Note redirect data flow linux

It refers to redirect data flow according to the command output is not printed on the screen, but is directly input to another device such as a printer or a file or hopper

commands command [option] Parameters> | >> | 1> | 2 > | 2 >> File or printing device

> redirect output to indicate there such as ls /tmp/man.config> /tmp/out.txt ls output, but the results should have been used on the screen> output information to know if the file out.txt out. txt file will be automatically created does not exist

>> and> >> but if you use the same meaning if out.txt existing content output to out.txt speaking to accumulate after out.txt

command execution error message if the 2> is the only output both have the correct error message can be output with 2> remapped to other files

, such as find -name / home / test> /tmp/out.txt 2> /tmp/error.txt correct information to the / tmp / out .txt error information is output to the error.txt

<meant to represent files imported from other files, such as cat> text.txt will wait for your input after finished pressing CTRL + d in text.txt automatically imported. If we cat> text.txt <somtext.txt test.txt will be introduced into the right sometext.txt 

<< eof indicates the end of input means such as CTRL + d may alternatively cat> text.txt << eof the input data has been input eof to complete.