lk/basics/at.md
Malin Freeborn ba8026e0c3
change formatting
input examples are now given as

```bash
input $ARG1
```

While outputs use md's '> ' sign as a quote.
2023-06-17 21:28:20 +02:00

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Markdown

---
title: "at"
tags: [ "Documentation", "Basics" ]
---
Install with:
```bash
sudo apt install at
```
Enable the daemon service with:
```bash
sudo systemctl enable --now atd
```
Then jobs can be specified with absolute time, such as:
```bash
at 16:20
```
```bash
at noon
```
```bash
at midnight
```
```bash
at teatime
```
Type in your command, e.g.:
```bash
touch /tmp/$FILE.txt
```
The jobs can also be specified relative to the current time:
```bash
at now +15 minutes
```
Finally, accept the jobs with ^D.
# Managing `at` Jobs
Display a list of commands to run with:
```bash
atq
```
> 2 Sat Oct 20 16:00:00 2018 a roach-1
This will print all pending IDs. Remove a job by the ID with:
```bash
atrm 2
```
Check `/var/spool/atd/` to see the jobs.
## Automation
Automatically add a job for later, by setting the date, then using echo for the command.
```bash
t="$(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)"`.