Things I discover (Programming/Linux/Automation/Shell)

  • I learned about deploying django webapps using gunicorn and nginx. I was able to deploy full fledge application on raspberry pi.
  • I was able to configure NGINX and serve static files on the client side.
  • Learned about public and private IP addresses. most of the private IP addresses start with 192.XXX.XXX.XXX or 172.XXX.XXX.XXX
  • :%s/$/HelloWorld/ This command allows to add something end of the line(Note:This command saved me so much time when formating data.)
  • :%s!^!//! This vim command will add something in the beginning of the line.
  • I learned about created userforms in excel and mapping the userinputs to the excel macros
  • you can open python documentation using python3 -m pydoc -p <specify_port>

2021/1/25

  • xargs -n 1 curl -sL < urls.txt | grep -Eo "<title>.*</title>" This command allows you extract url titles when you have more than 1 url
  • curl -sL <url> | grep -Eo 'href="(https|http):[^\"]+"' This command allows you extract urls from a webpage.
  • use backticks to run a execute a command in bash script when the command is saved into a variable.
Example Script
filename="$1"
file="$1"
while read -r line; do
    name="$line"
    x=`curl -sL $name| grep -aEo "<title>.*</title>"` 
    echo "$x - $name"
done < "$filename"

2021/2/02

  • In order to delete a branch on git locally you can use git branch --delete <branchname> and if you want to do it remotely you can do git push --delete <branchname>

  • you can use ?* to match the rest of the characters when moving the files with mv command.

Lets say you have different files such as finance.jpg,fin-tech.jpg,fin-last.gif and you want to move all the files at once instead of moving each file one by one as each file has a different name and extension. You might do something like mv fin?* folder/ as all three files have same first three characters and rest can be anything so using this trick you can move all the files with different extensions at once.

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