ps -ef |awk '{print $NF}'|sort |uniq -c |sort -nr |head -10


lsof -c java | wc -l


//关闭仪表盘
defaults write com.apple.dashboard mcx-disabled -boolean YES && killall Dock
//开启仪表盘
defaults write com.apple.dashboard mcx-disabled -boolean NO && killall Dock


//创建数据库
create database abc character set utf8;
//数据库授权
grant all on abc.* to 'abcuser'@'%' identified by '123456' with grant option;
//刷新信息
flush privileges;


//查看数据库字符设置
show variables like 'char%';
//设置数据库字符
set character_set_client=utf8;
set character_set_connection=utf8;
set character_set_database=utf8;
set character_set_results=utf8;
set character_set_server=utf8;
set character_set_system=utf8;


find . -type d -name ".svn" |xargs rm -rvf


nohup /bin/bash /etc/inotify_rsync.sh &


yum install -y mysql mysql-server mysql-devel


ps aux| head -1;ps aux | grep -v PID | sort -rn -k +3 | head


dscacheutil -flushcache


setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config


export LC_CTYPE=C && cat /dev/urandom | tr -dc A-Za-z0-9 | head -c 16;echo
openssl rand -base64 32 | tr A-Z a-z|cut -c 1-16
cat /dev/urandom tr -dc '12345!@#$%qwertQWERTasdfgASDFGzxcvbZXCVB' | head -c100; echo


g/^$/d


%s/^#.*$//g


flush tables with read lock;
unlock tables;


echo 1 >/proc/sys/vm/drop_caches
>>drop_caches的值可以是0-3之间的数字，代表不同的含义：
---0：不释放（系统默认值）
---1：释放页缓存
---2：释放dentries和inodes
---3：释放所有缓存


ssh-copy-id -i ~/.ssh/id_rsa.pub -p 12580 root@192.168.1.1


1.通过`ctrl +v`选中一个矩形块，将选中的地方插入要输入的东西。
2.`shift + i`后进入编辑模式，只有第一行被修改了，下面的并没有修改
3.按`esc`键两次,就可以将选中的块都修改了


hostnamectl set-hostname localhost


cat xxx.txt | grep -v '#' |grep -v '^$'
Last modification：May 15, 2022
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