cron at specified time

[cicala]

hi,
is there a way to run a cron job at a specified hour of the day (not at a set interval)?
tnx

[Shotokan101]

hi,
is there a way to run a cron job at a specified hour of the day (not at a set interval)?
tnx

Yes - See crontab info - if it's a "runonce" type you require use the at command which is documented at the same link.

EDIT: although the RT F/W only seems to have crontab available if it's to schedule a task on an RT F/W supported router.

[cicala]

tnx for the answer...

i tried and it work: I'm trying to have the wlan go down and up at scheduled times so i entered in /var/spool/cron/crontabs/root

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0 8 * * * echo "begin;ap:settings/ap_enabled=1;end;begin;ap:status/cli_reboot;logic:command/save;end" | cm_cli_tty
30 23 * * * echo "begin;ap:settings/ap_enabled=0;end;begin;ap:status/cli_reboot;logic:command/save;end" | cm_cli_tty

now i would like to make the changes permanent so i tried using setenv autoexec.sh this way:

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setenv autoexec.sh "echo \"0 8 \* \* \* echo \\\"begin;ap:settings/ap_enabled=1;end;begin;ap:status/cli_reboot;logic:command/save;end\\\" | cm_cli_tty\">>/var/spool/cron/crontabs/root"

but when i type getenv i only see part of the string?? is there a limit of characters that can be typed in the envs??
also tried writing directly to /proc/sys/dev/adam2/environment but with the same resoult
any ideas?
tnx

[Shotokan101]

Sorry I'm not sure - if it works interactively then i suspect that the problem is with you trying to write to the router's flash - the autoxexc.sh example in the F/W documentation show how to use a script hosted on n external server though which you could try in the meantime I suppose till Biro or Chief can help out.....

NOTE: delete "*" in w*get in example below - need to allow posting only on forum for security purposes.....

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Examples:
1. autoexec.sh
e.g.,
setenv autoexec.sh "cd /var && w*get http://fpp.com/bar.sh && chmod a+x ./bar.sh && ./bar.sh"
This will set up the router to fetch a script (bar.sh) from a website, set its executable flag, and then run it, everytime the router boots up.

[thechief]

The adam2 environment is slightly brain dead and has a tight limit on the length of what you can store in each variable (I think the limit is 64 characters - but I may be wrong). PSPboot allows much longer values in environment variables. Your best bet is to put your command in a script, store the script on a web server, and then use autoexec.sh to download and run the script.

[cicala]

ok, that explains it..

thanx again for the great work

[jamon]

Code: Select all

Examples:
1. autoexec.sh
e.g.,
setenv autoexec.sh "cd /var && w*get http://fpp.com/bar.sh && chmod a+x ./bar.sh && ./bar.sh"
This will set up the router to fetch a script (bar.sh) from a website, set its executable flag, and then run it, everytime the router boots up.

If the FTP server isn't avaliable, what hapens?
Can you improve the script to try to download the "bar.sh" script up to the server is right and after execute it? I presume that the "autoexec.sh" script is executed before the WAN interface is up, right?

[jamon]

Looking to "/usr/local/bin/autoexec.sh" I suggest to change this:

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# make sure we have a WAN connection before starting
x=0
while [ $x -le 17 ]
do
  x=`expr $x + 1`
  if ping -c 1 google.com > /dev/null; then
        $@
        exit 0
  fi
  sleep 10
done

To do a ping to a environment var, like AUTOEXEC_SERVER_PING, and perhaps set it as default to "google.com" like now. With this change, I can set an internal FTP server and download my startup script from it, without worrying about if it's active or not.

You agree?

[thechief]

It may be possible - but I am not promising anything.

[snakessj]

Hi! I will schedule a job with crontab but, when I modify "/var/spool/cron/crontabs/root" adding a line such
"36 17 * * * wget -q -O /dev/null 'http://www.site.com/page.php'
and attending the time specified, nothing happens! What's wrong?

[thechief]

Is cron enabled? Is sntp enabled? What does "crontab -l" say?

[snakessj]

Is cron enabled?
I don't know! How verify?

Is sntp enabled?
I don't know! (What is?) How verify?

What does "crontab -l" say?
0 */1 * * * /usr/local/bin/memopt.sh& >/dev/null 2>&1
0 */1 * * * /usr/local/bin/chksync.sh& >/dev/null 2>&1
0 */2 * * * cat /proc/avalanche/avsar_modem_stats | grep Attenuation | logger

[thechief]

Advanced->sntp
Tools->RT configurations

[snakessj]

SNTP is active!

In don't have "RT configurations" the version of my firmware is "2.30" =\

My Tools menù:
System Commands
Remote Log
User Management
Update Gateway
Ping Test
Log Settings
Gateway System Information
System Diagnostics
Optimise RAM
Run Command
Reboot Router
Shutdown Router
Log Out

[thechief]

Post the output of "ps aux".