Linux standard input and output redirection

Background: screen printing is not always from the standard output, but also includes the information in the standard error output stream stderr
File descriptor Definition (12 system defined)
0 standard input 1 standard output 2 standard error 0 default keyboard input by default printing from the screen, you can redirect to another file reference: stream, pipeline redirection [IBM]: Http://www.ibm.com/developerworks/cn/linux /l-lpic1-v3-103-4/redirect Execution order: Http://blog.chinaunix.net/uid-25324849-id-3141027.html Redirect and pipeline:/http man.chinaunix.net/linux/mandrake/101/zh_cn/command-line.html/shell-pipes.html input/Output redirection in detail:/http Blog.chinaunix.net/uid-9478057-id-2002343.html

Linux standard input and output redirection