72 replies to this topic

[marcus83]

hi guys!

 

Is there a plugin to manage Crontab?

 

I want to start a script every 60 minutes but giving the command nothing happens

 

my command:

 

crontab -e  */60 * * * * /usr/script/test5.sh >/tmp/cron.log

 

 

 

root@sf8008:~# crontab -e  */60 * * * * /usr/script/test5.sh >/tmp/cron.log
BusyBox v1.31.0 (2022-09-10 21:29:41 UTC) multi-call binary.

Usage: crontab [-c DIR] [-u USER] [-ler]|[FILE]

        -c      Crontab directory
        -u      User
        -l      List crontab
        -e      Edit crontab
        -r      Delete crontab
        FILE    Replace crontab by FILE ('-': stdin)

 

 

 

[neo]

Is cron itself installed and running?

 

And looking at the correct directory? I know there were some issues with that which are corrected in the current develop. (old images used /etc/cron, standard cron uses /var/spool/cron).

[marcus83]

yes in /var/spool/cron in OpenPLi 8.3

 

so are there any cron issues with the current image?

[marcus83]

root@sf8008:~# opkg list | grep cron

busybox-cron - 1.31.0-r0.127 - Tiny versions of many common UNIX utilities in a single small executable
cronie - 1.5.4-r0.0 - Cron daemon for executing programs at set times
cronie-dbg - 1.5.4-r0.0 - Cron daemon for executing programs at set times - Debugging files
cronie-dev - 1.5.4-r0.0 - Cron daemon for executing programs at set times - Development files
cronie-doc - 1.5.4-r0.0 - Cron daemon for executing programs at set times - Documentation files

root@sf8008:~# opkg list-installed | grep cron

busybox-cron - 1.31.0-r0.127
root@sf8008:~#

[neo]

root@sf8008:~# opkg list-installed | grep cron

busybox-cron - 1.31.0-r0.127

 

That's ok.

 

yes in /var/spool/cron in OpenPLi 8.3

 

so are there any cron issues with the current image?

 

It's been to long since I've used a release image. Check

grep ARGS= /etc/init.d/busybox-cron

to see what path is used by cron.

Edited by neo, 14 June 2023 - 19:01.

[marcus83]

 

root@sf8008:~# opkg list-installed | grep cron

busybox-cron - 1.31.0-r0.127

 

That's ok.

 

yes in /var/spool/cron in OpenPLi 8.3

 

so are there any cron issues with the current image?

 

It's been to long since I've used a release image. Check

grep ARGS= /etc/init.d/busybox-cron

to see what path is used by cron.

 

root@sf8008:~# grep ARGS= /etc/init.d/busybox-cron
ARGS="-c /var/spool/cron/crontabs"

[neo]

That's ok.

 

Now that I think of it, I don't think busybox' crontab supports the "-e" commandline syntax. Just use "crontab -e" and then enter you command in the editor that opens...

 

Also, I wonder if "*/60 * * * *" is accepted, for "once every hour", it is better to use "* */1 * * *"

Edited by neo, 14 June 2023 - 19:21.

[scriptmelvin †]

Or just simply "0 * * * *"

[s3n0]

Hi.

 

If you tell the cron service that "here is a file", it understands it as an executable binary. That's why you have to run the shell script through an interpreter. For example like this:

* */1 * * *     /bin/bash /usr/script/test5.sh > /tmp/test5.log

The first value */60 at the beginning is of course an error ! A slash marks every N-th repetition, i.e. "stepping size". You used it for the first value from the left which represents minutes. So you want to repeat the same thing every 60 minutes ? That's nonsense ;-). Simply put the fixed value 0 there. So the result will look like this:
0 * * * *
https://crontab.guru/#0_*_*_*_*

“At minute 0  (whenever the minute hand on the real time clock points to zero).”

 

...but the correct expression is also this:
0 */1 * * *

https://crontab.guru...u/#0_*/1_*_*_* 

“At minute 0 past every hour.”

 

Cron works by checking the clock status every minute... as the match:
minutes hours day month week
If the Cron process finds a match with your time data setting with the real clock, then the command that is listed after this time data is executed.

 

Also, allowed numerical values for hours and minutes are only 0 to 59. Yes, even zero is a number ! Together with the zero number, there are basically 60 variations altogether. For example, if you wanted to run something every 30 minutes, then you would use this:
*/30 * * * *

https://crontab.guru/#*/30_*_*_*_*

 

You should also check if your shell script is working properly. It should contain the hashtag: #!/bin/bash on the very first line, and it should also contain newline codes according to Unix, not according to Windows (you can check this in Notepad++, for example).

[Pike_Bishop]

 i make my cronjobs always this way for scripts;

(crontab -l 2>/dev/null; echo "* * * * * sh /usr/script/wz_box_cifswithcron_link.sh") | crontab -

or with a script with name cronjob.sh in /etc/init.d;

 

#!/bin/sh

#

# cronjob.sh to make a cronjob with a init script

#

CRON_VERZ=/var/spool/cron/crontabs

CRON_FILE=root

 

. /etc/default/rcS

 

 

if [ ! -e $CRON_VERZ/$CRON_FILE ]; then

(crontab -l 2>/dev/null; echo "0 2,3,4,5 * * 0,1,2,3,4 sh /usr/script/standby.sh") | crontab -

(crontab -l 2>/dev/null; echo "30 2,3,4,5 * * * sh /usr/script/standby.sh") | crontab -

(crontab -l 2>/dev/null; echo -e "0 3,4,5 * * 5,6 sh /usr/script/standby.sh\n") | crontab -

fi

 

 

