二人で笑って一人で泣いてゼロになって始まった！昨日に止まった空想なんてもういらない最高を奇妙を僥倖を嘲笑を熱情を今迎えに行くんだダッダッダッダッダーッダッダッダッダッダッダーッダッダッ”ウルトラトレーラー”さぁ、幕が上がるぜ──。山の向こうに空の向

cat/etc/mime.types请求报文：方法：URL：版本首部字段：值curl-vwww.jd.com响应报文：版本：状态码：短语首部字段：值curl-H"name:wang"www.dayu.com-v1xx:2xx:3xx:4xx:5xx:cat/

resetmaster;resetslaveall;半同步复制主主复制GTID[mysqld]read_onlysuper_read_onlyselect@@server_id;setglobalgeneral_log=ON;MHA+MycatPXCMGRTiDBmysqlslap-a

mysqldump--helpmysqldump-uroothellodb|gzip>/data/backup_mysql.sql.gzmysqldump-uroot-Bhellodb>/data/mysql_backup1.sqlmysqldump-uroot-A>/data/mysq

二叉树红黑树B-TreeB+Treeselect*fromstudentswherenamelike'Wang%';explainselect*fromstudentswherenamelike'Wang%';select@@profiling;setprofiling=o

showdatabases;SELECTversion();SELECTdatabase();selectuser,hostfrommysql.user;usemysql;showtables;helphelpcontents;showcharacterset;showcharset;show

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echo$BASHPIDpstreepstree-ppstree-Tpstree-upstree-H1070pspsauxps-efpsauxfpsaxouser,pid,cmd,nipsauxk%cpupsauxk%mempsauxk-%cpu|headprtstat80

opensslmd5/etc/passwdmd5sum/etc/passwdopensslsha512/etc/passwdsha512sum/etc/passwdopensslpasswd-6-saltLlWf/IWGEZYCYlXQ(umask077;opensslgenrsa-ou

systemdsystemctlis-activenginxsystemctlstatusnginxsystemctlstartnginxsystemctlstopnginxsystemctlenablenginxsystemctldisablenginxsystemctlenable--n

cat/etc/sysconfig/network-scripts/ifcfg-eth0cat/etc/netplan/01-netcfg.yamlcat/etc/default/grubgrub2-mkconfig-o/boot/grub2/grub.cfg#centos系列grub-m

十一种有限状态机closedsyn-sendsyn-recvestablefin-wait1fin-wait2time-wait......物理层数据链路层网络层传输层会话层表示层应用层三次握手四次挥手ARP(地址解析协议)ip

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[][[]]test(a=123;echo123)#（）会生成一个子shell{a=123;echo123;}#在当前shellreadvarread-p"pleaseinput:"nameread-sp"pleaseinuptpasswd:"passwdre

~]#sed-rn's/root/ROOT/p'passwd~]#sed-rn's/root/ROOT/gp'passwd~]#sed-rn'1,2p'passwd~]#sed-rn'1,5s/root/ROOT/gp'passwd~]#sed-rn'1,+3s/root/ROOT

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/etc/passwd/etc/shadow/etc/group/etc/gshadowchage-lwanguseradduseradd-Guseradd-guseradd-uuseradd-duseradd-suseradd-Museradd-cuseradd-ruseradd-D#

-文件b块设备文件c字符设备文件d目录文件l链接文件p管道文件ssocket套接字文件accesstime:访问时间modifytime：修改时间changetime：元属性时间cp

screen-ls查看会话screen-r重新连接已经断开的会话screen-x{序号}加入会话screen-S创建screen，指定名字echo$PS1echo-e'\e[032;1mtest\e[0m'-e启用反斜杠转义

前言Lambda表达式（LambdaExpression），相信大家对Lambda肯定是很熟悉的，毕竟我们数学上经常用到它，即λ。不过，感觉数学中的Lambda和编程语言中的Lambda表达式没啥关系