[SOLVED] The "at" command , cannot get it to work correctly

lwv962 · 09-02-2014, 01:12 PM

Quote:

In your .bashrc, in cadno function try to write the full path to radiotray just in case.

eg
Code:

cadno () {

/usr/bin/radiotray url goes here
}

Nothing happening !

haertig · 09-02-2014, 01:19 PM

I see one problem right here:

Code:

peter@peter-Lenovo-G580 ~ $ at now + 1 minute
warning: commands will be executed using /bin/sh
at> cd ~/rhag
...

Your tilde path, ~/rhag, is not going to be recognized by /bin/sh. /bin/bash knows how to handle a tilde, so does /bin/ksh (if that's installed on your system), but /bin/sh does not understand the tilde. Thus your cd will not work under /bin/sh, and /bin/sh is what "at" uses - says so right there when you invoke it. Skip the tilde and specify your path as /home/rhag (or whatever the correct path to your $HOME directory is).

Do not assume that /bin/sh points to /bin/bash. On my system it does not:

Code:

$ ls -l /bin/sh
lrwxrwxrwx 1 root root 4 Mar 11  2013 /bin/sh -> dash
$ ls -l /bin/dash
-rwxr-xr-x 1 root root 109768 Mar 29  2012 /bin/dash
$ ls -l /bin/bash
-rwxr-xr-x 1 root root 959120 Mar 28  2013 /bin/bash
$

haertig · 09-02-2014, 01:23 PM

Quote:

Only one thing puzzles me how would one activate a function that was in ~/bashrc ,~/bash_aliases or in a script ?

Remember, "at" is using /bin/sh, not /bin/bash. So /bin/sh is not going to understand those tildes, nor would it ever think to look in bashrc, etc. even if it did understand the tildes ... since it's not bash, it's sh.

keefaz · 09-02-2014, 01:41 PM

Quote:

Originally Posted by haertig

Do not assume that /bin/sh points to /bin/bash. On my system it does not:

Good point, I didn't think of that

lwv962, instead of source .bashrc, use . (dot)

Code:

. /home/peter/.bashrc

lwv962 · 09-03-2014, 05:56 AM

Whew !

This does work :

Code:

peter@peter-Lenovo-G580 ~ $ at now + 2  minutes 
warning: commands will be executed using /bin/sh
at> export DISPLAY=:0.0
at> . /home/peter/.bashrc
at> cadno
at> <EOT>
job 354 at Wed Sep  3 08:06:00 2014

I was so tired yesterday I was making all sorts of mistakes.

But I'm trying to get a one liner,this very crude script sort of works
BUT it runs without ANY DELAY WHATSOEVER

Code:

#!/bin/bash 

read -p "Enter time:" amser
at $amser
export DISPLAY=:0.0
. /home/peter/.bashrc
cadno
~                                                                               
~                                                                              
~                                                                               
~                                                                               
~                                                                               
~                                                                               
~                                                                               
~                                                                               
~                                                                               
~                                                                               
~                                                                               
~                                                                               
~                                                                               
~                                                                               
~                                                                               
~                                                                              d 
"atscript.sh" 7L, 100C                                        5,1           All

I would say my question is solved ; keefaz and haertig many thanks for patience and excellent help.
I hope by declaring this as solved it would still remain open ,for there are quite a few aspects of
this command that need to be explored ,as the Man Page is not very detailed.

keefaz · 09-03-2014, 08:16 AM

Quote:

Originally Posted by lwv962

BUT it runs without ANY DELAY WHATSOEVER

Your script doesn't pass the commands that follows at line to at...

What it does is run "at" at specified time with no command, and execute commands following at lines

try:

Code:

#!/bin/bash 

read -p "Enter time:" amser
at $amser <<END
export DISPLAY=:0.0
. /home/peter/.bashrc
cadno
END

lwv962 · 09-03-2014, 09:07 AM

Thanks keefaz ,

I messed that one !! Btw I've found this works without functions:

Code:

#!/bin/bash
 
r4= /usr/bin/radiotray http://.......

insp= /usr/bin/radiotray url or whatever the link is

they can be called from the CLI. as one did with the function.

BUT your sanitised version of my script allied with that list

file makes the use of a function unnecessary.

I don't what you think but "A HOW TO " on 'at" would be handy !?