Update cheatsheets

supervisorctl

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# supervisorctl
+
+> Supervisor is a client/server system that allows its users to control a number of processes on UNIX-like operating systems.
+> Supervisorctl is the command-line client piece of the supervisor which provides a shell-like interface.
+> More information: <http://supervisord.org>.
+
+- Show the status of a process (or all processes if `process_name` is not specified):
+
+`supervisorctl status {{process_name}}`
+
+- Start/stop/restart a process:
+
+`supervisorctl {{start|stop|restart}} {{process_name}}`
+
+- Start/stop/restart all processes in a group:
+
+`supervisorctl {{start|stop|restart}} {{group_name}}:*`
+
+- Show last 100 bytes of process `stderr`:
+
+`supervisorctl tail -100 {{process_name}} stderr`
+
+- Keep displaying `stdout` of a process:
+
+`supervisorctl tail -f {{process_name}} stdout`
+
+- Reload process configuration file to add/remove processes as necessary:
+
+`supervisorctl update`