Questions tagged [cron]
Cron is a job scheduler that allows users to run commands periodically.
1,831
questions
0
votes
1answer
37 views
crontab cannot find environment variable even after sourcing .bashrc
crontab -e
00 00 * * * /home/username/run.sh >> /home/username/log 2>&1
Inside run.sh:
source /home/username/.bashrc
java
When crontab job is triggered, I got this error in the log:
/...
0
votes
1answer
16 views
CentOS 7 cron jobs
/etc/crontab is empty yet cron jobs are still being run. scripts that are located in /etc/cron.hourly, /etc/cron.daily, etc. are still being run. So where is the master if it's not /etc/crontab? Is ...
1
vote
2answers
31 views
Cron task does not work
I am developing a backup script in my NAS running a docker container. Inside my container I have cron running with this /etc/crontab:
root@backups-nas:/code# cat /etc/crontab
SHELL=/bin/bash
PATH=/...
0
votes
1answer
38 views
Running a Python script using Crontab
I've written a python script which works well when I run it as python3 /path/to/file/Script.py, but once I try to run it through crontab it doesn't work as intended.
My script is supposed to download ...
1
vote
1answer
32 views
crontab.service file not found despite installed and configured crontab
I want to set up crontab every minute on Manjaro, so I've put some script every minute with:
$ crontab -e
* * * * * /path/to/my/script.sh
crontab: installing new crontab
Then I see it is installed
$...
0
votes
0answers
25 views
WSL Run Service at Start
I'm honestly not sure if this is an issue with WSL or I'm just doing something wrong for Ubuntu in general, but I cannot get the cron service to run at start on my WSL system.
It starts just fine ...
0
votes
1answer
46 views
How to redirect output to a log file from cron and prepend timestamp?
Most logs on my Mac have a time stamp before the output message like this:
Nov 14 17:55:24 - SoftRAID Driver: SoftRAID driver loaded, version 5.8.1.
I am running an executable in cron and instead of ...
2
votes
0answers
20 views
Shutdown from a script executed by cron as root
Background
I'm trying to write a script (see end of the question) that checks the temperature on Raspberry PI and shuts it down automatically if it goes too high. The script would be run by cron, ...
0
votes
1answer
27 views
how to schedule a task that runs a command or script when a user logs on?
I want to program a script that is launched whenever a specific user, let's call it user log in.
For example, when you log on to the computer with that user or using the su command on a terminal.
I ...
0
votes
1answer
38 views
Cron job: echo 3 > /proc/sys/vm/drop_caches not actualy being written to /proc/sys/vm/drop_caches
I have this script:
#!/bin/bash
# If the cache is greater than 5G, echo 3 > /proc/sys/vm/drop_caches
CACHE=`grep -w "Cached" /proc/meminfo | awk '{ print $2 }'`
if [[ $CACHE -gt 5000000 ]]
then
...
1
vote
1answer
49 views
How to remove cron task that deletes PHP sessions
It seems Linux Mint 19.3 Tricia Cinnamon wants to clear out PHP session files every half-hour.
How do I:
Remove this task from the scheduler's awareness, and
Not have to reboot the computer to do so....
2
votes
1answer
45 views
Crontab does not accept 2/6 on hour [duplicate]
This setting, for every six hours, works fine
0 */6 * * *
But this runs every six hours at 0:00, 6:00, 12:00 and 18:00
Now I want to run every six hours, but starting at 2:00. I read on this ...
0
votes
1answer
23 views
cron job setup using rpm is not working
I've below cron file
SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin
LOG_DIR=/var/log/myapp-services-cron
MYAPP_SERVICES_DIR=/opt/myorg/apps/myapp-services
* * ...
0
votes
1answer
37 views
Running a python script encapsulated in a bash function via cron
I have a python script that I've encapsulated in a bash function. I would like to be able to call this function as a cron job, but I cannot seem to get cron to execute it.
The function is as follows:
...
0
votes
0answers
21 views
Linux Heartbeat for cron and services
I have few vital scripts that run using cron and some other are services.
In past experiences we have broken those scripts by mistake and I was wondering if there is some sort of 'Heartbeat' that ...
0
votes
0answers
17 views
Is adding crontabs safe if it's done via a multithreadded application like a web server?
I'm using cronjobs to send email reminders to my clients. What happens is that when an email is first sent to a user, a reminder is scheduled at the same time by adding a cronjob for it using this ...
