Programmer Think

I use the following script to see if the file exists: #!/bin/bash FILE=$1 if [ -f $FILE ]; then echo "File $FILE exists." else echo "File $FILE does not exist." fi If I just want to check that the file does not exist, what is the correct syntax to use? #!/bin/bash FILE=$1 if [ $FILE does not exist ]; then echo "File ...

Get ready install vscode , you can download the deb package directly for installation, install the C/C++ for Visual Studio Code plug-in after completion, and restart after installation (no need to restart after the latest version 1.3). Generate directories and files Create a new folder [test] and a new file helloworld.cpp. The contents of the f ...

1. View the container image version of this version: kubeadm config images list The output is as follows: ~# kubeadm config images list k8s.gcr.io/kube-apiserver:v1.14.0 k8s.gcr.io/kube-controller-manager:v1.14.0 k8s.gcr.io/kube-scheduler:v1.14.0 k8s.gcr.io/kube-proxy:v1.14.0 k8s.gcr.io/pause:3.1 k8s.gcr.io/etcd:3.3.10 k8s.gcr.io/coredns:1.3.1 ...

It is really too pit, really want to Tucao about this operation system practice, each time is compile the kernel. The textbook was written in 2009, all the code before kernel 3.3. I record the system call experiment, hope you can avoid stepping on the pit. Method 1: kernel compilation Here I give you a link. This blog is wel ...

Process Management Control What is implemented here is a custom timer that counts the time a child process runs.The main ways of use are timer [-t seconds] command arguments For example, to count the run time of ls, you can enter timers directly, followed by arguments, which are the parameters of the program you want to run.For example: timer l ...

Recently, I have time to watch Go. I feel that the language of Go is really good. I'm Baidu. Let's talk about the algorithm today What is algorithm A series of calculation steps used to convert input data into output results The significance of the algorithm Used to solve specific problems The efficiency of different algorithms to ...

0x00 Regsvr32 introduction: The Regsvr32 command is used to register COM components. It is a command provided by Windows system to register or uninstall controls with the system, and runs in command line mode. Regsvr32.exe of WinXP and above system is under windows\system32 folder; regsvr32.exe of 2000 system is under winnt\sy ...

Ansible Common Modules Modules included in this section: (1) Timing task module cronvar (2) archive module (3) Unpacking module unarchive (4) Download module get_url (5) wait_for module (6) script module Timed Task Module cronvar In addition to the cron module itself, which can manage cron's environment variables, another module, cronvar, can ...

1. Sticky 1.1 sticking phenomenon Let's start by making a program that executes commands remotely based on tcp (commands ls-l; l l l l l; pwd) When multiple commands are executed at the same time, it is likely that only part of the result will be obtained, and when other commands are executed, another part of the result will be received, which ...

Welcome to the original link: https://mp.weixin.qq.com/s/eAJpnEfjflVr76iPVHN6rA  This is a personal note of sorting and thinking after watching the above links   Advantages of docker container More efficient use of system resources Because the container does not need additional overhead such as hardware virtualization and runni ...