#if ! grep "ext_hdd_backup1_set_unset_link.sh" $CRON_VERZ/$CRON_FILE ; then

# (crontab -l 2>/dev/null; echo "* * * * * sh /usr/script/ext_hdd_backup1_set_unset_link.sh") | crontab -

#fi

 

 

if ! grep "wz_box_cifswithcron_link.sh" $CRON_VERZ/$CRON_FILE ; then

(crontab -l 2>/dev/null; echo "* * * * * sh /usr/script/wz_box_cifswithcron_link.sh") | crontab -

fi

 

if ! grep "wz_box_nfswithcron_link.sh" $CRON_VERZ/$CRON_FILE ; then

(crontab -l 2>/dev/null; echo "* * * * * sh /usr/script/wz_box_nfswithcron_link.sh") | crontab -

fi

 

 

(crontab -l 2>/dev/null; echo "* * * * * sh /usr/script/hiddenmount.sh") | crontab -

 

 

: exit 0

 

and they works perfect in openpli-8.3

 

so that;

(crontab -l 2>/dev/null; echo "* */1 * * * sh /usr/script/test5.sh >/tmp/cron.log") | crontab -

i think did work for @marcus83

 

 

regards

Pike

Edited by Pike_Bishop, 14 June 2023 - 20:31.

[s3n0]

@marcus83:

 

In addition to the above-mentioned errors that I fixed for you, I also add that I edit the configuration file manually, via FTP connection:

/etc/cron/crontabs/root

 

Then I simply save the file back via FTP and restart the CRON service via the "init.d" shell script:

- for OpenATV: /etc/init.d/crond {start|stop|restart}

- for OpenPLi:  /etc/init.d/busybox-cron {start|stop|restart}

[neo]

( assuming you haven't replaced busybox-cron by crond )

[marcus83]

 i make my cronjobs always this way for scripts;

(crontab -l 2>/dev/null; echo "* * * * * sh /usr/script/wz_box_cifswithcron_link.sh") | crontab -

or with a script with name cronjob.sh in /etc/init.d;

 

#!/bin/sh

#

# cronjob.sh to make a cronjob with a init script

#

CRON_VERZ=/var/spool/cron/crontabs

CRON_FILE=root

 

. /etc/default/rcS

 

 

if [ ! -e $CRON_VERZ/$CRON_FILE ]; then

(crontab -l 2>/dev/null; echo "0 2,3,4,5 * * 0,1,2,3,4 sh /usr/script/standby.sh") | crontab -

(crontab -l 2>/dev/null; echo "30 2,3,4,5 * * * sh /usr/script/standby.sh") | crontab -

(crontab -l 2>/dev/null; echo -e "0 3,4,5 * * 5,6 sh /usr/script/standby.sh\n") | crontab -

fi

 

 

#if ! grep "ext_hdd_backup1_set_unset_link.sh" $CRON_VERZ/$CRON_FILE ; then

# (crontab -l 2>/dev/null; echo "* * * * * sh /usr/script/ext_hdd_backup1_set_unset_link.sh") | crontab -

#fi

 

 

if ! grep "wz_box_cifswithcron_link.sh" $CRON_VERZ/$CRON_FILE ; then

(crontab -l 2>/dev/null; echo "* * * * * sh /usr/script/wz_box_cifswithcron_link.sh") | crontab -

fi

 

if ! grep "wz_box_nfswithcron_link.sh" $CRON_VERZ/$CRON_FILE ; then

(crontab -l 2>/dev/null; echo "* * * * * sh /usr/script/wz_box_nfswithcron_link.sh") | crontab -

fi

 

 

(crontab -l 2>/dev/null; echo "* * * * * sh /usr/script/hiddenmount.sh") | crontab -

 

 

: exit 0

 

and they works perfect in openpli-8.3

 

so that;

(crontab -l 2>/dev/null; echo "* */1 * * * sh /usr/script/test5.sh >/tmp/cron.log") | crontab -

i think did work for @marcus83

 

 

regards

Pike

hi!

 

with this command works! thx!

 

(crontab -l 2>/dev/null; echo "* */1 * * * sh /usr/script/test5.sh >/tmp/cron.log") | crontab -

 

but with * */1 * * * does the script start every hour?

 

Can you also tell me the command to remove it?

[marcus83]

Pike_Bishop

 

I understood how to modify and eliminate, I just want to know how long  * */1 * * *  does it start?

Edited by marcus83, 15 June 2023 - 05:42.

[Tech]

Pike_Bishop

 

I understood how to modify and eliminate, I just want to know how long  * */1 * * *  does it start?

I thought that was explained overhere

[marcus83]

 

Pike_Bishop

 

I understood how to modify and eliminate, I just want to know how long  * */1 * * *  does it start?

I thought that was explained overhere

 

thx!

[marcus83]

Cron also works when the decoder is in standby?

[marcus83]

Cron also works when the decoder is in standby?

 

[auto answer]

It works perfectly on standby

[s3n0]

@marcus83

 

Why don't you read what I write ?

 

Please click on the link (I mean "crontab.guru" webpage), which I sent you before !!! There it is explained in human language, when exactly the specified time-entry will be started, in the CRON configuration line . This website is designed for exactly this purpose, or primarily for this purpose:

https://crontab.guru/

Edited by s3n0, 15 June 2023 - 09:48.

[marcus83]

@marcus83

 

Why don't you read what I write ?

 

Please click on the link (I mean "crontab.guru" webpage), which I sent you before !!! There it is explained in human language, when exactly the specified time-entry will be started, in the CRON configuration line . This website is designed for exactly this purpose, or primarily for this purpose:

https://crontab.guru/

yes I have already thanked @Tech for this...