Update Usage

Usage.md

@@ -1,3 +1,44 @@
+## Examples for alias in bash
+
+```bash
+## Optional: generate key, replace `mysecretkey`
+
+openssl rand -hex 32
+
+## Upload to linedump
+
+ldup() {
+  local dir="${1:-.}"
+  local key="${2:-mysecretkey}"
+  tar cz "$dir" \
+    | openssl enc -aes-256-cbc -pbkdf2 -salt -base64 -pass pass:"$key" \
+    | curl -sS -X POST --data-binary @- https://linedump.com
+}
+
+## Download and extract from linedump in current directory
+
+lddown() {
+  local paste_id="$1"
+  local key="${2:-mysecretkey}"
+  curl -s "https://linedump.com/${paste_id}" \
+    | base64 -d \
+    | openssl enc -d -aes-256-cbc -pbkdf2 -pass pass:"$key" \
+    | tar xz
+}
+
+## Examples
+# key is optional, as it would have been the default
+
+ldup ./data mysecretkey
+
+# replace `abc123` with paste_id of the upload
+
+lddown abc123 mysecretkey
+
+```
+
+---
+
 ## Transfer directories or binary files
 
 **Unencrypted**: