Move pages under tldr, lint run.sh, update docs

tldr/linux/gpasswd

@@ -0,0 +1,29 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gpasswd
+
+> Administer `/etc/group` and `/etc/gshadow`.
+> More information: <https://manned.org/gpasswd>.
+
+- Define group administrators:
+
+`sudo gpasswd -A {{user1,user2}} {{group}}`
+
+- Set the list of group members:
+
+`sudo gpasswd -M {{user1,user2}} {{group}}`
+
+- Create a password for the named group:
+
+`gpasswd {{group}}`
+
+- Add a user to the named group:
+
+`gpasswd -a {{user}} {{group}}`
+
+- Remove a user from the named group:
+
+`gpasswd -d {{user}} {{group}}`