Update cheatsheets

logger

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# logger
+
+> Add messages to syslog (/var/log/syslog).
+> More information: <https://manned.org/logger>.
+
+- Log a message to syslog:
+
+`logger {{message}}`
+
+- Take input from `stdin` and log to syslog:
+
+`echo {{log_entry}} | logger`
+
+- Send the output to a remote syslog server running at a given port. Default port is 514:
+
+`echo {{log_entry}} | logger --server {{hostname}} --port {{port}}`
+
+- Use a specific tag for every line logged. Default is the name of logged in user:
+
+`echo {{log_entry}} | logger --tag {{tag}}`
+
+- Log messages with a given priority. Default is `user.notice`. See `man logger` for all priority options:
+
+`echo {{log_entry}} | logger --priority {{user.warning}}`