Ubuntu - command checklist

只是简单记录我使用的命令，没有什么参考价值，我只是用于整理

chown
chmod permissions filename
Where,

permissions can be read, write, execute or a combination of them.
filename is the name of the file for which the permissions need to change. This parameter can also be a list if files to change permissions in bulk

We can change permissions using two modes:

Symbolic mode: this method uses symbols like u, g, o to represent users, groups, and others. Permissions are represented as r, w, x for read write and execute, respectively. You can modify permissions using +, - and =.
Absolute mode: this method represents permissions as 3-digit octal numbers ranging from 0-7.

How to Change Permissions using Symbolic Mode

The table below summarize the user representation:

USER REPRESENTATION DESCRIPTION
u user/owner
g group
o other

We can use mathematical operators to add, remove, and assign permissions. The table below shows the summary:

OPERATOR DESCRIPTION
+ Adds a permission to a file or directory
– Removes the permission
= Sets the permission if not present before. Also overrides the permissions if set earlier.

Example:

Suppose, I have a script and I want to make it executable for owner of the file zaira.

Current file permissions are as follows:

Let's split the permissions like this:

USER REPRESENTATION	DESCRIPTION
u	user/owner
g	group
o	other

OPERATOR	DESCRIPTION
+	Adds a permission to a file or directory
–	Removes the permission
=	Sets the permission if not present before. Also overrides the permissions if set earlier.

df -H

The output of df -H will report how much space is used, available, percentage used, and the mount point of every disk attached to your system

Ubuntu 查看磁盘空间大小命令 - 水木清扬 - 博客园

Steps to Git clone on Ubuntu

git-clone@ubuntu:~$ sudo apt install git
git-clone@ubuntu:~$ git --version
git-clone@ubuntu:~$ git clone https://gitlab.com/cameronmcnz/gitlab-made-easy.git
git-clone@ubuntu:~$ cd my-github-repo
git-clone@ubuntu:~$ git config --global user.email "ubuntu-clone@example.com"
git-clone@ubuntu:~$ git config --global user.name "cameronmcnz"
git-clone@ubuntu:~$ touch my-file.html
git-clone@ubuntu:~$ git add .
git-clone@ubuntu:~$ git commit -m "good commit message"
git-clone@ubuntu:~$ git push origin master