查看端口被哪个程序占用

sudo lsof -i tcp:port

看到进程的PID，可以将进程杀死。

sudo kill -9 PID

文件查找

locate nginx.conf
find . -name game

利用pwgen生成密码

pwgen

命令行插入代码至文件(mac)

-> sed -i '' '1i\
quote> hello
quote> ' hello.txt

ruby解析xml节点

require 'rexml/document'
include REXML
xmlstr = '<?xml version="1.0" encoding="utf-8"?>
<string xmlns="MUI">{"rList":[{"DormId":"G1276242854","DormName":"东湖公寓","RoomId":"","RoomAccountID":""},{"DormId":"G1290492858","DormName":"丰泽公寓","RoomId":"","RoomAccountID":""},{"DormId":"G1283531903","DormName":"金岸公寓","RoomId":"","RoomAccountID":""},{"DormId":"G1252577939","DormName":"芷兰公寓","RoomId":"","RoomAccountID":""}],"Status":"1","Message":"请求成功","rowCount":4}</string>'

xmldoc = Document.new(xmlstr)
 
# 获取 root 元素
root = xmldoc.root

result = JSON.parse(root.get_text.to_s)

ruby将Hash的key转为小写

hash.transform_keys!(&:downcase)

ls显示文件大小

ls -lh ~

scp 文件上传/下载

# upload
scp -P 8864 ./tmp/member.xls deployer@test-17pdf.kdan.cn:/var/www

# download
scp -P 2222 root@www.vpser.net:/root/lnmp0.4.tar.gz /home/lnmp0.4.tar.gz

wordpress .htaccess

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

VIM 强写

:w !sudo tee %

Rails4+ 不验证authenticity_token

skip_before_action :verify_authenticity_token

GitHub 空项目

# create a new repository on the command line
echo "# golang-book-practice" >> README.md
git init
git add README.md
git commit -m "first commit"
git remote add origin git@github.com:iiewad/golang-book-practice.git
git push -u origin master

#push an existing repository from the command line
git remote add origin git@github.com:iiewad/golang-book-practice.git
git push -u origin master

iewad

Terminal 代理

export http_proxy='http://localhost:8118'
export https_proxy='http://localhost:8118'

#取消代理

unset http_proxy
unset https_proxy

tmux备忘

tmux new -s session_name
tmux a -t session_name
tmux switch -t session_name

rvm gem install

rvm @global do gem install bundle
rvm rubygems current #update gems

gem install libv8 -v '3.16.14.13'  -- --with-system-v8

css文本溢出处理

单行：
overflow: hidden;
text-overflow:ellipsis;
white-space: nowrap;

多行：
display: -webkit-box;
-webkit-box-orient: vertical;
-webkit-line-clamp: 3;
overflow: hidden;

tar 解压缩

压缩
tar -czvf name-of-archive.tar.gz /path/to/directory-or-file
#解压
tar -xvzf name-of-archive.tar.gz

Postgres导入导出

postgresql 导出的数据库， 标准语句，

pg_dump –host [地址] –port [端口] –username [数据库的用户名] > [导出的文件] [数据库名字]

例子：

pg_dump --host xxxxx.com --port 3434 --username cs  > cs.sql cs

postgresql导入数据库， 标准语句：

psql -d [数据库名字] -f [文件名] [用户名]

例子：

psql -d cs  -f cs.sql cs

pdf to word

soffice --infilter="writer_pdf_import" --convert-to doc file.pdf