shell advanced techniques - Redirection

The following list is supported Shell redirection operator.

Operators	Features
<	Redirect input
>	Redirecting output
>>	Additional output
2>	Redirect error
&>	Redirect output and errors
>&	Redirect output and errors
2>&1	Redirected to the standard error output
1>&2	Redirecting standard output to the error
>|	When redirecting output options covering noclobber

    #find命令将搜索结果输出到foundit文件，把错误信息输出到/dev/null
    [root@xieqichao ~]# find . -name "*.c" -print > foundit 2> /dev/null
    #将find命令的搜索结果和错误信息均输出到foundit文件中。
    [root@xieqichao ~]# find . -name "*.c" -print >& foundit
    #同上。
    [root@xieqichao ~]# find . -name "*.c" -print > foundit 2>&1
    #echo命令先将错误输出到errfile，再把信息发送到标准错误，该信息标准错误与标准输出合并在一起(errfile中)。
    [root@xieqichao ~]# echo "File needs an argument" 2> errfile 1>&2
    [root@xieqichao ~]# cat errfile
    File needs an argument