cron issue

[newunix]

after setting cron as
cat samplecron

0,10,20,30,40,50 * * * * /usr/bin/bdf >> /tmp/bdf.log

i can get the output but my problem is

if i schedule new cron job and i execute crontab filename ,, previous running cron job get removed.

how can i preserve the previous running cron jobs.

[Elmar P. Kolkman]

You can do that by adding the entries together. With the crontab -l command you can view your current jobs.

Easiest way:
$ crontab -l >oldcron.txt
$ cat oldcron.txt newcron.txt | crontab -

[Dennis Handly]

>how can I preserve the previous running cron jobs.

Your crontab entry must contain ALL of your jobs. If you want to add more, you can use "crontab -e".

[Hakki Aydin Ucar]

Hi,
How did you enter new cron jab ?
crontab -e ??

You mean after save the crontab, you cannot see your previous job anymore inside cron with the command:
# crontab -l ??

[newunix]

hi hakki

when i created first cron job i used vi samplecron

then i executed crontab firstcronjob

for adding second cron job for the same user again i used vi editor and i executed
crontab secondcronjob

after that i listed jobs with crontab -l ,, firstcronjob was missing

[Dennis Handly]

>and I executed crontab secondcronjob

That's what Hakki suspected. You can't do that. You must put ALL of your user's crontab entries in one "logical" file. The one you pass to crontab(1).

[Steven Schweda]

> cron issue

Is that anything like a _problem_?

> [...] and i executed
> crontab secondcronjob

man crontab

Not knowing your HP-UX version, I can't quote
the exact text, but I'd guess that it says
something like:

Create or replace your crontab file by
copying the specified file, [...]

Nothing there about "appending the specified
file".


> crontab -e ??

You might consider using that option.

[newunix]

so if i want to add another cron job for the same user ,,,

i have to use crontab -e and add the second job.

after that do i need to execute
crontab secondjob

[newunix]

can i have an example for particular user having one job already and to add another cron job.

[Dennis Handly]

>I have to use crontab -e and add the second job. after that do i need to execute: crontab secondjob

No, you keep using "crontab -e". Or you can use "crontab -l" and put that in a file and resubmit that file with your changes.

>can I have an example for particular user having one job already and to add another cron job.

Use "crontab -e" to edit your existing crontab entry. Then add as many as you want.

Note: One problem with "crontab -e" is that you don't have a backup if your disks crash and it isn't in a source management system.

So you could just start with a file and just add to it, then use "crontab file" each time.