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

learn more… | top users | synonyms (1)

1
vote
1answer
35 views

What are the filesystem permissions for a cron job?

I'm working on a production server. It has some daily cron jobs, and here's the filesystem permissions on them: cron.daily$ ls -Al total 24 -rwxr-xr-x 1 root root 332 Dec 3 10:33 0yum-daily.cron ...
5
votes
2answers
21k views

What are the runtime permissions of a cron job?

When a cron job runs with what privilege does it execute? I'm not sure about that. Is it with the same privileges of the user that added it via crontab -e?
0
votes
1answer
33 views

When do cron tasks begin to execute?

Having read through the Wikipedia page on cron, it is unclear to me when cron begins to execute the tasks I have defined in the crontab file. Is it during the boot process - or even at the end of it - ...
-1
votes
0answers
33 views

Cron command is running but not actually executing

I'm on a new server and having issues getting crons to run under cron.d Here is the content of /etc/cron.d/mytest: MAILTO="" SHELL=/bin/bash */1 * * * * root sudo /usr/bin/php ...
0
votes
1answer
32 views

Why is crontab executing on one server but not the other?

I have two servers on linode that have some websites on them. I created a script to see if mysql is running on the server and if it's not running then the script will start mysql. The script is on ...
2
votes
1answer
677 views

Permission denied when running logrotate with anacron

I am trying to figure out what is causing anacron to send me the following error message: /etc/cron.daily/logrotate: /var/log/mariadb/mariadb.log-20140710.gz: Permission denied error: error running ...
1
vote
3answers
1k views

No syntax highlighting when editing crontab

I am trying to figure out why I don't have syntax highlighting when editing my crontab. I have both $EDITOR and $VISUAL set to /usr/bin/vim: > echo $EDITOR /usr/bin/vim > echo $VISUAL ...
2
votes
1answer
1k views

fstab mount, boot stuck on “A start job is running for dev-disk-by\…”

I am running debian 8.1 and working on this for hours now! I try to auto mount seagate and medion on boot if they are plugged in, but if the server is booting without one of these LABELs it stucks ...
0
votes
2answers
32 views

Is it safe to allow users to use cron to schedule tasks? [closed]

If a user is granted permission to schedule cron jobs, i.e. by being listed in cron.allow, does this make them any more of a "threat" to the system than a user without that permission? In my case I ...
2
votes
3answers
22k views

Globally change path for all users, even in cron

We're setting up an SGE cluster with CentOS 6. My sysadmin is installing applications that are not installed via RPM (i.e. via other means like make install) should go in a non-standard directory, in ...
1
vote
0answers
43 views

php curl script working in cli but not on crontab [closed]

I have set the following on crontab */1 * * * * /opt/php-5.3/bin/php -f /var/httpd/appliance/appliance/docs/vip_dashboard_script.php >> /tmp/vip.log 2>&1 the contents of my script. ...
22
votes
3answers
86k views

crontab's @reboot only works for root?

man 5 crontab is pretty clear on how to use crontab to run a script on boot: These special time specification "nicknames" are supported, which replace the 5 initial time and date fields, and ...
1
vote
1answer
51 views

Cronjob running but no crontab for user?

I'm having troubles with my crontable on the scientific cluster I'm using. It's a bit peculiar, since the jobs seem to run (I get regular mails from some updates) but when I type crontab -l the ...
2
votes
2answers
2k 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 ...
-2
votes
3answers
48 views

linux crontab + how to set crontab at 23:00

please advice how to set the crontab in linux to run a task each day at 23:00 at night and if someone know a shell script that we can run in the linux that can help us to set acrontab syntax
1
vote
1answer
50 views

Crontab resetting itself

I have a computer with Ubuntu server 15.10 installed on it that sits in the same room I am in. I use it just as a Minecraft server, map renderer and whatever else php scripts I want to run scheduled ...
1
vote
1answer
27 views

Crontab Line Date

I'm getting ready to launch a crontab, but since I'm new at it, wanted to check with someone if they could verify that what I'm doing is correct. * 3 * * 5 /usr/local/bin/backup.bash The above ...
1
vote
2answers
54 views

How can I start program on boot in Ubuntu 14.04?

