topic Re: cron executable in Operating System - HP-UX

cron executable

Donald Thaler — Tue, 20 Apr 2010 14:09:28 GMT

where does the executable cron exist... i opened /var/spool/crontabs/root in a text editor (using exceed), but when i change the source it doesn't really change the executable version. i ran into this problem becuase exceed version 10 (using opentexts secure shell) opens the the crontab -e in a terminal window and not a text editor like it used to. their supposedly researching the problem, but in the interim if i need to change the crontab where would i find the executable version ?

Re: cron executable

Raj D. — Tue, 20 Apr 2010 14:24:15 GMT

Donald,
I think you are looking for the path for the crontab executable file:
It reside in /usr/bin/
i.e # /usr/bin/crontab

You can also type from the prompt:
$ whereis crontab

Hth,
Raj.

Re: cron executable

Raj D. — Tue, 20 Apr 2010 14:32:05 GMT

Also if cron is not running ,
do the following:
# /sbin/init.d/cron stop ### to stop cron
# /sbin/init.d/cron start ### to start cron

or type:
# /usr/sbin/cron

-to check:
# ps -ef | grep -i cron

Cheers,
Raj.

Re: cron executable

Patrick Wallek — Tue, 20 Apr 2010 14:38:00 GMT

>> if i need to change the crontab where would i find the executable version ?

You don't. Changing the crontab just changes the file in /var/spool/cron/crontabs/. The cron daemon then picks up the changes to the crontab file.

There is no such thing as an executable crontab file.

Re: cron executable

Steven Schweda — Tue, 20 Apr 2010 14:53:24 GMT

As usual, some minimal system info might be
nice to see.

uname -a

> [...] The cron daemon then picks up the
> changes to the crontab file.

Not without some help, it doesn't. Which is
why one uses "crontab -e" instead of simply
editing the actual crontab file.

man crontab
man cron

> [...] their supposedly researching the
> problem [...]

"They're"?

Re: cron executable

Pete Randall — Tue, 20 Apr 2010 15:00:26 GMT

You can also just use "crontab -l > /home/me/mycronfile" to produce an editable file of your crontab entries. Then, after you edit that file (I use vi) you just use "crontab /home/me/mycronfile" to schedule your modified crontab.

Pete

Re: cron executable

Donald Thaler — Tue, 20 Apr 2010 15:25:58 GMT

the reference to they was 'opentext' who is now the supplier of exceed (formerly hummingbird)... i never knew that when you ran crontab -e that behind the sceenes it acutally ran the crontab process... so until opentext fixes their problem i have to run
crontab /var/spool/cron/crontabs/root to schedule the changes... thanks to everyone that responded

Re: cron executable

Patrick Wallek — Tue, 20 Apr 2010 15:30:14 GMT

Having just reread your initial description...

>>opens the the crontab -e in a terminal window

Are you sure that when it opens the crontab in a terminal, that that isn't actually opening in the 'vi' editor in that terminal? If it is vi, you should still be able to make your changes.

Re: cron executable

Donald Thaler — Wed, 21 Apr 2010 18:20:23 GMT

you were right it's opening it in a vi window.. it used to open using the editor that comes with the common desktop environment.. when i look at the env variables i see that editor=vi, would you happen to know what that should be changed to, to invoke the cde editor ??

Re: cron executable

Steven Schweda — Wed, 21 Apr 2010 18:57:26 GMT

> you were right [...]

So was "man crontab".

> [...] i see that editor=vi, [...]

Do you mean "EDITOR=vi"? (Or do you have the
only case-insensitive UNIX system in
captivity?)

> [...] would you happen to know what that
> should be changed to, to invoke the cde
> editor ??

Know? No. Guess: dtpad.

man dtpad

If I wanted exotic command-line options, I'd
create a script in a convenient place, and
then specify "EDITOR=that_script". Expect it
to need to pass a command-line argument.

Re: cron executable

Alex Glennie — Wed, 21 Apr 2010 19:41:24 GMT

if dtpad fails .... try dtterm,xterm or hpterm

Re: cron executable

Patrick Wallek — Wed, 21 Apr 2010 19:50:33 GMT

>>try dtterm,xterm or hpterm

I'm not sure what that would accomplish, other than just opening a terminal window.

I tried setting EDITOR=xterm on a Linux system and it did not work well. It opened a new xterm window, but the crontab file did not show up in an editor, which is about what I would expect.

I set EDITOR=gedit and then did a 'crontab -e' and the gedit editor opened and functioned quite well with the crontab file.

I would expect dtpad to work. You may need to give the full path to dtpad if it doesn't work with just EDITOR=dtpad.

Re: cron executable

Alex Glennie — Wed, 21 Apr 2010 19:51:29 GMT

Donald ignore earlier post.

How or rather what are you running under exceed ? in otherwords are you logging into CDE, running a command via a terminal session or something else ?

within the terminal window type echo $TERM ?
result ?
export TERM=dtterm
try a crontab -e ?
result ?

If you can login via CDE let me know I'm more familar with that interface but have an old version of Exceed if needed if I boot into windows. currently uncertain if this is a bug or an issue with exceed/unix settings ....

Re: cron executable

Alex Glennie — Wed, 21 Apr 2010 19:53:07 GMT

Patrick,

Totally agree .... moment of madness

Re: cron executable

Donald Thaler — Wed, 21 Apr 2010 19:57:38 GMT

dtterm worked... thanks to all...

i'm using exceed v10 with their secure shell v10 ...i'm guessing that in the command option that looks like "/usr/dt/bin/dtsession &", i need to add EXPORT=dtterm

Re: cron executable

Donald Thaler — Wed, 21 Apr 2010 20:11:34 GMT

ooops it was dtpad that worked...

Re: cron executable

Steven Schweda — Wed, 21 Apr 2010 21:04:46 GMT

> [...] i need to add EXPORT=dtterm

> ooops it was dtpad that worked...

And it wasn't "EXPORT=", either. You (and
your readers) might profit if you explored
the benefits of using that newfangled
copy+paste technology. As the eminent
Abraham Van Helsing once said, "[...]
knowledge is stronger than memory, and we
should not trust the weaker." Or as an
automotive expert on NPR once said, "If you
don't think too good, don't think too much."