0
votes
0answers
16 views
Why does my cron job spawn multiple processes?
I'm fairly new at using cron jobs. I'm using Webmin to create the cron job as shown here
The actual command I'm running is
ffmpeg -y -i rtsp://xxx:xxx@xxx.org:8127/live -vframes 1 /var/www/html/...
2
votes
0answers
46 views
CentOS 7, cronjob for user does not run script
I have CentOS 7.6 on a virtual machine. there some bash script at /opt which i need to run them with this user dbuser. these scripts write their output in a folder. Using crontab -e I put these in ...
0
votes
0answers
36 views
Different versions of files in different hours
On my laptop, I have three files: file, file-morning and file-afternoon. I want file to be a copy of file-morning before 12AM and a copy of file-afternoon after 12AM. Ideally, I would like to be able ...
0
votes
1answer
31 views
Crontab doesn't find a word
sid="GR1"
if sapcontrol -prot PIPE -nr $sid -prot PIPE -function GetSystemInstanceList | grep 'GRAY' >> $LOGFILE
then
echo "STATE: SAP system is offline. (sapcontrol)" >> $...
0
votes
1answer
132 views
Crontab command missing in Fedora 31
Probably a ridiculously simple question, but I cannot find a thing on this online.
I am using vagrant boxes for several tests and in this particular case it is the Fedora 31 box from Bento with ...
0
votes
1answer
41 views
Cron create crontab as user, not as root
On Ubuntu I want to set up cron task to send email from my application. I think that I should run this crontab as user, not as root. Am I right? But I cannot go to the crontabs directory. I have ...
0
votes
1answer
46 views
Configuring cron from shell script
I have a shell script with the following lines (the full script at the end of post):
CRON_BCK_CMD=/home/user/bck.sh
CRON_CONF=" */30 * * * * $CRON_BCK_CMD"
but when I simply run these in ...
0
votes
0answers
81 views
How to restart Cinnamon after screen unlock
I have an issue with Cinnamon that manifests itself after a long idle period, when I use the computer after a few hours of idle, the CPU, memory, etc. all seem to be fine for Cinnamon, but every ...
0
votes
1answer
39 views
Executing hourly / weekly task with crontab
I want to execute a task using cron once per week or once per hour, but not starting until a given time.
If it was a daily task I would write simply this (after crontab -e).
00 07 * * * ...
0
votes
3answers
53 views
How to comment all the crontab entries and then uncomment same using a script
Just to be clear I want to comment crontab entries, not a basic file. Usually, I do it like
crontab -e
30 * * * * /u01/app/abccompny/scripts/GenerateAWRReport.pl
01,31 * * * * /u01/app/abccompny/...
0
votes
1answer
50 views
crontab -e doesnt shows option to select editor - what to do?
I'm using Linux Centos 7, as a non-root user. When I want to add cron job that is not possible, I enter
crontab -e
I don't have option to select editor or to add cron job, just have blue ~ signs??
...
0
votes
0answers
42 views
can't create your crontab file in the crontab directory
OS: Solaris 5.11
Until today, I was able to populate the crontab using:
crontab myjobs.dat
In fact, I have a shell script that executes this so that I can refresh crontab. I've also used echo > ...
0
votes
0answers
34 views
crontab modification is not permanent
I am a below avg linux users, so my question may be basic to most of you guys.
When I use crontab -e, the changes I do do no last. If I add a line, it is not there the next day. Perhaps there is a ...
0
votes
0answers
24 views
“Time Blocks” with Cron
I don't know the technical name for this but I am looking for the following behaviour:
Define a daily time block (e.g. 9am to 5pm) with an associated action
If this time block is entered while the ...
0
votes
1answer
210 views
cron automatically activated after some time
I am working on Ubuntu remote server. I deleted automatic cron jobs from my server, but it recovered automatically after some days and occupy my 50% CPU. I attached cron job file from my server here (...
1
vote
1answer
24 views
`systemctl hibernate` not executed on crontab script
I have a script that verifies the battery level using acpi and if it's below certain threshold it should lock the machine and hibernate. The script is executed every minute using crontab
The problem ...
-1
votes
2answers
68 views
When is /etc/crontab checked?
I read on cron man page:
Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; The found crontabs are loaded into the memory. Cron also searches ...
1
vote
1answer
70 views
Cron runs a non-existing variant of . sh script
I've been encountered a strange phenomena.
