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Script runs manually, but not from cron

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Top Forums Shell Programming and Scripting Script runs manually, but not from cron
# 1  
Old 05-27-2016
Script runs manually, but not from cron


I "borrowed" a script I found online, to start a SAP router application on a Solaris 11 (SPARC) server.

The script runs fine when calling it manually, but when I schedule it to run from cron, it doesn't. I don't see any warning or failure messages anywhere, just nothing happens.

Here is the relevant part of the script;

 # Set Variables
# End Variables
/usr/sap/saprouter/./saprouter -r -R "$ROUTDIR/saprouttab" -K "$DNAME" &

Here is the cron entry;

 00 10 * * 1-5 /usr/sap/saprouter/scriptname

Any ideas?

Thanks in advance.

Moderator's Comments:
Mod Comment Please use code tags as required by forum rules!


Last edited by RudiC; 05-27-2016 at 08:08 AM.. Reason: Added code tags.
# 2  
Old 05-27-2016
A background process finishes when its parent does unless disowned or nohupped.
# 3  
Old 05-27-2016
Is this a task, that must be run regularly, or is it a service, that should be run always and the cron-job is only to make sure it starts again in case it terminates?

If it is the latter, a service definition would be better. I myself have no knowledge how a service is set up in Solaris.

To just debug your cron-entry after you followed Rudis advice, I suggest doing redirecting of the output:

 00 10 * * 1-5 nohup /usr/sap/saprouter/scriptname >/tmp/saprouter.log 2>&1

Then you have a logfile where to look for errors.
# 4  
Old 05-27-2016
Thanks for your prompt responses.

This is a service that only needs to run for 15 minutes each day. There is another cron job to stop this at 10:15.

This is the output from the log file;

# more /tmp/saprouter.log
* ERROR SNC processing failed:
* SncInit
* TIME Fri May 27 13:00:00 2016
* COMPONENT NI (network interface)
* RC -17
* MODULE /bas/745_REL/src/base/ni/nisnc.c
* LINE 553
* DETAIL NiSncInit: sncrc=-1

trcfile dev_rout

According to SAP, this seems to indicate a problem with authentication. However, if I run the script manually, there is no error...

I should say, I also revised the crontab entry to include "nohup";

00 13 * * 1-5 nohup /usr/sap/saprouter/scriptname > /tmp/saprouter.log 2>&1

Moderator's Comments:
Mod Comment Better, but not quite there. Use code tags for data or output as well!

Last edited by RudiC; 05-27-2016 at 12:18 PM.. Reason: More information; RudiC: Corrected code tags
# 5  
Old 05-27-2016
Maybe the program needs a "terminal" attached to the process.

You may try to use it via screen in detached mode.

00 10 * * 1-5 screen -d -m /usr/sap/saprouter/scriptname

Probably you must get screen somehow installed first. When screen with the program is running, you can connect to it via screen -r and disconnect with [Ctrl] + [a] then [d].
# 6  
Old 05-27-2016
I Installed the "screen" package and updated cron as follows;

32 13 * * 1-5 screen -d -m /usr/sap/saprouter/scriptname > /tmp/saprouter.log 2>&1

Service still not starting and more oddly, no entry at all in the /tmp/saprouter.log file!

Last edited by bredman; 05-27-2016 at 10:19 AM.. Reason: Added code tags
# 7  
Old 05-27-2016
I assume the same error still happens. The log output is empty because screen itself does not output anything. The program does.

You may add sleep 120 at the end of the script /usr/sap/saprouter/scriptname (before exit!) and connect via screen -r as described above. Now you should see the error.

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