Cron is a job scheduler that allows users to run commands periodically.

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2
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2answers
225 views

Why does my cronjob not execute my shell-script?

I have a crontab that creates a dump of my database every night: 20 3 * * * /path/to/dailydump.sh dailydump.sh contains: #!/bin/sh DATENAME=`date +%Y%m%d` ...
0
votes
1answer
163 views

Adding timestamp into log file via cronjob command [duplicate]

I try to run git pull command with loging output message to file every 5 minutes. But i got error like this, (root) CMD (cd /var/www/sites/ && git pull origin master | sed -e "s/^/$(date ...
7
votes
3answers
29k views

How do I find out why cron is not running my jobs?

I'm using Ubuntu 14.04, and the cron daemon is running: # ps ax | grep cron 822 ? Ss 0:00 cron but it is not executing any jobs. I was previously getting entries in /var/log/syslog such ...
-4
votes
1answer
117 views

Run an application at each system boot in Arch Linux [duplicate]

I am using Arch Linux. I don't have any special permissions, I am just user without any special privileges. I want to start an application after each boot. I have already tried using crontab jobs, ...
6
votes
2answers
2k views

Have cron email output to MAILTO based on exit status

I have a cron job running a php command like this: php /path/to/script.php > dev/null This should send only STDERR output to the MAILTO address. From what I gather the php script is not ...
0
votes
1answer
33 views

Disable log of specified crontab item

How can i disable logging for specified item/line in crontab? (i´m on debian/raspbian) I have a script that checks if wlan0 is up every minute, but i don't like that cron logs every minute on syslog ...
1
vote
1answer
611 views

how to pass a password with a cron job safely?

I have a site map generator script placed in this URL http://www.mydomain.com/admin/sitemapgen/ However this URL is protected with an username and a password in auth_type basic method. I need to ...
0
votes
0answers
65 views

terminal linux calendar specify used calendar file

I´m playing around with linux calendar My aim is that all users can run a script which does nothing more than adding a givven argument in 10 days as cal item // called like this: reminder "Meeting ...
0
votes
1answer
144 views

Running smsd gnokii on boot

I can successfully run smsd but I could not run it on boot. I tried using rc.local and @reboot cronjob but none of the two worked. Does anyone tried to successfully run the script on boot?
1
vote
1answer
8k views

Where to find the Crontab logs in CentOS

First of all I'm using CentOS [root@a etc]# cat system-release CentOS release 6.5 (Final) [root@a cron.daily]# ps -ef | grep cron root 982 1 0 Jun14 ? 00:01:15 crond root ...
2
votes
0answers
44 views

Strange cron behaviour

I have a script that reads a list of IPs from a file, compares with the existing ones in a chain, and adds recently added IPs in the file into that chain. Running the script manually (e.g., ./script) ...
1
vote
0answers
34 views

Can I change the exclude file list while running rsync under a cron job

I am using Fedora 20, MATE desktop, zshell. I have started a cronjob to run, every evening, an incremental backup using rsync, closely following the suggestions here. After the first run yesterday, ...
1
vote
1answer
34 views

Switching shells for one cron job

Say I have the following in my crontab: * * * * * command1 -option A; command2; command3; etc. I would like cron to run the commands I have in that line with a specific shell. How can I do that? ...
1
vote
1answer
88 views

Get chronological list of dates & times for scheduled tasks in cron

Given a job specification in crontab, is there any way to get the list of dates and times the job in cron will run in the next week? For example, given a string 10 13 * * *, is there any way to get ...
17
votes
6answers
47k views

Why did my crontab not trigger?

I used crontab -e to add the following line to my crontab: * * * * * echo hi >> /home/myusername/test Yet, I don't see that the test file is written to. Is this a permission problem, or is ...
0
votes
1answer
131 views

Where is NMon cron job for AIX?

