Questions tagged [cron]

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

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How to extract timing info from crontab?

I have a crontab entry and would like to extract timing info from it. The goal is to know the frequency of bash script execution which will be executed by crontab. This info will be used for further ...
Preeti 's user avatar
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clamtk does not redirect stdout for its cron job

I have noticed that clamtk only redirects stderr to /dev/null and not stdout. if I change the cronjob it creates to also redirect stdout, will that effect the log file it creates? I want to use the ...
stacking and exchanging woohoo's user avatar
2 votes
1 answer
184 views

Using HOME variable in crontab result in broken jobs

I have this crontab file with a lot (100+) of jobs that execute some commands in the same directory, suppose ~/Documents/. Instead of cd ~/Documents/ && <command> for every jobs, I can ...
LinkOut's user avatar
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Debian 11 (bullseye): user cron jobs not running

I have a server that I am hosting at home using a residential ISP that issues public IP addresses via DHCP--that is to say, I don't always get the same IP back when my DCHP lease renews. I created a ...
jasonbourne's user avatar
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190 views

Cron expression at 11h30 and 19h every day

I would like to make a cron expression that runs at 11:30 a.m. and 7 p.m. every day. But 0 30 11,19 ? * * * runs at 11h30 and 19h30 And 0 30,0 11,19 ? * * * runs at 11h, 11h30, 19h and 19h30 How can I ...
Chrys's user avatar
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565 views

Cron schedule on last 2 days of 1st and 3rd week of every month

Can I get help composing a cron schedule? The schedule is supposed to run a command at the following times: last 2 days of 1st week of every month last 2 days of 3rd week of every month
Tahir's user avatar
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Wake up / CRON on Mac

I have an old iMac running macOS Catalina. I've scheduled 2 CRON jobs, one running in the morning (say, 8am) and one running in the afternoon (say, 5pm). The CRON jobs run a few R scripts, in case ...
PMaier's user avatar
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Crontab only recording partial output

I've set up a cron task to run my script called outcam.sh. This script opens a camera, prints "Program launched" and records a .dat file for every frame. It will also output a line of text ...
Paul's user avatar
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File is not readable when script is called by cron

This really has me scratching my head. I have a PERL script on a RHEL 7 server that creates an xlsx file via MIME::Lite and emails it to several people. If I run the script from the command line it ...
Chanel's user avatar
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How does cron know what MTA to use?

How does cron know what MTA to use? Where is this info stored please? (Using Ubuntu KK.) Edit: Here's the whole story: I enabled the MAILTO option in crontab, and scheduled some task. When the task ...
Aqualung's user avatar
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Cron not firing properly

I have a cron job that is supposed to execute a bash script. I have confirmed the bash script does work as the cron job works properly on my local machine. However the cron job does not appear to be ...
aidan vickars's user avatar
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492 views

How to exit "wall" without pressing Ctrl+D? [closed]

I'm using crontab to send messages to all users. I wrote */1 * * * * wall $(bash some_shell_script.sh) But the problem is I always have to press Ctrl+D to end the message. How can I solve this??
KimJunseo's user avatar
1 vote
1 answer
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nmcli Error: Connection activation failed: Not authorized to control networking

I wrote a combination .sh and .exp scripts that: activate vpn connection connect to remote server download some files from server deactivate vpn connection This scripts should run on schedule. I use ...
maskalev's user avatar
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Unable to uncomment just the cron by matching the string MYAPP

Below is my existing cron which i wish to enable crontab -l ####Cron to auto restart MYAPP ###*/15 * * * * ansible-playbook /web/playbooks/detectMYAPP/va_action.yml | tee -a /web/playbooks/...
Ashar's user avatar
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what is the syntax of jobs.deny?

from man it said The execution of files can be allowed or denied by creating file jobs.allow or jobs.deny which worked similar as other allow/deny config files But the example has something like ...
Wang's user avatar
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Trouble with starting emacs daemon using crontab's @reboot

I'm trying to configure my system to start emacs -daemon when I start the system. So, I've added following line to my crontab. @reboot /usr/bin/emacs -daemon And then when I start my system, It seems ...
Garid Z.'s user avatar
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Backup fails when sudo runs rclone during an anacron job

I have created a simple backup script that creates .tar.gz of all my important folders and upload it to Google Drive using rclone. Everything works perfectly fine when I run the script manually. But ...
pvs's user avatar
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how to NOT show syslog info messages on terminal TTY

I have a home media server in the kitchen (OMV / Debian). I have one physical terminal open - display and keyboard running musikcube player that shows browses and plays the music library. Looks very ...
r0berts's user avatar
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How to turn off crontab logging on Linux Mint 21

Every minute I was running my rather silly shell script to ensure my CPU governor is set to powersave. It was an experiment, for the lack of a better word. I forgot about it,... until now when I saw ...
Vlastimil Burián's user avatar
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RHEL7 Cron entry gives ambiguous redirect error? [duplicate]

We have a crontab entry that ends up sending an ambiguous redirect error. Pretty sure it's the command to read the date, but don't know how to fix. Are there other solutions? /bin/sh redirects to /bin/...
CGCampbell's user avatar
-1 votes
3 answers
645 views

How can I use $(pwd) in a bash script run via crontab?

