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

learn more… | top users | synonyms (1)

3
votes
0answers
88 views

How do I schedule a cron task to run

I'm looking to crontab a script every hour starting Friday at 5pm... ending Monday at 5am. This script checks if it's completed this week and if it's currently running. If no/no, start task. Off the ...
2
votes
0answers
56 views

use find command in bash file

I am using this script in my Linux machine to find all files that were modified yesterday: #!/bin/bash find /home/*/domains/*/public_html/ -name "*.php" -mtime -1 | while read line; do echo "$line" ...
2
votes
0answers
64 views

running cron on a chroot

For my web development I use a debootstrap'ped Debian with sysvinit, I start apache2/mysql manually only when I need to work. Now for a new project I require to run some scheduled task for which I ...
2
votes
0answers
35 views

Why a crond can start late randomly

I have this issue of a cron that executes a PHP script at minute 20 every hour, This script generates a small number of reports based on data from a MySql database. Generally this script ends ...
2
votes
0answers
129 views

How to overcome this error when running a script in crontab?

This is basically my script. #!/bin/sh #set -x ...
2
votes
0answers
36 views

How do I process new additions to logs

I know that I can use a few tools like tail and less to view the newest additions to a growing log file. What I want to do, though, is run some sort of script at regular intervals (like cron) on the ...
2
votes
0answers
64 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) ...
2
votes
0answers
128 views

Configure job to expire

I'm learning Linux at the moment and were doing some exercises scheduling jobs with cron and crontab, but I'm wondering if it's possible to limit the amount of times that the scheduled job is ran. ...
2
votes
0answers
591 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 ...
2
votes
0answers
1k views

`crontab -e` sometimes fails with “Creation of temporary crontab file failed”

From time to time crontab -e fails on me on a Ubuntu box. It is the same for all users including the root and crontab -eu <user> under the root. Goes like this on a regular basis, a success here ...
2
votes
0answers
165 views

Fetching all Git repositories in the background

I'm thinking about setting up a cronjob for fetching all my repositories every once in a while, to have the current status ready in case I'm offline. Something like the following (wrapped for better ...
2
votes
0answers
211 views

Use dedicated per-user log file for cron and?

On Ubuntu 12.04 how can I configure cron to log to a particular file when it runs jobs as a particular user? I am interested in redirecting both the messages that go into auth.log and those going into ...
2
votes
0answers
953 views

Cron file syntax checker/validator script

Does anyone know a script (bash, perl, php ...) to validate the syntax of crontab files? I found this http://www.intuitive.com/wicked/showscript.cgi?053-verifycron.sh but just Vixie cron notation is ...
1
vote
0answers
8 views

Getting Busybox Cron to work on Qemu ARM VM

I created a .sh script, then tried crontab -e and entered * * * * * /etc/cronscript.sh, then tried to start it by typing crond. It looks like its trying to do something once per minute, but not my ...
1
vote
0answers
9 views

Crontab -e @reboot script doesn't start on restart

I add a string to crontab -e @reboot /home/user/start-ethminer.sh > /home/user/start-ethminer.log 2>&1 My /home/user/start-ethminer.sh file has the following content: #!/bin/sh screen -m ...
1
vote
0answers
67 views

Problem using crontab playing beep sound

I'm trying to create something like a watch does. The beep sound indicating that an hour has been passed. So I opened the crontab(sudo crontab -e) and wrote this line(there are five asterisks just ...
1
vote
0answers
37 views

Change events order in bash script that writes to crontab

Coming from the solution on this post I have made a few changes to the original script but output is not like it should be. Below is the script as I have right now: #!/bin/bash add=$1 ...
1
vote
0answers
35 views

How to override email address used by at command

cron has MAILTO setting to explicitly configure the email address that will receive the report Does at have anything of the kind? Man page says it will send using /usr/sbin/sendmail but which ...
1
vote
0answers
40 views

Send email on every change of service status

I am running a Debian server and i have setup mailutils to send an email from command line from root@localhost to an external email. I would like to slightly modify it, so it can send emails on every ...
1
vote
0answers
172 views

'nc' using ~100% CPU when transferring a FIFO file

On the server which is always connected I’m using this in a crontab: @reboot nc -k -l 1337 < /tmp/fifo.fifo On the client which is not always on the network or switched on I’m using this ...
1
vote
0answers
104 views

What does CRON=1 do?

What does setting CRON=1 do when set in front of a command? CRON=1 ./foobar.sh I suspect that the cron environment variable does something for printing to standard out. But I can't find anything ...
1
vote
0answers
260 views

init.d script ignored in yocto based distro

I'm modifying an embedded distro that is built using the yocto project. I need to add cron to it and have the cron daemon start on startup. I have created the symlink /etc/rc5.d/S98cronstart that ...
1
vote
0answers
82 views

Cron job running at 12.00 AM despite changing its time

I have only one cron configured in cPanel for WHMCS to run once per day at 12.00 AM. The cron sends daily activity logs to my email. A problem came up recently in which cron job activity logs sent ...
1
vote
0answers
45 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
0answers
86 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
0answers
134 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. ...
1
vote
0answers
60 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 ...
1
vote
0answers
35 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
0answers
383 views

Cron job scheduled to run on specific day-of-week is running on last day of month as well

