jiahut

centos

yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

yum install -y ansible

ubuntu

apt update && apt install software-properties-common dirmngr -y

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user groups basic

groups

usermod -a -G wheel admin

https://superuser.com/questions/547966/whats-the-difference-between-adduser-and-useradd

ls -l $(which adduser)

jiahut

say -v ? say -v Alex 'I love this game'

jiahut

docker

docker run --name aria -d -p 6800:6800 -p 80:80 -v /mnt/sg/aria2_data:/data jiahut/aria2-ui:1

tools on debian

apt install net-tools -y

aria2 docker

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#!/bin/bash

set -o errexit # set -e
set -o pipefail

# https://superuser.com/questions/100288/how-can-i-check-the-integrity-of-a-video-file-avi-mpeg-mp4

OPTIONS=dio:v
LONGOPTS=debug,info,output:,verbose

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statistics

https://unix.stackexchange.com/questions/18506/recursive-statistics-on-file-types-in-directory

find . -type f | sed 's/.*\.//' | sort | uniq -c

find . -type f| ruby -ne 'puts $1 if $_ =~ /.*\.(\S+)/ ' | sort | uniq -c

jiahut

regex

https://rubular.com/ https://stackoverflow.com/questions/6673847/what-are-rubys-numbered-global-variables https://www.jianshu.com/p/974dee8953e6

$` and $' : before $& after match

cat <<- EOF | ruby -ne ' puts $& if $_ =~ /

.*?</div>/ ' a1

test1

b1

test2

c1

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file with blank

https://askubuntu.com/questions/343727/filenames-with-spaces-breaking-for-loop-find-command

touch '1 2.sss' && echo '1 2.sss' > '1 2.sss'
touch '2 1.sss'
touch 1 && echo 1 > 1
touch 2 && echo 2 > 2

find . -name '*.sss' | while read file; do file "$file" ; done

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demo the begin-end block

https://stackoverflow.com/questions/14050296/what-does-rubys-begin-do

cat ruby-begin-end-block.md | grep -v -E '`|^#' | bash -xe

curl -s https://gist.githubusercontent.com/jiahut/25d90714eb9f9181af36559ec4148f51/raw/ | grep -v -E '`|^#' | bash -xe

cat <<-EOF | ruby 
 END { puts 'END block' }

jiahut

#!/usr/bin/env ruby

abort("please spectify a word") unless word = ARGV[0]
puts `curl -s 'http://dict-co.iciba.com/api/dictionary.php?key=79085A8D69548E2DC4CBEC053A8124FC&type=json&w=#{word}' | jq  -r '.symbols[]?.parts[]?.means[]?'`