Questions tagged [at-command]

'at' reads commands from standard input or a specified file which is to be executed at a later time, using /bin/sh.

18 questions
8
votes
2 answers

How to send a notification using at command?

I have a bash script that runs periodically once a day using crontab . The script checks a condition, and if true, it should issue an at command at a specific time. at 14:10 <notify-send hello> The question is: how can I add a specific command like…
membersound
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5
votes
2 answers

`at` command: what is the meaning of the option `-w`?

I have a script that uses at command. And sometimes I receiving emails as this one: Date: Mon, 3 Jul 2017 14:18:00 +0300 (EEST) From: root <root@localhost.org> To: root@localhost.org Subject: Output from your job 173 Another app is currently holding…
pa4080
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5
votes
1 answer

How to change the default shell of at command

when I want to delay the execution of a program using at , it precise me that warning: commands will be executed using /bin/sh How the change this default shell, to bash for instance ?
Covich
  • 273
4
votes
1 answer

Why my 'at' clause command execute the shell immediately and ignored the time limit?

I wrote a shell named t.sh It's content is: touch 88888 The command I'm using is sh t.sh | at 03:13Jun15 After I execute this command, I got this show on my screen: warning: commands will be executed using /bin/sh job 9 at Sun Jun 15 03:13:00 2014…
ZengJuchen
  • 683
3
votes
4 answers

How to make my Ubuntu 16.04 system display a to-do reminder?

Sometimes I get interrupted while programming and would like to have some sort of alarm function that can remind me to do sometihing important. I do not want to build a clock, nor do I want the kind of thing my smartphone does. Just an on-screen…
SDsolar
  • 3,239
3
votes
2 answers

Why can't I use bash freely after using the "At" utility? (Can't insert stdin until ctrl+c)

I ran the following code block (an at timeout to uninstall PHPmyadmin). It should be scheduled to run 2 horus ahead, but I ran it in a timeout of 2 minutes, just to test it: bash /dev/fd/50 50<< PMA_UNINSTALL | at 'now + 2 minutes' apt-get purge…
user423047
3
votes
1 answer

at command in ubuntu error 'You do not have permission to use at'

Apologize in advance, I am pretty new at php and ubuntu. I have 2 servers set up, one for development and one for staging. On the dev machine I can use the at command without a problem, but on staging I get a permissions error. The at.deny (and…
fredjo
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3
votes
1 answer

Understanding the at-command to schedule another command

I use cron to schedule things in Linux, but recently I discovered the "at" command. sudo apt-get install at I don't understand the scope from which this command operates: How would you schedule a command with at, that normally requires admin…
Lonnie Best
  • 2,254
0
votes
1 answer

See the output of a scheduled task in the terminal

Is it possible to see the outputs of tasks, that are schedule with "at" in real-time? Say, I want to see the values of my loss function as I train my network.
Alderson
  • 103
0
votes
2 answers

CTRL+C doesn't help qutting "at" utility prompt. How to safely quit?

I ran the following code and when I reached the second heredoc I became stuck in an at prompt (see image below). How to safely quite from this (without braking anything)? The code: bash /dev/fd/40 40<< 'PMA' cat << PMA_UNINSTALL | at 'now + 2…
user423047
0
votes
2 answers

appends n-th line from the file x at the end of the file y

I have been asked to write a command that appends the n-th line ( MYN ) from a file ( x )to another file ( y ). Here's what I've done so far: MYN=4 hey=$(awk 'NR==$MYN' x) echo "$hey" >> y But why doesn't this work?
Martin Yeboah
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1 answer

"At" Command on WSL (Ubuntu 20.04)

I am using WSL (ubuntu 20.04) on my machine. Today I learned about the at command, which can be used for scheduling jobs. I attempted to use it on WSL but the job was not fired although its time came. Can't we use this command on WSL? If we can,…
mustafabaki
  • 105
0
votes
1 answer

How can I run a at command with existing environmental variables and libs?

Almost a duplicate question of this one , however, the answer in that post does not solve the environmental issue with at command. Problem description: I want to run my shell scripts with at command as a scheduled job. All my shell scripts run…
Albert G Lieu
  • 138
0
votes
1 answer

Running pwd command by using at - at doesn't do anything

I'm trying to learn how to use the at command and to do that I tried to run the pwd command, but it seems that nothing happens: How can I run a command like pwd by using at ?
Gennaro Arguzzi
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0 answers

Why `at` can't find `mail` even if it's in every path, including the systemd unit?

I'm trying to get the logs of at , which AFAIK are sent via local mail. The problem I'm having (on Ubuntu 20.04) is that I've configured the mail, and the PATH, but any time I execute at , the syslog reports: Dec 30 16:45:44 mymachine atd[5799]:…
Marcus
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