I have a script named Run_at_startup.sh, which contains the following line: /bin/bash "$(pwd)/Testing_3.sh" If I manually run Run_at_startup.sh, Testing_3.sh will be run properly. However, ...
Matthew Wai's user avatar
1 vote
2 answers
407 views

How to start a screen with crontab

sudo Crontab -e 15 0 * * 1-5 /usr/bin/screen -S wake_up -d -m /home/pi/auto/wake_up.py But at 00:15 there is no screen started... This command: (worked in terminal) screen -S wake_up -d -m /home/pi/...
JOC0N's user avatar
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Crontab Enhancement [closed]

I have 31 cronjobs in a crontab and I changed the dates every week after first 7 cronjobs is done. Is there an alternative to reduce this manual work? I tried to set specific dates for each cronjob. ...
Basil's user avatar
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Error when installing package "crontab" on Beaglebone Black (Debian Buster)

I am working on a project regarding autorunning a pythonscript on boot, on a Beaglebone Black Rev. C, running BeagleBoard.org Debian Buster IoT Image 2020-04-06. I am trying to follow the first part ...
EnTekker's user avatar
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1 answer
192 views

crontab arguments

I understand that crontab -e is used to edit the current crontab. If i create a file named abc and put a cron command in it and type crontab abc, I believe this is to set the current cron file to the ...
Wallis's user avatar
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296 views

Command runs manually successfully, but fails quietly in cronjob

I'm running this as a cron job: ( export PATH='/usr/bin:/bin' && echo "$PATH" && wget "https://www.mahmansystems.com.au/WSDataFeed.asmx/DownLoad?CustomerCode=%2F&...
ptrcao's user avatar
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Log the error for a whole && chain of commands (in Cron jobs)

In one of my cronjobs, I have a long &&-chained command, at the end of which, I put 2>>/home/myparadise/public_html/wp-content/uploads/import/files/raytheon/raytheon_log_error.txt - ...
ptrcao's user avatar
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Pipe command output from a CRONTAB job deleting files more that 5 days old [closed]

I would like to run a CRONTAB job to delete files older than 5 days in a folder AND pipe the command output to a file in case of errors. This command deletes the files when run from a command line: /...
RDK's user avatar
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How can I make www-data's cronjobs to be executed?

I do have a server managed with Django which has Python-Crontab installed on it. Due to Django being executed by www-data user, all the Python-Crontab jobs I'm saving are being written on www-data's ...
Temas's user avatar
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2 votes
2 answers
527 views

Why can't play music at reboot?

OS info: uname -a Linux debian 5.10.0-18-amd64 #1 SMP Debian 5.10.140-1 (2022-09-02) x86_64 GNU/Linux I want to play music at reboot. sudo crontab -e @reboot /usr/bin/sleep 200;/usr/bin/mplayer /...
showkey's user avatar
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2 answers
70 views

Repeating perl script every 5 days, not nth day of month

I currently have one perl script that is used to make a memory intense call to another protocol. This takes approximately 20-25GB ram to complete. And, it takes anywhere from 8 to 15 minutes. Upon ...
Bill Wither's user avatar
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1 answer
26 views

crontab does not execute nor output send

I'm trying to run a script that archives a dir every day at 10 PM but It is not executed nor logs send. Please advise .. [root@linux]# crontab -e 0 5 * * 1 /usr/sbin/aide --check 0 22 * * * /root/...
sticletele's user avatar
0 votes
1 answer
104 views

Cronjob only on Saturday of first Thursday of the month

I want a cronjob to run only on Saturday of the first Thursday of the month. So the first Thursday of the month it will run on Saturday. If I wanna run it at 12 on the first Thursday of the month, I ...
user544737's user avatar
0 votes
3 answers
664 views

How can I log shell errors in scripts called by a cron job?

