 &