linux < >difference

##Difference:

> Overwrite output to text (Recommended learning: linuxOperation and Maintenance)

< Use the following file as the input of the previous command

Okay, let’s experiment first, first create a The test.txt file is empty, and then we use the cat command to do this experiment

touch test.txt

Let’s try cat < a The following error will appear, indicating that this is followed by a file or directory

[root@oracle1 test]# cat < a
bash: a: No such file or directory

So what can be in the file? First write aaa into test.txt and then execute cat < test.txt. It seems to be no different from directly cat test.txt

[root@oracle1 test]# cat > test.txt 
aaa
^C
[root@oracle1 test]# cat test.txt 
aaa
[root@oracle1 test]# cat < test.txt 
aaa

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