This morning I found a message saying just so: EDIT: I add the header of the message as well, so it is clear where it came from. Return-Path: <root@REDACTED> Received: from localhost (localhost [...
Ale's user avatar
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1 answer
1k views

crontab error - SSMTP - 553 5.7.1 Sender address rejected: not owned by user

As root, I installed ssmtp and I configured the /etc/ssmtp/ssmtp.conf as follows: # Sender email address [email protected] # Destination SMTP server and port mailhub=mail.domain.com:587 # ...
nicfab's user avatar
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1 answer
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This cron script was missed by shutdown

Is there a way to setup cron (or any other scheduler, like anacron) to run such that it checks immediately after I resume working on my laptop (e.g. after suspension or shutdown) whether it has ...
user7088941's user avatar
1 vote
1 answer
993 views

Cron output to file immediately

I have a Python program that runs for several hours at a time, and is run by cron: import time for _ in range(1000): print(f'{time.strftime("%r", time.localtime())}') time....
Tuor's user avatar
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222 views

Any way to change rsyslog configuration per user (for cron)?

I am a user without sudo on a CentOS 7 system running rsyslog. I would like to log my cronjobs. Ideally, rsyslog would log all my user's cron activity to somewhere like ~/log/cron. There are good ...
Jacktose's user avatar
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1 vote
2 answers
298 views

What process is generating dead.letter?

I'm using linux: Distributor ID: Ubuntu Description: Ubuntu 18.04.6 LTS Release: 18.04 Codename: bionic I noticed a few weeks ago that there is a file in my home directory: dead....
Roy's user avatar
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2 votes
1 answer
227 views

zenity failing in crontab but working in shell

I'm trying to run a script that calls zenity from a crontab and it fails. The script works well from the command line. I do pass the DISPLAY in the crontab: * * * * * DISPLAY=:1 bin/myscript.sh > /...
Colin Pitrat's user avatar
1 vote
1 answer
375 views

Config files not being read

This is a super issue weird that I cannot for the life of me figure out, so would be very grateful for assistance. My home server is an old Mac-Mini with 2 external HDD's in RAID1 using mdadm running ...
user avatar
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0 answers
26 views

Issue while moving existed file

I have a script, that does queries to clickhouse stats data that's further used for monitoring. Every query output is stored to /tmp/file.out.tmp file, and at the end of script that file is renaming ...
palmasd1's user avatar
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0 answers
481 views

Troubleshooting extremely shaky setup - Ubuntu kiosk with ubuntu-frame

I have a set of computers at work (running Ubuntu 20.04) that are used to host various containerized applications with Docker, as well as running kiosk screens using ubuntu-frame. To set up and ...
Nyfiken Gul 's user avatar
0 votes
2 answers
33 views

Time Limit execution of code for 30 days in Debian on RPI 4

I have to deliver my RPI4 to a customer for trial basis and i want to limit the execution of my code to either 100 times or make it time bound that it wont start after 30 days (a specific date). i ...
Felix's user avatar
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2 votes
1 answer
2k views

Run crontab in America/New_York time zone

We are trying to schedule a script to run at 9am ET every day throughout the year, regardless of daylight savings. On our GCP Compute Engine / Linux Server, cron runs in UTC always. It is easy enough ...
Canovice's user avatar
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1 vote
1 answer
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Linux wget -O /dev/null <http....> syntax

At my job we have a Linux server with several cron jobs with the syntax wget -O /dev/null followed immediately by an http request to a PHP file or whatever. So something like wget -O /dev/null "...
confused_nomad's user avatar
1 vote
2 answers
213 views

Delete jobs from at queue on startup

I'm on Ubuntu 18.04.6 LTS and I have a cronjob that schedules automatic shutdown commands to a specific at queue every minute: $ crontab -e */1 * * * * [ -z "$(w -h)" ] && echo "...
23tux's user avatar
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1 answer
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Root cronjobs not running

This is driving me nuts! I cannot have the job in the root crontab to run. This is what I have in the crontab: 5 * * * * /usr/bin/python3 /root/turf/recevoir_les_cotes.py 1 * * * * date >> /root/...
Ariès Pinoteau's user avatar
1 vote
1 answer
1k views

Allow 'crontab -l -u' for non-root users

I have two users: user1 and user2 user1 is added to /etc/cron.allow But when I run crontab with the -u option, I get : user1@hostname:~$ crontab -l -u user2 must be privileged to use - Is it possible ...
Aleksandr Makhov's user avatar
-1 votes
2 answers
38 views

How does CronJobs understand that the first word is user or command?

When we write in the cronjobs file: * * * * * foo bar How does the system know that foo is a user that you need to execute the bar command, or that foo is a command for which bar is an input ...
Nabi K.A.Z.'s user avatar

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