Add examples

src/nix/store-copy-log.md

@@ -2,7 +2,27 @@ R""(
 
 # Examples
 
-TODO
+* To copy the build log of the `hello` package from
+  https://cache.nixos.org to the local store:
+
+  ```console
+  # nix store copy-log --from https://cache.nixos.org --eval-store auto nixpkgs#hello
+  ```
+
+  You can verify that the log is available locally:
+
+  ```console
+  # nix log --substituters '' nixpkgs#hello
+  ```
+
+  (The flag `--substituters ''` avoids querying
+  `https://cache.nixos.org` for the log.)
+
+* To copy the log for a specific store derivation via SSH:
+
+  ```console
+  # nix store copy-log --to ssh-ng://machine /nix/store/ilgm50plpmcgjhcp33z6n4qbnpqfhxym-glibc-2.33-59.drv
+  ```
 
 # Description