at - warning: commands will be executed using /bin/s

RGummi · 10-11-2006, 02:43 PM

Hello,

is there a way to switch off the stupid output of at "warning: commands will be executed using /bin/s"? I have tried to send the stderr output to /dev/null, this works but the text with the job number is also send to /dev/null! So I'am looking for a switch to tell at that I dont'need this warning!

Thanks
R

druuna · 10-12-2006, 07:32 AM

Hi,

You need to tell at which shell to use (/bin/s is not a valid shell, you should look into this!)

Use one of the following to tell at which shell to use (if present):
-c C shell. csh(1) is used to execute the at-job.
-k Korn shell. ksh(1) is used to execute the at-job.
-s Bourne shell. sh(1) is used to execute the at-job.

If you do not use one of the above the value of the SHELL variable will be used (which probably points to /bin/s, which is incorrect).

man at for details.

Hope this helps.

RGummi · 10-12-2006, 12:01 PM

Hi,

yes you are right! It says "warning: commands will be executed using /bin/sh"
I have tried at -s but it says -s is an invalid option. man at does not say anything about -s, -c -k option.

at -V says
at version 3.1.8

R

haertig · 10-12-2006, 01:58 PM

Here's how I'd do it:

Code:

$ echo 'echo hello >/dev/null' | at now + 2 min >/dev/null 2>&1

This command creates the at job, silently.

Then come back later to investigate what you need:

Code:

$ at -l
$ at -c <jobnumber>
$ atrm <jobnumber>

The first command lists all your current at jobs (jobnumber and time of execution)
The second shows the details of a specific jobnumber
The third deletes a specific jobnumber

[edit]

p.s. - If you want a one-liner that mimics what you are asking to do, here's one:

Code:

echo "echo hello > /dev/null" | at now + 2 min 2>/dev/null; at -l | tail -n1

[/edit]

RGummi · 10-13-2006, 12:34 PM

Hi,

thanks!

now I do the following:

echo $cmd | at $time $date 2>&1 | tail -n 1

this is perfect!

RGummi