Cron is used to execute scheduled commands. It acts as a task scheduler on Linux and UNIX systems which will execute commands at specified times set by the user. Cron has a great deal of customization and is often used on server environments where common tasks are run on a regular basis.

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226 views

Which tasks in “Scheduled Tasks” (gnome-schedule) use anacron versus cron?

I am trying to run a command once a day, but my machine is not always on. anacron says it's meant for such purposes, but I prefer to use the Gnome Scheduled Tasks GUI program. If I schedule a task to ...
2
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90 views

cron.daily gives apt error. “not found”

I recently upgrade to Ubuntu 15.04 and after that I get these strange errors in my cron e-mail. Sadly I didn't remember what version of ubuntu I was upgrading from but I think it was the latest before ...
2
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46 views

Crontab not running 24 hours

I've the following job in /etc/crontab: @hourly root /usr/bin/script Here is the script: #!/bin/bash killall tcpdump date=$(date +%G%m%d-%k%M) tcpdump -n port 5060 -w ...
2
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178 views

How to make speaking clock ( via cron and festival tts) work while playing music

I switched to linux since last 11 months,I am on ubuntu 15.04, I have learned to use cron for various tasks. I use Cron to announce time via festival tts(using mbrolla voice) hourly. This is the ...
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187 views

No crontab for user, yet cron jobs are running

I have no apparent crontab: $ contab -l no crontab for gauthier Yet, something seems to be running as my user: $ tail /var/log/syslog ... Apr 13 16:25:01 sobel CRON[22043]: (gauthier) CMD (rsync ...
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207 views

Tiger: `rtm` is listening on socket XXXX

On my Ubuntu serve 12.04 LTS, Tiger is reporting a lot of stuffs like this: OLD: --WARN-- [lin002i] The process `rtm' is listening on socket 60404 (UDP) on every interface. NEW: --WARN-- [lin002i] ...
2
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185 views

Need to setup email notification when system starts and shutdown

I would like to have the system send me a email notification everrytime the system starts or shuts down. I am currently running Ubuntu 12.10 I found this tutorial but I couldn't make it to work.
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914 views

Why doesn't duply work when set as a cron job?

I have a problem with a cron job which starts but doesn't complete. Running the command manually works fine. I already read the page about cron issues and solutions here on AskUbuntu, tried the ...
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237 views

Script not working through Cron - JDK version mismatch between shell and script

I am executing a script through cron using the below command: */10 * * * * cd /nas/app/someFolder/psox; ./RunPSOX.sh >> /tmp/trial.log 2>&1 This is being executed by root user. All ...
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34 views

crontab run sequentially

I have to run crontab in xvfb display mode forever when the system restarts...below is crontab code.... @reboot nohup Xvfb :1 -screen 0 1024x768x24 & export DISPLAY=":1" @reboot /usr/bin/forever ...
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45 views

Evernote: script that can incrementally download full db where note = file?

Is there any script to incrementally download my Evernote database in plaintext? I need to have not one big file but many files (with attachments) - I want to use cron for everyday backup to git and ...
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49 views

How can simulate mouse clicks in a cron job on a headless machine?

I have a headless machine running Ubuntu 14.04 LTS. I'd like to set up a cron job to daily click some buttons on a web page. I often use X2Go, and I know I could manually open an X session and use ...
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28 views

restarting custom kiosk service with cronjob

I have a google chrome kiosk set on top of Ubuntu Server 14.04.3. What I want to do is to restart the kiosk every day at midnight. As a test I set a cronjob to restart the kiosk every minute in order ...
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104 views

Cron not working but manually run in terminal works

I placed a command in a script file called app.sh that simply execute an application. sh app.sh When I run it with terminal directly works fine!! but when put it under cron does not work..I tired ...
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60 views

Cron job doesn't execute php file and normal file

I have two files, that needs to be executed every evening. PHP file contains the latest records from database, and creates a source file in same directory. And a normal file, even doesnt execute. I ...
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159 views

How to check if a cron job is running or not through php script?

