Update cheatsheets

ssh-add

@@ -0,0 +1,34 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# 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.
+> More information: <https://man.openbsd.org/ssh-add>.
+
+- 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`
+
+- Add a key to the ssh-agent and the keychain:
+
+`ssh-add -K {{path/to/private_key}}`