update docs

docs/document/Nix/docs/2. Nix Cli Families/nix-channel.md

@@ -0,0 +1,31 @@
+# nix-channel
+
+## Add channel
+
+```bash
+nix-channel --add <url> [<channel_alias>]
+```
+
+:::info
+`channel_alias` is optional, defaults to `nixpkgs`
+:::
+
+## List channel
+
+```bash
+nix-channel --list
+```
+
+## Remove channel
+
+```bash
+nix-channel --remove <channel_alias>
+```
+
+## Update channel
+
+You'll need to fetch channel info after adding new channels
+
+```bash
+nix-channel --update [<...channel_alias>] # update all or specific channels
+```

docs/document/Nix/docs/Home Manager/2. Initialize home-manager Config.md

@@ -12,7 +12,7 @@ echo 'experimental-features = nix-command flakes' >> ~/.config/nix/nix.conf
 or the following for multi-users:
 
 ```bash
-echo 'experimental-features = nix-command flakes' >> /etc/nix/nix.conf
+sudo sh -c 'echo "experimental-features = nix-command flakes" >> /etc/nix/nix.conf'
 ```
 
 ## Initialize home-manager
@@ -48,4 +48,12 @@ home-manager switch
 
 This command uses `home.nix` and `flake.nix` under `~/.config/home-manager/` by default.
 
+If you feel uncertain, try
+
+```bash
+home-manager build
+```
+
+This generates a folder named `result/` under `~/.config/home-manager/`
+
 Currently we just tested the minimal config generated by home-manager, next we'll learn everything home-manager can do.

docs/document/Nix/docs/Home Manager/Add Packages.md

@@ -22,6 +22,7 @@ There's two ways to install packages using home-manager.
 ```
 
 **However, you won't be able to config the package in a same place.**
+To generate any file as well as config file, use `home.file."<file_path>"`
 
 ```nix
 { cofig, pkgs, ... }: {
@@ -34,3 +35,24 @@ There's two ways to install packages using home-manager.
   };
 }
 ```
+
+## Install and config by builtin option
+
+**For some packages, nix provides builtin options to set them up programmatically**
+
+```nix
+{ cofig, pkgs, ... }: {
+  programs.git = {
+    enable = true;
+    userName = "foo";
+    userEmail = "[email protected]";
+  };
+}
+```
+
+*`enable` implies that the package will be installed implicitly.*
+
+:::info
+Only few packages has builtin options, how do I know?
+Go to [Home-manager Options](https://nix-community.github.io/home-manager/options.xhtml) and search `programs.<pkg_name>`
+:::