MySQL DELETE TRUNCATE drop 相同点: 1.truncate和不带where子句的delete、以及drop都会删除表内的数据。 2.drop、truncate都是D

DecimalFormat 我们经常要将数字进行格式化，比如取2位小数，这是最常见的。Java 提供 DecimalFormat类，帮你用最快的速度将数字格式化为你需要的

霍桑效应 20 年代时，在芝加哥郊外一个名为"霍桑"的工厂里，研究人员在研究照明条件对工人绩效表现的影响。研究人员最初认为，随

‘ansible 管理工作站配置, linux初始化’ 1 2 # archlinux 直接从仓库里安装就是最新版本 sudo pacman -S git ansible ubuntu,debian ubuntu 默认 apt 安装的ansible版本可能是旧版本

SSL 故障分析 1 2 3 4 5 6 7 8 openssl s_client -connect host0:port0 2>&1 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' openssl verify foo.pem openssl s_client -connect host0:port0 -state -showcerts 解码根证书 openssl x509 -text -in roch.pem https://www.ibm.com/developerworks/cn/linux/l-cn-sclient/index.html

clonezill download clonezill iso from https://clonezilla.org/downloads.php install balenaEtcher 1 dd bs=1M conv=fdatasync if=./clonezilla-live-3.2.0-5-amd64.iso of=/dev/sdx 1 2 3 4 5 6 7 8 9 start clonezilla device-image nfs_server dhcp nfs4 192.168.50.227 /backup_xxxx/ beginner save parts clonezill https://clonezilla.org/ https://clonezilla.org/liveusb.php#macos-setup Download the Clonezilla Live iso file. Insert a USB flash drive on the Mac machine. Erase it using the standard Mac Disk Utility (exFAT works fine). Download balenaEtcher for macOS, then follow its

diffie-hellman 1 openssl dhparam -out dhparam.pem 2048 # 如果你的机器性能足够强大,可以用 4096 位加密

idea 快捷键, keymap alt + shift + up, move line up Key Command ctrl+g line/column ctrl+t Class… ctrl+] move caret to code block end ctrl+alt=b Go to Implementation(s), 接口的实现类

无障碍设计规范,GB50763—2012 2012年9月1日,住房和城乡建设部、国家质检总局联合发布的修订后的《无障碍设计规范》 (GB50763-2012) 国家标准正式

MySQL dml DML 1 2 3 iNSERT INTO table_name ( field1, field2,...fieldN ) VALUES ( value1, value2,...valueN ); https://blog.51cto.com/lustlost/1224775

google authenticator databases https://eduncan911.com/technology/hardware/google-authenticator-databases-move-copy-fix.html /data/data/com.google.android.apps.authenticator2/databases/databases

google domain, invalid City 填写联系人资料的时候国家选择中国,填写城市 的时候要写成 Dalian Shi Google Domain 填写出错 http://www.flaskfox.com/2015/11/16/google-domain-%e5%a1%ab%e5%86%99%e5%87%ba%e9%94%99/embed/#?secret=2UAujlnd36

java data convert NumberFormat formatter = new DecimalFormat("#0.00”); System.out.println(formatter.format(4.0));

intellij idea 配置git ssh key 把私钥放入目录 C:\Users\user0\.ssh, 私钥不需要转换成 ppk 格式. https://blog.csdn.net/u010348570/article/details/81204371 1 安装git,登录官网https://www.git-scm.com/downl

archlinux ip forward, ip_forward 开启数据包转发 1 2 3 4 5 vim /etc/sysctl.d/30-ipforward.conf net.ipv4.ip_forward=1 net.ipv6.conf.default.forwarding=1 net.ipv6.conf.all.forwarding=1 1 sysctl -a |grep net.ipv4.ip_forward 配置 nftables 的转发规则 nftables 默认在 forward 链抛掉所有数据。 如果启用了 nftables, 一定修改一下 nftables 的默认配置文件。否则

diff command diff 的三种格式 正常格式 上下文格式 合并格式 git 格式 Git’s diff is a variant of unified diff, so unified diff is preferred. 1 2 # unified diff diff -u foo bar diff 是 Unix 系统的一个很重要的工具程序。它用来比较两个

redis config redis 配置 sample, 单机 redis server 配置 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

nodejs basic version current v14.21.3 latest v21.6.2 nvm, Node Version Manager https://github.com/nvm-sh/nvm 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 # macos install nvm brew install nvm # ubuntu 24.04 install nvm curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.3/install.sh | bash # archlinux install nvm pacman -S nvm # Due to the way nvm is designed, you have to source it before

kde config, kde 配置 显示器亮度问题 通过 dbus 设置亮度 1 2 3 4 5 dbus-send --session --print-reply \ --dest=org.kde.Solid.PowerManagement \ /org/kde/Solid/PowerManagement/Actions/BrightnessControl \ org.kde.Solid.PowerManagement.Actions.BrightnessControl.setBrightness \ int32:6000 kde idea 图标消失 Open folder /home/USERNAME/.local/share/applications/ Find jetbrains-idea.desktop Right mouse click on it, then select Properties Open Application tab Next to the Command section click Browse… button and select idea.sh file in

idea install default plugins build tool ant - disable maven gradle version control cvs - disable mercurial - disable git subversion github test tools junit testng-j - disable swing - disable android - disable othre tools plugin development - disable