[Linux] Basic web commands

Useful tip) always use "man" to find the options:

man <command>

 

Web Server

To connect to the internet from your computer, your browser needs to communicate to a web server over protocols like HTTP. 

 

How do we create web servers? - there are several methods:

python3 -m http.server [port] # python 3 server

# http web server with npm
npm install http-server
http-server -p [port]

# http web server with php
php -S [addr]

• Find more methods from this link: https://gist.github.com/willurd/5720255

 

Web Services 

 * we will talk about this topic in detail soon with different post.

 

CURL

• curl stands for "client for urls"
• it's a tool to control/test websites and transfer files over protocols like HTTP, HTTPS... 
  
  • apt is a newer version of "apt-get"
  • apt shows prettier/cleaner results
  • apt-get has more options
• unlike dpkg, apt downloads the dependencies needed to install a program - efficient!
• apt-cache <opt> <package>: shows version/information of package
  • apt-cache search <package>
  • apt-cache show <package>
• sudo apt install <package> -y : install package anyways as a root use

DPKG

• stands for "debian package manager"
• low-level packaging tool
• install deb.files, not their dependencies
• dpkg -i <-.deb>

Other CMDs

• wget : download from respositories
• pip: for python packages
• git: for git files

 

Backup and Restore

Which command does pop into your head when you should copy your file to other directory or a remote location?

Let's talk about three commands: cp, scp, rsync

• cp: copy files and directories
• scp: secure copy; copies files between hosts on a  network using ssh
  
  • secure than others (unless we use rsync --rsh=ssh)
    • -p: preserve modification
    • -r: recursively copy
• rsync: a fast, versatile, remote file-copying tool; used to backup 
  • faster & more optimized with delta-transfer algorithm (copy only missing parts)
  • enable interrupt handling 
    • -a: (archeive) preserve original file attributes
    • -v: (verbose) show progress
    • -z: (compress) enable compression