All Questions
500
questions
35
votes
4
answers
34k
views
"tput: No value for $TERM and no -T specified " error logged by CRON process
We have a shell script which is run by CRON. The shell script in turn runs a python script which downloads files from an FTP server and then runs a java log processor on those files. The process runs ...
- 11
382
votes
22
answers
447k
views
Where can I set environment variables that crontab will use?
I have a crontab running every hour. The user running it has environment variabless in the .bash_profile that work when the user runs the job from the terminal, however, obviously these don't get ...
- 11
30
votes
7
answers
94k
views
Cannot get cron to work on Amazon EC2?
I've spent two days trying to understand why I can not get cron to work on my Ubuntu EC2 instance. I've read the documentation. Can anyone help? All I want is to get a working cronjob.
I am using a ...
- 4,057
0
votes
0
answers
112
views
How to make a cron job with random offset
I have many services that need perform a sync job every 10 minutes, since these containers are using a shared resource it is not desirable, that they all do the syncing at the same time. I want to ...
- 748k
23
votes
2
answers
3k
views
How is % (percent sign) special in crontab?
In crontab, can you do something like this?
* * * * * echo $( date +%F) >> /path/date.txt
89
votes
15
answers
122k
views
How to instruct cron to execute a job every second week?
I would like to run a job through cron that will be executed every second Tuesday at given time of day. For every Tuesday is easy:
0 6 * * Tue
But how to make it on "every second Tuesday" (or if you ...
155
votes
21
answers
94k
views
How can I programmatically create a new cron job?
I want to be able to programatically add a new cron job, what is the best way to do this?
From my research, it seems I could dump the current crontab and then append a new one, piping that back into ...
- 163k
132
votes
7
answers
135k
views
A cron job that will never execute
Is there any way to create a cron expression for not running the job at all?
I though of using this expression :
0 0 0 1 1 ? 3099
...which will practically do the job as it will run on year 3099, ...
- 410
1001
votes
25
answers
1.1m
views
How do I list all cron jobs for all users?
Is there a command or an existing script that will let me view all of a *NIX system's scheduled cron jobs at once? I'd like it to include all of the user crontabs, as well as /etc/crontab, and ...
- 7,799
1
vote
1
answer
144
views
How to have an environment variable with quotes in crontab
I have a minimum example of my problem, which is trying to install a crontab that looks like this:
FOO="foo\"bar\"bin"
0 0 1 * * ls
by running crontab crontab (I have it in a ...
- 285k
33
votes
6
answers
42k
views
Why ssh fails from crontab but succeeds when executed from a command line?
I have a bash script that does ssh to a remote machine and executes a command there, like:
ssh -nxv user@remotehost echo "hello world"
When I execute the command from a command line it works fine, ...
- 196
45
votes
11
answers
33k
views
ssh-agent and crontab -- is there a good way to get these to meet?
I wrote a simple script which mails out svn activity logs nightly to our developers. Until now, I've run it on the same machine as the svn repository, so I didn't have to worry about authentication, ...
- 5,050
54
votes
4
answers
103k
views
Test run cron entry
I added a cron job recently, but made a mistake in the path while giving the command and hence, the job never succeeded. Is there some way to test the cron changes we have done?
Please note that I ...
- 163k
73
votes
3
answers
107k
views
How to skip saturday and sunday in a cron expression? [closed]
Hi I want to create a cron expression excluding saturday and sunday.
78
votes
2
answers
36k
views
How does cron internally schedule jobs?
How do "modern" cron daemons internally schedule their jobs? Some cronds used to schedule a run every so often via at. So after a crontab is written out, does crond:
Parse the crontab for all ...
- 18.5k