Scribbles for my memory

其实很简单，但因为网上有流传很广的教程并不适用于最新的 ubuntu 20.04，造成我也走了一点弯路。 certbot-auto 官方已停止维护，但网上广为流传的教程仍然推荐使用 certbot-auto 来生成证书。这是问题的根源。正确的姿势是这样的

sudo apt install certbot
sudo certbot certonly --manual -d *.yourdomain.com -d youdomain.com --preferred-challenges dns-01 --server https://acme-v02.api.letsencrypt.org/directory

照提示一步一步来就好了。是不是超级简单？

I originally thought the later should be used. I was wrong.

这都是为了看《非正常人类异闻录》

iconv -c -f gbk -t utf-8 待转文件名 > target.txt

-c 的意思是在输出文本中忽略非法的字符序列

Reference

然而都弄好了，即没有认真看那本书。不喜欢那种风格，没办法

package name for common used Linux util in Debian/Ubuntu

ps

apt install -y procps

ping

apt install -y iputils-ping

telnet

apt install -y telnet

general solution for apt get/apt upgrade similiar issues

first,

sudo dpkg --configure -a

followed by:

sudo apt --fix-broken install

1. http_proxy environment in sudo command： http_proxy=xxx:xxx sudo yourcommand doesn't work, you should sudo http_proxy=xxx:yyy yourcommand instead.
2. ssh running local script: ssh username@hostname 'bash -s' < your.local.script.sh
3. ssh running local script with paraemters: ssh username@hostname < your.local.script.sh 'bash -s' yourparam1 yourparam2 doesn't work, you should runssh username@hostname < your.local.script.sh 'bash -s' -- yourparam1 yourparam2
4. make your fonts configuration work without a reboot: sudo fc-cache -fv