I have a cron job scheduled to run every Thursday at 6am via the following schedule: 0 6 * * 4 It's been running as expected, but on Tues, September 30th it ran (unexpectedly) and again on ...
1
vote
0answers
160 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 ...
1
vote
0answers
530 views

systemctl to start cron-like job

In /etc/systemd/system directory I have: rsnapshot-backup.service file, with following content: [Unit] Description=rsnapshot backup automation [cron like] [Service] Nice=19 IOSchedulingClass=2 ...
1
vote
0answers
165 views

Cron job running but not establishing tunnel

I have a script which establishes a reverse tunnel on an endpoint HostB. It looks like this: cat tun.sh #!/usr/bin/env bash # Test code /usr/bin/ssh -V 1> /home/userA/bin/tun.stdout 2> ...
1
vote
0answers
253 views

Incrontab does not execute command

When I use incrontab out of the box, I mean no changes, I get no result, as if the command was not executed. my incron line is : /crrae IN_CREATE,IN_CLOSE_WRITE,IN_MOVED_TO /usr/bin/unix2dos $# the ...
1
vote
0answers
31 views

How to block the user for a certain amount of time

Suppose, I am working in X environment, and I want to have an obligatory periodic rest. Is it possible to setup a root cron job, that will block my user for 5 minutes every 45 minutes? I am using ...
1
vote
0answers
5k views

Trying to kill cron job processes found by “ps ax | grep keyword” logged in as pi user

I'm trying to kill several processes from the command line logged into the pi as the user pi. All of the processes have been started by cronjobs, so they should belong to the root user. I'm running ...
1
vote
0answers
110 views

Create a fake read only device like file with incrond

I need to generate UUID with uuidgen (not through any function call, but external command, because processes which will read the file cannot call any APIs or external commands directly). My idea is ...
1
vote
0answers
55 views

Unplug AC causes anacron to stop. No resumumption if cron.daily had already started?

Anacron is started/stopped by a number of means, one of which is when AC power is plugged/unplugged, as can be seen by examining /etc/apm/event.d/anacron and /usr/lib/pm-utils/power.d/anacron. You can ...
1
vote
0answers
1k views

wget command not working in cronjob

here is my command : wget -c -O /home/alireza/Desktop/1.mkv http://mysite.com/myfile and here is my /etc/crontab file : SHELL=/bin/bash PATH=/sbin:/bin:/usr/sbin:/usr/bin MAILTO=root HOME=/ 0 2 ...
1
vote
0answers
129 views

Scheduling cronjobs at specified time

I have scheduled some jobs in crontab which are to be run one by one, at some specific time. My script for crontab is : 15 10 * * * /Users/sri/files/BatchFF.sh 45 11 * * * /Users/sri/files/BatchGC.sh ...
1
vote
0answers
161 views

External HDD read/write permission changing from a cron job

So, I run an overnight python script that runs a backup of our web data in the /var/www directory, then moves the backups to an external HDD in /media. The script in scheduled in the sudo crontab ...
0
votes
0answers
15 views

Setting anacron on mac

I set cron to run script every day using env EDITOR=nano crontab -e where I wrote something like this @daily path/to/sript.script Now I want to use anacron to be sure that script is going to be run ...
0
votes
0answers
34 views

Pg_dump does not work in Cron

I have the command below and run it succesfully: /usr/lib/postgresql/9.1/bin/pg_dump -U dspace --format=c --file=/dspacebkp/dspace_db_$(/bin/date +\%m\%d\%Y)_uncompressed dspace I can see my new ...
0
votes
0answers
39 views

Cronjob python script

I have a python script that parses some html and then writes it to output file. I want that cronjob would execute that python script. When I run this script from command line it works fine (python ...
0
votes
0answers
44 views

Centos7 crontab @reboot sleep not working

I am currently trying to get my server to relaunch a few things on server reboot but they were failing due to screen not yet being loaded (I believe), in an attempt to fix this I added a 3min sleep to ...
0
votes
0answers
31 views

ubuntu Crontab not running properly

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 ...
0
votes
0answers
18 views

dstat not installed with cron

I have an auto install bash script triggered by cron, when some condition is met, the install process is triggered. It essentially looks like this: #!/bin/bash if [[ -f "/usr/bin/apt-get" ]]; then ...
0
votes
0answers
57 views

Issues with a cron script

I have a shell script which does following: Do a scan on websites (URLS coming from all_hosts.txt), Get json reponse which is saved in file (outputscanner.txt) Run a json parser (jq) on above file ...
0
votes
0answers
35 views

cron not running rsync

I'm trying to setup a rsync task using cron. The point is to sync a work folder on a linux partition and its counterpart on a windows partition on a dual-boot computer. To do that, I'm trying to ...
0
votes
0answers
30 views

How to view processId of process running in WINE

I'm looking to run some Windows Apps on Linux using Wine. However I need a way to check they are running (and haven't crashed). On Windows I use a Powershell script to check the relevant Windows ...
0
votes
0answers
21 views

Rebooting Ubuntu if necessary

My Ubuntu needs sometimes rebooting if it has downloaded upgrades. Can I automate it like do reboot if it is required and there is no unsaved works and I'm sleeping (say for example 3 am)?