Linux Common Command Note two

wget Download, get the content on the network

grep File Search Tool

Everything is a file in the Linux system

Installing Cowsay

sudo apt-get install Cow-say

Cowsay Ctrl + D to end the input

StdOut output file pointer

The previous content in cat file1>file2 file2 is gone.

What's best file1 in cat file1>>file2 file2

It can also look like this: Cat is the one that connects two files

Cat file1 file2 >file3 this way, file1 file2 overlay into File3

Error message redirection : 2> is fine.
LS SSDSLFJ 2>file

Pipe Line |

Permissions issues

Ls-la This way, you can see the authority problem.

chmod +w. Permission issues can be changed

W Write permission Delete, rename

: Wq ZZ Save

X has execute permission to execute as a program

PS Aux|less This is the view process and pagination display

Shortcut keys in Ubuntu system
Ctrl + SHIFT + C copy
CTRL + SHIFT + V paste

CTRL + SHIFT + T opens a new window

aux is the process of production

Kill End Process

Location Lookup

Location--regexp Regular Expressions

UpdateDB updating the file system database

Locate XX

Find finds the current folder

Find. | grep. txt to find a. txt file, using pipe breaks
find. |-type f viewing files
Find. | -type D Viewing folders

rsync-r folder remote site upload file to server

Linux Common Command Note two