date command 输出指定时区的时间 shell 支持在 date 命令前，指定 TZ 参数，即指定时区，这样 dat e输出将会输出指定时区的时间。TZ 是 timezone 的缩写。 1 TZ=0 date date 打印的日期格式 默

linux seq seq命令用于产生从某个数到另外一个数之间的所有整数。 seq [选项]… 尾数 seq [选项]… 首数 尾数 seq [选项]&hel

keepassxc win10 install win32 openssh https://github.com/PowerShell/Win32-OpenSSH/wiki/Install-Win32-OpenSSH download and install openssh, OpenSSH-Win64.zip https://github.com/PowerShell/Win32-OpenSSH/releases/ install powershell.exe -ExecutionPolicy Bypass -File install-sshd.ps1 New-NetFirewallRule -Name sshd -DisplayName ‘OpenSSH Server (sshd)’ -Enabled True -Direction Inbound -Protocol TCP -Action Allow -LocalPort 22 net start sshd Set-Service sshd -StartupType Automatic https://github.com/rupor-github/wsl-ssh-agent https://github.com/jstarks/npiperelay https://blog.wiloon.com/?p=13028&embed=true#?secret=RVVrbehtY9 https://keepassxc.org/

算法效率, 算法分析 https://blog.csdn.net/zolalad/article/details/11848739 https://www.zhihu.com/question/21387264 算法的时间复杂度和空间复杂度 通常,对于一个给定的算法,我们要做两项分析。第一是从数学上证明算法的正确性,这一步主要用到

温度监控, lm-sensors, temperature 不用安装其它软件的方法 1 2 3 cat /sys/class/thermal/thermal_zone0/temp echo $[$(cat /sys/class/thermal/thermal_zone0/temp)/1000]°

elasticsearch 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 #查看索引 GET /_cat/indices?pretty curl -X GET "localhost:9200/_cat/indices?v" GET /index-2018.09.29/_stats GET /_cat/indices?pretty # elasticsearch 重启后用以下命令观察集群状态。 watch -n 1 -d curl -XGET http://localhost:9200/_cluster/health\?pretty curl -X GET "localhost:9200/_cluster/allocation/explain?pretty" -H 'Content-Type: application/json' -d' { "index": "myindex", "shard":

archlinux kde, config 1 2 3 4 5 6 7 8 9 10 11 12 sudo pacman -S xorg xorg-xinit sudo pacman -S plasma-desktop echo "exec startplasma-x11" > ~/.xinitrc sudo pacman -S konsole dolphin kate startx sudo pacman -S sddm sudo pacman -S breeze-gtk breeze kde-gtk-config sudo pacman -S kdeplasma-addons sudo pacman -S kwalletmanager # start kwalletmanager and disactive kwallet 登录后启动kde 1 2

X11 forwarding https://wiki.archlinux.org/title/OpenSSH 1 2 3 4 5 6 7 8 9 10 11 12 pacman -S xorg-xauth xorg-xhost /etc/ssh/sshd_config X11Forwarding yes AllowTcpForwarding yes X11UseLocalhost yes X11DisplayOffset 10 systemctl restart sshd pacman -S xorg-xclock https://gist.github.com/vietlq/8b20d09fdfe5f02f8b511c7847df39ee win 10 xserver, x11forward Install VcXsrv Windows X Server Download and install: https://sourceforge.net/projects/vcxsrv/ Check that VcXsrv runs and right-click, get logs to find DISPLAY=127.0.0.1:0.0 Note down the value of $DISPLAY and pass it ot PuTTY Configure PuTTY Navigate to SSH => X11 => Tick Enable X11 forwarding Pass the value of $DISPLAY (which is 127.

rancher https://rancher.com/docs/rancher/v2.6/en/ RKE: Rancher Kubernetes Engine EKS: Amazon EKS (Elastic Kubernetes Service) GKE: Google Kubernetes Engine https://github.com/rancher/rancher https://helm.sh/ https://k3s.io/ k3s k3s 将安装 Kubernetes 所需的一切打包进仅有 XXMB 大小的二进制文件中。并且，为了减少运行 k8s 所需的内存，删除了很多不必要

