change formatting

input examples are now given as

```bash
input $ARG1
```

While outputs use md's '> ' sign as a quote.

basics/at.md

@@ -4,29 +4,45 @@ tags: [ "Documentation", "Basics" ]
 ---
 Install with:
 
-> sudo apt install at
+```bash
+sudo apt install at
+```
 
 Enable the daemon service with:
 
-> sudo systemctl enable --now atd
+```bash
+sudo systemctl enable --now atd
+```
 
 Then jobs can be specified with absolute time, such as:
 
-> at 16:20
+```bash
+at 16:20
+```
 
-> at noon
+```bash
+at noon
+```
 
-> at midnight
+```bash
+at midnight
+```
 
-> at teatime
+```bash
+at teatime
+```
 
 Type in your command, e.g.:
 
-> touch /tmp/myFile.txt
+```bash
+touch /tmp/$FILE.txt
+```
 
 The jobs can also be specified relative to the current time:
 
-> at now +15 minutes
+```bash
+at now +15 minutes
+```
 
 Finally, accept the jobs with ^D.
 
@@ -34,24 +50,28 @@ Finally, accept the jobs with ^D.
 
 Display a list of commands to run with:
 
-> atq
+```bash
+atq
+```
 
-`2	Sat Oct 20 16:00:00 2018 a roach-1`
+> 2	Sat Oct 20 16:00:00 2018 a roach-1
 
 This will print all pending IDs.  Remove a job by the ID with:
 
-> atrm 2
+```bash
+atrm 2
+```
 
-Check /var/spool/atd/
+Check `/var/spool/atd/` to see the jobs.
 
 ## Automation
 
 Automatically add a job for later, by setting the date, then using echo for the command.
 
-> t="$(date -d "2 minutes" +%R)"
-
-> echo "fortune > ~/file" | at "$t"
-
-> watch cat file
+```bash
+t="$(date -d "2 minutes" +%R)"
+echo "fortune > ~/$FILE" | at "$t"
+watch cat $FILE
+```
 
 The `$t` here outputs the day in minutes, but you could also do `t="$(date -d "2 days" +%m/%d/%Y)"`.