Is the root crontab the only way? I'm starting up a MC server and don't want it to need me to manually restart it each time the server reboots for whatever reason. I don't want any login required ...
0
votes
2answers
51 views

Execute a shell script via crontab

Currently I got stuck by trying to execute a shell script via crontab. It does not work and I can't figure out what is wrong here. What I want to do is: Execute a javascript (index.js) file with ...
0
votes
3answers
189 views

How to automaticly open a URL at specific times each day

I am using kubuntu 14.04. I have installed cron using sudo apt-get install cron, and then I created this file in IDLE, called openurl.py. #!/usr/bin/env python import webbrowser ...
1
vote
2answers
4k views

Run gui application on startup

I can run a script at boot by adding the following line to my crontab: @reboot perl /path/script That works fine. But the problem arises when I try to run a gui application such as gmail notify. It ...
4
votes
4answers
2k views

nginx logrotate error on cron job

I'm running Ubuntu 14.04 LTS and nginx on a Digital Ocean VPS and occasionally receive these emails about a failed cron job: Subject Cron test -x /usr/sbin/anacron || ( cd / && run-parts ...
1
vote
2answers
23 views

why /etc/cron.hourly/myjob not working?

In /etc/cron.hourly, there is one file: -rwxr-xr-x 1 root root 117 Mar 8 20:33 myjob myjob: 3,18,33,48 * * * * /usr/bin/python /home/me/src/myproject/src/manage.py myjobs > /home/me/log ...
0
votes
2answers
63 views

Edit crontab without SSH access [closed]

I have Debian VPS and I gave FTP access to somebody, say John. I don't want to give John SSH access, but he needs to put tasks into crontab. What are my possible variants?
1
vote
1answer
3k views

Null message body; hope that's ok

I have the following command below as part of a cronjob. When I run the command via cron or at the command line, I get Null message body; hope that's ok. The contents of the email are empty but when ...
0
votes
1answer
32 views

AIDE is taking forever to initialize

I have a server at home that I use as a NAS and some other services. The server has Debian Jessie on it, with 4x 4 TB harddrives in RAID5. I use this server to store all my home data, movies, games, ...
1
vote
2answers
30 views

Shell script says system when to execute for the next time

I've got a shell script. It is supposed to be executed automatically on and on over time. Maybe about three times a day. But I don't want to write a cron job for it since it's not the same time every ...
0
votes
0answers
24 views

Incron IN_MODIFY and IN_WRITE_CLOSE strange behavior

If i set incron to listen folder for IN_MODIFY my script launch twice. If i set IN_WRITE_CLOSE script launch when file open and file close with write. Why? script: echo `date` ...
0
votes
1answer
48 views

Output of cron to file

I have a text file topcommand.txt which has a command as below: * * * * * /usr/bin/top -c | grep 'some process name' >> /home/abcd/topout.txt When I invoke this using crontab ...
3
votes
1answer
24 views

How would you build a cron that empties the mail in all mailboxes?

I am new to Unix here. We have some mailboxes that are taking up an incredible amount of space and I'm trying to figure out a way to delete all mail that has been in the box for 30 days. Most of what ...
3
votes
2answers
68 views

Crontab shell script git pull and forever start

I'm trying to set up a Raspberry Pi to check a repo on startup and then fire up a node script with forever. I got the second part working, but I tried a dozen git commands with no success. Here is ...
1
vote
1answer
41 views

CentOs 7 CronTab set JAVA_HOME

With the root user I configured the JAVA_HOME variable for crontab like this: [root@localhost ~]# vim /etc/crontab _______ SHELL=/bin/bash PATH=/sbin:/bin:/usr/sbin:/usr/bin:/opt/jdk1.8.0_71/bin ...
0
votes
0answers
11 views

Is an automating apt-get update+upgrade unreliable or dangerous? [duplicate]

I use currently for updating my system a manual apt update && apt upgrade, usually sometime after my system has started. Unfortunately, sometimes I run that really late or even forget it. I ...
1
vote
0answers
31 views