Remote IP Valve, X-Forwarded-For等http头字段 http://www.10tiao.com/html/308/201702/2650076434/1.html http://tomcat.apache.org/tomcat-8.0-doc/api/org/apache/catalina/valves/RemoteIpValve.html X-Forwarded-For等http头字段与Tomcat的 Remote IP Valve (Valve源码

‘Linux oom killer’ https://blog.csdn.net/GugeMichael/article/details/24017515 Linux - 内存控制之oom killer机制及代码分析 2014年04月18日 15:04:29 阅读数: 28048 最近,线上一些内存占用比较敏感的应用,在访问峰值的时

java onerror http://hllvm.group.iteye.com/group/topic/40211 -XX:OnError="jstack -F %p >/opt/com/test/threaddump.log”

Java诊断工具 - btrace https://github.com/btraceio/btrace/releases 打印慢调用 创建一个java类 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 // MethodDuration_redis.java import com.sun.btrace.annotations.*; import static com.sun.btrace.BTraceUtils.*; import java.util.Date; @BTrace public class MethodDuration_redis{ private static int i=0; @OnMethod(clazz = "com.wiloon.package0.Class0",method = "method0",location=@Location(Kind.RETURN)) public static void printMethodRunTime(@ProbeClassName String

Java Flight Recorder, jfr 1 2 3 4 5 6 7 8 9 jcmd 40019 VM.check_commercial_features jcmd 40019 VM.unlock_commercial_features jcmd 40019 JFR.check jcmd 40019 JFR.start name=jfr0 delay=10s duration=10s filename=jfr0.jfr

kafka, rabbitmq http://www.infoq.com/cn/articles/kafka-vs-rabbitmq?utm_campaign=infoq_content&utm_source=infoq&utm_medium=feed&utm_term=global

SSH 密钥类型 RSA, DSA, ecdsa, ed25519 rsa ecdsa ed25519 ed25519 是目前最安全、加解密速度最快的 key 类型, 优先选择 ed25519 rsa 兼容性最好, 小于 1024 位密钥长度的 RSA 已经有被攻破的记录, 建议长度 2048, 3072

chrome os recover https://support.google.com/chromebook/answer/1080595?hl=zh-Hans open chrome and install Chromebook Recovery Utility 第 3 步: 进入恢复模式 在出现错误的 Chromebook 上: 如果您在这台 Chromebook 上连接了任何设备 (例如鼠标或外部硬盘) ,请将其取下。 进入恢复模式:

‘chromeos linux, crostini’ 1 2 3 4 5 vmc start dev run_container.sh -container_name=stretch -user=wiloon -shell switch to dev channel, chrome os version >=67 chrome os will start to download an update update and restart Launch crosh (ctrl-alt-t) Create crostini VM vmc start dev. This’ll download the termina component, and open a shell. Launch a container run_container.sh -container_name=stretch -user=wiloon -shell https://www.youtube.com/watch?v=s9mrR2tqVbQ Crostini 101 from Crostini https://github.com/lstoll/cros-crostini/blob/master/README.md https://support.google.com/chromebook/answer/1086915?hl=en

eval command 语法: eval cmdLine eval 会对后面的 cmdLine 进行两遍扫描, 如果第一遍扫描后, cmdLine 是个普通命令, 则执行此命令；如果 cmdLine 中含有变量的间接引用, 则保证间接引用的语义。

mbr, gpt http://www.cnblogs.com/zhaojiedi1992/p/zhaojiedi_linux_039_fdisk_gdisk_parted.html 两种分区结构简介 MBR分区 硬盘主引导记录MBR由4个部分组成 主引导程序 (偏移地址0000H-0088H) ,它负责从活动分区中装载,并运