While trying to know where is NMon job configured to run; I do find that it's NOT listed on Crontab (using crontab -l). BUT - the job is currently running as expected, which is weird. See the ...
0
votes
2answers
108 views

bash script cronjob not working

Why is the cronjob below not working? As manually executed script is working, but if I put it on cron job it doesn't push through. #--------Reports------------- 25 11 * * * ...
0
votes
0answers
358 views

Issue running Python script via cron inside Docker

I have an official Ubuntu 14.04.1 container running via Docker. cron is working fine, I added * * * * * /bin/echo "working" >> /test to my crontab using crontab -e and then I started cron with ...
0
votes
1answer
51 views

SASL authentication fails when called from crontab

When I run mbsync from the command line it works fine. But if mbsync is run from the crontab, mbsync fails with this error "Error: SASL(-1): generic failure:". My guess is that mbsync's SASL ...
0
votes
1answer
63 views

How do I suppress all email notification from cron for particular job?

I am scheduling the following shell script #!/bin/bash (echo open mailserver.nowhere.local 25; sleep 1; echo EHLO; echo quit)\ | telnet | grep "?Invalid command" if [ $? -eq 1 ]; then ...
1
vote
2answers
310 views

Cron several script every 5 minutes with 10 second between each script

I have several file setup in my crontab, all those scripts must run every 5 minutes. The problem comes when those script need to much CPU and IO at a time and the machine become unavailable. To ...
2
votes
2answers
1k views

Need help with a script to test for memory usage [closed]

I'm trying to put up a temporary band-aid while I work out a solution for a app's memory leak. What I wrote was a small bash script that I put in the root on the server. This is what the script is ...
2
votes
1answer
53 views

How to suspend a process for a certain period of time?

I have several running processes which is started by a shell, but I don't want them to run during 08:00am - 20:00pm for each day because they are really bandwidth-consuming, so , I have to suspend ...
1
vote
0answers
68 views

Logrotate or scripting to manipulate log file

I want to make sure that a certain log file gets empty when it reaches a specific size. I first used logrotate since the man page says: It will not modify a log multiple times in one day unless ...
1
vote
1answer
77 views

In crontab, @reboot is working but regular not working

I am studying linux on my raspberry pi that installed debian version. There were no problem, worked perfectly in crontab, but something has occured. @reboot sudo bash /home/pi/IP_check.sh */10 ...
2
votes
2answers
425 views

systemd - Timer units that mimic anacron behaviour

I need to write a timer unit for a machine which is turned of frequently (e.g. classical desktop setup). This timer unit needs to be activated regularly but not very often (e.g. weekly, monthly). I ...
1
vote
1answer
37 views

Killing a process with cron as soon as it starts

I want to stop dropbox from running as soon as I log into my account. Now I know I could do this simply by going to Startup Applications and disabling dropbox. But I was wondering if there is a ...
1
vote
0answers
59 views

How to monitor the integrity of a script that is running?

I want to make sure a running python script was not modified accidentally by some other process (or cosmic ray, or unexpected developer update). I've heard of comparing a checksum of the script (e.g. ...
2
votes
2answers
56 views

Changing user's wallpaper via system crontab

I tried to set up wallpaper change via cron in /etc/crontab, but I failed. DISPLAY env set directly / before cmd, but still it's not working: DISPLAY=:0.0 * * * * * ad env DISPLAY=:0.0 ...
1
vote
0answers
33 views

How to set one job to run at precise time with anacron without losing config at next upgrade?

I want logrotate to run at a precise time daily. Currently it is set to run at some random time using anacron and I don't want to change the randomness factor for all the other jobs. I have ...
0
votes
0answers
46 views

How to know the which jobs are scheduled in cron for today

I am looking to get the details of jobs which are scheduled to run from cron for today and need to make it as a script by 12AM every day to get the job details that are scheduled for today and like ...
2
votes
2answers
81 views

change the name for root mails from cron

I have two servers that are synchronized with rsync, one is the failover server of the other, so they both have the same name. Now root mails that are sent to my other account are all named from root ...
3
votes
1answer
6k views

How to run a cron job to execute every minute?

