Update cheatsheets

tldr/linux/batch

@@ -0,0 +1,23 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# batch
+
+> Execute commands at a later time when the system load levels permit.
+> Results will be sent to the user's mail.
+> See also: `at`, `atq`, `atrm` `mail`.
+> More information: <https://manned.org/batch>.
+
+- Start the `atd` daemon:
+
+`systemctl start atd`
+
+- Execute commands from `stdin` (press `<Ctrl d>` when done):
+
+`batch`
+
+- Execute a command from `stdin`:
+
+`echo "{{./make_db_backup.sh}}" | batch`