Back to my question How to check if a cron job is running or not?, the answer there is valid which stated to redirect output to a file and test. 15 * * * * /usr/bin/php ...
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45 views

Accidentally enter “crontab” without -e

Now my root crontab is entirely blank. I enter some crone tasks into this blank crontab(I typed crontab -e again). Even though I see cron is running(pgrep cron returns a number), no cron job is ...
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34 views

How to interpret this code?

I setup a cronjob send me notification using notify-send. I tried several methods from different several site and then finally below code works. 55 * * * * eval "export $(egrep -z ...
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11 views

How to track the Internet connectivity of two PCs simultaneously using a script?

I have two PCs and I want to monitor the Internet connectivity in both of them and make it available in a page (not local, and something like example.com/statuses) as to whether they're currently ...
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32 views

Log rotate daily time for specific application

I know that similar question has been already asked, but there was something I am missing: Is there any option to specify the hour of rotating the logs, but only for one application ? I know that ...
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0answers
45 views

Screen in crontab

I'm trying to run 9 screens windows by crontab, and then, run some codes (basically the same for all of them), but they don't work. The code runs all of 9 screens, but run code only on the first. Aah, ...
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30 views

First-time backup landed in the wrong place

I used Backups with the following settings: Folders to save: Home(jeg) [ON] Folders to ignore: Trash, ~/Downloads [ON] Storage location: 799 GB Volume [ON] Folder: LinuxBackupDirectory [ON] ...
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106 views

Ubuntu shuts down unexpectedly, Every night

I know this sounds weird but unfortunately it's real. I have Ubuntu 14.04 LTS running on Dell Inspiron N5150 Laptop with intel i7 CPU and nvidia GeForce GPU. Every night between 9:30 pm and 11 pm ...
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73 views

Bleachbit cron problems

I've been trying to get gnome-schedule to automate bleachbit but the crons never work. So after trying a lot different things I decided to just try setting crons the normal way. I opened terminal and ...
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68 views

Turn thinkpad screen off and back on automatically via cron

I setup my thinkpad a while back with ubuntu 10.10 to work as a digital picture frame and each night turn off the screen with a cron cron command, then in the morning another cron command turns it ...
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65 views

Why ps produce different output when it is started from a cron job?

When I run ps -f -u $USER ($USER is ubuntu) this is the output I get. USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND ubuntu 23517 0.0 0.1 22244 4856 pts/5 Ss+ ...
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35 views

cron job to run google-musicmanager and have its indicator showing up in the menu bar

For some reasons, I need to periodically run a script with cron in order to start Google Music Manager (and to perform some music folders/files and config management stuff, which poses no problem). ...
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182 views

incron tab won't fire

I'm trying to get incrontab running, but it won't work. This is the error I get: access denied on ~/propt/apo/feeds - events will be discarded silently and this is the line in incrontab I want to ...
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149 views

CRON @reboot vncserver?

Is there any reason per-user cronjobs running vncserver @reboot wouldn't run? When I reboot the machine and look into /var/log/syslog, I see the jobs being run, then cron saying (CRON) info (No MTA ...
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141 views

Cron, xconf-query and Xubuntu 14.04

I have updated my Xubuntu to the 14.04 version. Unfortunately, I am experiencing a problem. I have a script, named earth, updating the wallpaper of my desktop. Here is the code #!/bin/sh nice -n 19 ...
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98 views

syslog time is not matching cron string setup

I am running many cronjobs in my server. When I was checking the syslog file to see the cron timing, it's completely not matching. Can someone help me to understand. syslog May 23 00:00:01 xxxxxx ...
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398 views

Allow user to run programs as root without password. Would it be the correct solution to my problem?

I have a server which I need to be running certain programs permanently; I'm having problems with two of them and I'm not sure if the solution I've found would be the correct one, so I ask for opinion ...
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42 views

Any reason why Ubuntu's man page on crontab(5) is less informative?

Why is the man page for crontab(5) at manpages.ubuntu.com less informative than corresponding man page at linux.die.net? Compare The "sixth" field (the rest of the line) specifies the command to ...
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64 views

Make CronTab not asking for id_rsa keyword when running in terminal

I like to do some git pull inside a script and see see output of it. So I made up this cronjob to test: DISPLAY=:0 * * * * * mike /usr/bin/gnome-terminal -x zsh -c "/var/www/up.sh; zsh" ...
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115 views

Using a NAS as a collective dump, with symlinks for whoever uploaded each file

I have a local machine that was sitting around & doing very little, so I decided to turn it into a NAS (Network Attached Storage) machine, with a 40GB disk for Ubuntu (13.10), a 160GB disk that's ...
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186 views

Why won't cron run my sh script?