Program/script to limit cronjob output

Short version: Is there an off-the-shelf program to avoid being pinged repeatedly be frequent cron jobs in periods when they fail? I have a custom implementation but it seems like something someone ...
1
vote
0answers
36 views

Linux password expiring and cron jobs failing

I have jobs running on a server which I access via powerbroker (so don't know the password). However the password of the user account expired recently and the said jobs failed. Due to password ...
0
votes
1answer
50 views

Debian : Cron job not firing

I have a cron-job, which is just a script, clearing directories, which accumulate files over time. Unfortunately, it is not firing. Any idea why. I have created the cron-job using cronmaker.com. How ...
0
votes
1answer
18 views

Storing PHP output issued by crontab

I have a PHP file that is suppose to send one email per day scheduled by crontab. Here is my crontab: 45 23 * * * php /var/www/html/linus/class/runnable/dailyStaffReport.php I noticed that it's not ...
6
votes
4answers
26k views

How do I add an entry to my crontab?

I am using crontab for the first time. Want to write a few very simple test cron tasks, and run them. $crontab * * * * * echo "Hi" doesn't produce anything. crontab */1 * * * * echo "hi" says ...
1
vote
2answers
26 views

Whats the difference between adding scripts in the /etc/cron.daily/ or editing in your script in crontab(-e)?

There are multiple options - with cron - to start your script at a specific time, but, is one more secure over the other? My question is simple: Whats the difference between adding scripts in ...
0
votes
0answers
37 views

Junk Material on root crontab

I am investigating unexpected restart issue on my Oracle Unbreakable 6.5 and found some unexpected results on crontab for root users. I know that these are junk entries that my be cause to reboot ...
2
votes
2answers
85 views

How to setup an invisible cron job?

Is there a way to schedule a task using crontab by root user but should not be visible using crontab command i.e, crontab -l either for root user or normal users?
0
votes
0answers
13 views

How to stop gnome-schedule from sending mails?

I use gnome-schedule in a permanent running UI session on Debian 7.9 Wheezy/Gnome 3.4.2.1. For each run, I get a mail into the local mailbox of the corresponding user, telling Launching ...
6
votes
2answers
9k views

Location of the crontab file

as many (most?) others, I edit my crontab via crontab -e, where I keep all routine operations such as incremental backup, ntpdate, various rsync operations, as well as making my desktop background ...
0
votes
1answer
31 views

How to run a shell script using cron and at

I was trying to learn about crontab. I tried to execute shell script using crontab. But I did not get the expected result. When I use crontab, 38 17 * * * bin/sh sh /home/agalya/unix/digiclock.sh I ...
2
votes
1answer
42 views

Crontab: variables in the date/time fields

When to run my scripts that go run reports can vary within the month as the data is not available at a standard time; sometimes on the 8th, sometimes on the 10th, etc. I have many reports to execute ...
0
votes
1answer
47 views

Sudo cron job using arp-scan gives empty output

I made a script called hello.sh and it contains the following: #!/bin/bash printf "$( arp-scan --interface=eth0 --localnet )\n" printf "test\n" after making it executable (chmod o+x) and running ...
0
votes
0answers
17 views

Logging memory issues with Cron

I'm trying to log memory errors/issues using cron, however I'm still unsure how to do this. I'm new to cron, but I entered our system with it already using the tool. We've been having memory issues ...
1
vote
4answers
3k views

Cronjob doesn't execute shell script, but when I am executing it standalone it works. Why?

Shell Type: >echo $SHELL /bin/ksh Cronjob : 15 * * * * /bin/ksh /wls_domains/resMGT/logs/bea/wlr3queuetransaction.sh > /wls_domains/resMGT/logs/bea/data/script.log The script is as below: ...
0
votes
2answers
43 views

Allow null password for file transfer from Sunsolaris machine to linux mchine?

I m trying to pull a file from a Solaris server to my Linux server and I did it successfully by using scp.I want to run this below command as a cronjob, How can I save password for this automation ...
1
vote
2answers
37 views

Allow one entry at a time in incron job?

I have a directory to monitor. When it is updated, I run some command via incron. When multiple files are copied in this directory, incron execute multiple commands at the same time. Is there any way ...