at, batch: update pages (#14220)

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

pages/common/at.md

@@ -1,16 +1,24 @@
 # at
 
 > Execute commands once at a later time.
-> Service atd (or atrun) should be running for the actual executions.
+> Results will be sent to the users mail.
 > More information: <https://manned.org/at>.
 
-- Execute commands from `stdin` in 5 minutes (press `Ctrl + D` when done):
+- Start the `atd` daemon:
+
+`systemctl start atd`
+
+- Create commands interactively and execute them in 5 minutes (press `<Ctrl> + D` when done):
 
 `at now + 5 minutes`
 
+- Create commands interactively and execute them at a specific time:
+
+`at {{hh:mm}}`
+
 - Execute a command from `stdin` at 10:00 AM today:
 
-`echo "{{./make_db_backup.sh}}" | at 1000`
+`echo "{{command}}" | at 1000`
 
 - Execute commands from a given file next Tuesday:
 

pages/common/batch.md

@@ -1,17 +1,7 @@
 # batch
 
-> Execute commands at a later time when the system load levels permit.
-> Service atd (or atrun) should be running for the actual executions.
-> More information: <https://manned.org/batch>.
+> This command is an alias of `at`.
 
-- Execute commands from `stdin` (press `Ctrl + D` when done):
+- View documentation for the original command:
 
-`batch`
-
-- Execute a command from `stdin`:
-
-`echo "{{./make_db_backup.sh}}" | batch`
-
-- Execute commands from a given [f]ile:
-
-`batch -f {{path/to/file}}`
+`tldr at`

pages/linux/at.md

@@ -1,20 +0,0 @@
-# at
-
-> Executes commands at a specified time.
-> More information: <https://manned.org/at.1>.
-
-- Open an `at` prompt to create a new set of scheduled commands, press `Ctrl + D` to save and exit:
-
-`at {{hh:mm}}`
-
-- Execute the commands and email the result using a local mailing program such as Sendmail:
-
-`at {{hh:mm}} -m`
-
-- Execute a script at the given time:
-
-`at {{hh:mm}} -f {{path/to/file}}`
-
-- Display a system notification at 11pm on February 18th:
-
-`echo "notify-send '{{Wake up!}}'" | at {{11pm}} {{Feb 18}}`