Programming VIP

catalogue Shell operator Arithmetic operator Boolean operator Logical operator String operator File test operator echo print data test command number character string File test Shell process control if case for while break continue Shell function Shell operator Arithmetic operator #! /bin/bash a=20 b=10 val=`expr $a ...

Signal capture trap, which captures a specified signal and executes predefined commands. For example, pressing Ctrl+C will terminate the execution of the script. In fact, the system sends a SIGINT signal to the script process. The default way to process the SIGINT signal is to exit the program. If you want to not quit the program at Ctrl ...

Overview of function variables Variable scope: the scope of Shell variables is the effective scope of Shell variables Variable type Common variables are also called global variables. The scope of common variables is the current shell script program file, including the functions in the script. Environment variables: the current shell ...

1. Initial Linux shell Linux kernel System memory managementSoftware program managementHardware device management: character type, block, network device fileFile system management GNU tools: coreutils packageGraphical desktop environment: X Window, KDE, GNOME, UnityApplication software 2. Enter the shell Set terminal color setterm -for ...

Advanced shell script 1. ubuntu network configuration (61 minutes) 2. shell script programming purchase price while loop and control (46 minutes) 3. shell script advanced shift and select(49 minutes) 4. shell script advanced function implementation (57 minutes) 5. shell script advanced function recursion and signal capture (61 minutes) 6. shell ...

Authority management Permission viewing and reading Permission view ls -l file #View file permissions ls -ld dir #View directory permissions | rw-r–r-- | . | 1 | root | root | 0 | Apr 12 10:57 | westos [1] [2] [3] [4] [5] [6] [7] [8] [9] [1] # file type #-Ordinary file #d directory #l soft connection #b. fast equipment #c char ...

preface We will show you a go zero micro service example in detail through a series of articles. The whole series is divided into ten articles, and the directory structure is as follows: Environment construction Service splitting User services Product service Order service Payment services RPC service Auth authentication Serv ...

xdm! I'm back! Fight the undead cockroach, fight the undead Li Qiang Compliance baseline Host security compliance check This article contains 16 common safety compliance checks! Xiao Li said: Search and replace files Syntax: sed option's / search content / replace content / action 'file Where s: represents search/ Separator (can be cus ...

preface We will show you a go zero micro service example in detail through a series of articles. The whole series is divided into ten articles, and the directory structure is as follows: Environment construction Service splitting User services Product service Order service Payment services (this article) RPC service Auth authen ...

Image command 1. List all local images docker images docker image ls 2. Label the local image docker tag [image_name]:[tag] [new_image_name]:[new_tag] 3. View image details docker inspect [image_name]:[tag] 4. View the image history # Display the specific content of each layer docker history [image_name]:[tag] 5. Search image # ...