Used gnome-schedule to create a script to set my headset as the fallback audio device because it keeps unsetting it when the headset gets disconnected or pc goes into sleep mode. Anyway, crontab is ...
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86 views

Backup regimen - is this plan any good?

I have a desktop that has some valuable personal and financial records, photos, etc. I installed a second drive formatted ext3 called 'internalbackup'. I've been using a variety of backup programs, ...
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131 views

Why are alerts still coming if a job is commented out in cron?

In cron entry I have disabled the ignite recovery tape backup. But still we are getting alerts as: The action /opt/osit/omniback/bin/check_make_recovery.pl failed Crontab entry : # Ignite ...
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261 views

How to trigger anacron start if USB drive connected

There is a script in /usr/lib/pm-utils/power.d/anacron which restarts anacron if leptops are connected to power. Is it possible to have a similar script restart anacron if (a certain) USB-drive is ...
0
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0answers
8 views

PHP session files are created very fast and are not deleted automatically

Platform: Linux Ubuntu 14.04 Main problems: PHP session files within /var/lib/php5 are never deleted New session files are constantly being created at a rapid speed The garbage collection is ...
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0answers
28 views

variable exported in sourced file not available

I have a script that contains the following: #!/bin/bash source $HOME/.bashrc echo "LD_LIBRARY_PATH=$LD_LIBRARY_PATH" This script is run on @reboot by cron, with output redirected to a log file. ...
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14 views

NFS Share Mount Issue

I have my main PC, and a server PC on my network. I don't always power on my server and this is causing an issue with my NFS share/mount. If I start my main PC and use it for a bit and then I decide ...
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0answers
18 views

Need some advice with a script for anacron

I made a bash script and I made it by using gedit as sudo. Let's call it "script.sh". Then I made the script executable. I've already tested it. It does run, but with sudo. Inside the script I didn't ...
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0answers
11 views

Timezone CRON issue

I wanted a CRON job on my server to run at 5 AM GMT every day, so that according to my timezone (IST), it'd send an email at 10:30 AM. Here's my date and timezone settings: ~# date Fri Jan 1 ...
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14 views

Automated backup script no longer running after upgrading to 14.04.3

I have a backup script that flawlessly backed up my system on an hourly basis, until I upgraded to Xubuntu 14.04 from Xununtu 12.04. I did not initially notice, since I just assumed it would keep ...
0
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0answers
61 views

What is Permission denied (publickey,gssapi-keyex,gssapi-with-mic)?

#!/bin/bash/expect for host in `cat jo.txt` do ssh -i /Users/Aparna/Desktop/Key/mfiosdev_rsa root@$host "timeout 4s curl -sL -w "%{http_code}\\n" "http://$host:9080/worklightconsole/" -o /dev/null -v ...
0
votes
0answers
11 views

Remind user of a backup task, for example once a week (Bonus: on shutdown)

I am looking for a kind of cron task that remindes (on my Xubuntu desktop) me once per week to do a backup (which is a rsnapshot shell script which should be started in a terminal to see the ...
0
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0answers
21 views

Cron Shutsdown MySQL every day

I'm not a sysadmin, but I run several VPS on my daily work most of all for WP sites. In one VPS (DigitalOcean) 2GB RAM / 2CPUs 40GB SSD Disk my MySQL dies after a Cron Job Runs, here are my Crontab. ...
0
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0answers
30 views

Cron job to set screen brightness not working in ubuntu 14.04

In the terminal, I ran: crontab -e Then I added the following cronjob in the file 26 21 * * * /usr/bin/xbacklight -set 80 This was supposed to set the brightness to 80% at 9:26 PM. But its not ...
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44 views

Editing Gsettings from Cron via script doesn't work

So, I'm trying to change my theme from a light to a dark version in the evening, and vica versa in the morning. However, Gsettings doesn't work from Cron, and the solutions posted here and here don't ...