add chinese for pages.cn/linux/add-apt-respository.md

pages.cn/linux/ssh-add.md

@@ -0,0 +1,24 @@
+# ssh-add
+
+> Manage loaded ssh keys in the ssh-agent.
+> Ensure that ssh-agent is up and running for the keys to be loaded in it.
+
+- Add the default ssh keys in "~/.ssh" to the ssh-agent:
+
+`ssh-add`
+
+- Add a specific key to the ssh-agent:
+
+`ssh-add {{path/to/private_key}}`
+
+- List fingerprints of currently loaded keys:
+
+`ssh-add -l`
+
+- Delete a key from the ssh-agent:
+
+`ssh-add -d {{path/to/private_key}}`
+
+- Delete all currently loaded keys from the ssh-agent:
+
+`ssh-add -D`