I am trying to create a directory having timestamp in its in name in /home directory. I have created following cron job as root user. But it's not running. What's wrong I am doing? Following is my ...
5
votes
2answers
25k views

Cron job to delete files older than 3 days

I need to remove files older than 3 days with a cron job in 3 different directories. (these 3 directories are children of a parent directory /a/b/c/1 & /a/b/c/2 & /a/b/c/3) Can this be done ...
0
votes
0answers
7 views

Why does rbenv not get added to the path when bash -lc is called from a crontab job? [duplicate]

I'm trying to setup a cron job to back up a rails project using the whenever and backup gems. I have done a standard install of rbenv on Ubuntu to manage my rubies. In .bashrc export ...
0
votes
1answer
121 views

Shell script runs differently when schedulled with cron

I have a strange problem with my backup script. To begin with, this is the backup script: ########################################################### # CODE BEGINS HERE ...
5
votes
3answers
30k views

How to start a cron job without reboot?

I use a cron job to call offlineimap every 2 minutes: */2 * * * * /usr/bin/offlineimap > ~/Maildir/offlineimap.log 2>&1 I needed to kill the cron job to fix a problem. How can I then ...
1
vote
0answers
115 views

Maintain screen session when executing shell script on boot

Solved: I solved this problem by introducing a delay before executing the script: @reboot sleep 60; /root/start_server.sh On Ubuntu 14.04, I have a crontab entry set to run on reboot: @reboot ...
0
votes
1answer
50 views

Edited /etc/cron.d/anacron, changes are immediately in effect?

After editing /etc/cron.d/anacron and saving the file, are the changes immediately acknowledged by cron? Or do I need to run a command to tell cron to reload /etc/cron.d/anacron?
0
votes
1answer
72 views

Scope of shopt options in cron script

I have a bash script that is run nightly in a cron job. It needs to do case insensitive file matching, so the script calls shopt -s nocaseglob I want to make sure this does not affect other cron ...
1
vote
0answers
27 views

start xscreensaver from cron@reboot, ubuntu startup, service/deamon?

I need start xscreensaver for ubuntu, and it can be started in ubuntu startup application. my question is: can xscreensaver be started in cron@reboot? can xscreensaver be started in service/deamon? ...
1
vote
1answer
172 views

run btrfs balance with cron

Since I run today in a problem with a full disk, which turns out is not unbalanced. Which you can fix with btrfs balance. So my question is: Is there any risk by ruining this by a cron job? (in ...
0
votes
1answer
47 views

Can someone be so kind as to setup a cronjob for me? [closed]

I've been trying to get cron to execute these two scripts to schedule and post on twitter, tumblr, facebook and linkedin. It worked once and never again. <?php require ...
2
votes
2answers
163 views

Cron job not behaving as expected

So I have a python script that pulls down git/svn/p4 repositories and does some writing to a database. I'm simply trying to automate the running of this script and based from what I see in syslog it ...
33
votes
15answers
5k views

Run unix command precisely at very short intervals WITHOUT accumulating time lag over time

Question I'd like to be able to run a UNIX command precisely every second over a long time period. I need a solution, which does not lag behind after a certain time, because of the time the command ...
0
votes
1answer
188 views

crontab not executing my script?

I added this rule to the bottom of my crontab * * * * * /root/test.sh It basically resets iptables so I can fool around. If I mess up I won't be locked out of my box. When I run the script in bash ...
2
votes
2answers
142 views

Emulating /etc/cron.d/ on OSX

On most modern unixes, cron supports individual crontab files in /etc/cron.d, in which each task executes as a specified user. These files automatically update the crontab once edited. They allow ...
2
votes
1answer
808 views

Send backup by email with crontab

I use this cron job to do a backup of /home/blah/ each day at 01:00 a.m. : 0 1 * * * tar -zcf /home/blah/backup.tgz /home/blah/ In fact I would prefer that an email is sent to me with the .tgz file ...
23
votes
4answers
47k views

How do I completely silence a cronjob to /dev/null/?

On my Ubuntu-Desktop and on my debian-server I have a script which needs to be executed each minute (a script that calls the minute-tic of my space online browsergame). The problem is that on ...
1
vote
1answer
165 views

Are there disadvantages/consequences to adding scheduled tasks directly to /etc/crontab instead of using the crontab command? [duplicate]

CentOS 5.x I noticed that someone (presumably another admin) added an entry directly to the bottom of /etc/crontab so it reads like: SHELL=/bin/bash PATH=/sbin:/bin:/usr/sbin:/usr/bin MAILTO=root ...