I've been messing with cron, so it runs a script called startup.sh, which it does.
I used the command sudo crontab -e and then entered the following:
@...
0
votes
3answers
56 views
Search string and add # to the beginning of that line
Need some help using the vi editor.
I am trying to comment out a line on crontab for a specific user.
This is the line on the crontab among many other lines:
0,5,10,15,20,25,30,35,40,45,50,55 2-...
0
votes
1answer
42 views
Is it possible to run crontab when a button on my custom website is triggered
I want to make many tasks(different shell script) run with crontab by clicking on a button on website to start all tasks specified in crontab. Is it possible to do this? Please provide me the ...
1
vote
0answers
71 views
Script will run in root terminal but not when run as a cronjob as a user
The cron job:
51 18 * * * /home/XXXXXX/public_html/wp-content/uploads/wpallimport/files/wpai_scripts/ld_wpai_script 2>> /home/XXXXXX/public_html/wp-content/uploads/wpallimport/files/...
0
votes
3answers
64 views
echoing Command to cron.d
I am trying to append/echo a command to cron.d. However, when running the script that echoes the command:
echo */2 * * * * /usr/bin/aws ssm-send-command --document-name "AWS-RunShellScript" --...
0
votes
1answer
115 views
What is the different use case of cronie, cronie-noanacron, cronie-anacron?
Today (in 2020, with init systemd), there seem to be many ways to schedule tasks (something I assume previously made by the crond daemon).
My trouble is to understand why there are three packages ...
0
votes
0answers
34 views
Linux: OpenSuse: Cron/Postfix: Change sender name with MAILFROM
when I get output from a cron job on OpenSuse, it has always this format in "From" Header:
"(Cron Daemon)" <user@hostname.domain>
I figured out how to change the "user" and the "hostname....
1
vote
0answers
69 views
Cron jobs not running on Kubernetes + Alpine linux
I am trying to run a cron job on Alpine Linux docker image which is then pushed in Kubernetes container. The Cron job is that I want the container to restart itself after every 15 mins. So my command ...
0
votes
1answer
172 views
What is the best practice of running cron job in a docker container
My application is a Python Django running on a docker container.This application has a cron job that keeps updating the data in a database. Should I put this cron job into a separate container because ...
0
votes
1answer
36 views
What is the $PATH given to cron jobs? [duplicate]
I have a process that runs on a @reboot cron job. The process needs to run an executable file. I have noticed that I have to put the executable in /usr/bin/. I can't just put it in a folder in my $...
1
vote
1answer
81 views
Cronjobs not running. Cron daemon not working
First of all, the server specs:
VPS - OpenVZ,
Ubuntu 14,
Kernel 3.10
Now, it appears that the cron daemon is not running ANY crojobs at all and i cannot find out why.
I tried:
Rebooting the server....
0
votes
1answer
48 views
Cannot logrotate hourly by cron
I have the following entry in /etc/crontab
47 * * * * root /usr/sbin/logrotate -v -f /etc/logrotate.d/mariadb_dumps &> /tmp/errrot
The line is run because the /tmp/errrot if created (empty), ...
-1
votes
1answer
51 views
openSUSE: “Permission denied” error on Cron log file
using: openSUSE Leap 42.2
/etc/cron.d/mysite file content:
* * * * * wwwrun /usr/bin/php /srv/www/mysite/cron.php >> /var/log/apache2/mysite.cron 2>&1
/etc/cron.d/ dir content:
/etc/...
0
votes
1answer
75 views
Unable to send notifications from cron job
I'm trying to use a cron job to see when the battery gets lower than a given threshold, and then to send a battery critical notification. However, when I make the cron job execute a script every ...
0
votes
0answers
33 views
How can I schedule a nightly reboot?
I'm having some periodic issues running a particular application.
I know a scheduled reboot is NOT the answer but until I can figure out the problem I need to schedule a reboot each morning.
Any ...
0
votes
1answer
132 views
cron not running in Ubuntu 18.04.3 LTS
I have created downloads file inside /etc/cron.d/ directory.
Following is the content of the downloads file.
* * * * * root /usr/bin/python3 /path/python.py
File permissions and owner:
-rw-r--r-- ...
1
vote
0answers
71 views
Comfortable way to keep Debian Buster up to date?
So far I have only used Debian (and other Linux distributions based on Debian) for testing purposes and on non-productive systems. On these systems, I occasionally carried out updates manually via the ...
