Crontab is a short form of cron table. It is a configuration file that specifies shell commands to run periodically on a given schedule.

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Crontab is using some sort of hidden cache?

I used to have a crontab that ran like this * * * * * /usr/bin/php /var/www/vhosts/default/htdocs/agent/time_keeper.php > /dev/null 2>&1 It worked fine. Now I moved that php script to a ...
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1answer
2k views

Running Cronjobs as per Local Time rather than Universal Time

On running dpkg-reconfigure tzdata in terminal and i get 2 different time on my machine Local time is now: Wed May 1 11:58:55 IST 2013. Universal Time is now: Wed May 1 06:28:55 UTC 2013. ...
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8answers
66k views

Run a command every week with Cron?

Simple question- what would a crontab entry look like for a command I want to run every week on Saturday at 8:05 AM?
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33 views

Accidentally ran crontab without option, now empty

I typed crontab into the command line (Linux CentOS) and hit enter. When nothing happened I hit Ctrl+D and the command prompt came back. When I went into crontab -e the file was blank but it showed ...
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0answers
17 views

Performance loss when having too many files in /etc/cron.d?

Is there an amount of files in /etc/cron.d that would lead to worse performance? There are currently about 50 jobs in. In the future there can be up to 200 files in. Am I correct to expect the cron ...
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1answer
24 views

setting gvim as editor for crontab

I've see many post saying that by setting the following evnironment variable EDITOR=vim or VISUAL=vim will allow to use vim as code editor for crontab. I would likt to try to use gvim instead ...
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1answer
21 views

crontab and binaries in /usr/local/bin

I am working in Redhat and have few programs located in folder /usr/local/bin I would like to call from crontab for root user. I thought that by putting binaries in that folder would be sufficient to ...
6
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5answers
5k views

Run a cron job on the first Monday of every month?

I'd like to run a job from cron at 8.30 on the first Monday of every month. The cron Wikipedia page says While normally the job is executed when the time/date specification fields all match ...
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2answers
102 views

crontab email is not working as expected. First I got the emails at gmail, now I'm not getting them

First I ran a simple test to see if I could get crontab to send me an email. I created the following line: MAILTO = my_email_address@example.com 1 * * * * /bin/echo "foobar" This worked as expected ...
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34 views

How can I run a cron job from PM to AM? [duplicate]

I want to execute a script once an hour from 20:00 to 08:00. Would the following work? 0 20-8 * * * location_of_script_to_run I'm currently using the following: 0 20,21,22,23,0,1,2,3,4,5,6,7,8 * * ...
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1answer
68 views

How can I set the terminal encoding when running a crontab job?

I have a crontab job which executes a Ruby script on Arch Linux. It works basically, but when I call "googlecl" to post to my blog, it always shows a "safeDecodeError" exception (eg.: ...
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2answers
2k views

Only email on cron errors for jobs in cron.daily, cron.hourly, etc

I have several cron jobs that run (in /etc/cron.daily, /etc/cron.hourly, /etc/cron.weekly, etc.) and email root@localhost with the results. I'd like to stop those emails if the jobs are succeeding, ...
2
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3answers
195 views

crontab still sending emails even with > /dev/null

I have a crontab (root) that runs a script and output is set to > /dev/null but I always get the emails whenever it runs. I only want to receive error emails. # Rackspace driveclient update (12pm ...
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2answers
48 views

Is there any limitation on file names under Unix?

We are using crontab to schedule jobs and it was not picking the files for processing that contain [ or ] or ¿. Is there any limitation on file names or do these characters mean something in UNIX? ...
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3answers
53 views

Execute script when process reaches 6 hours of lifetime

I wonder if it's possible to execute a perl script when a process with a given PID file reaches a total of 6 hours of lifetime? Can this be done through crontab or similar? The perl script I want to ...
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2answers
377 views

Crontab Error Emails: Set Sender to Root Using -f

For a crontab entry in this format, */1 * * * * /usr/bin/php /app/<userid>/command --flag='value' I see this message emailed to <userid>@host (and view via mail) at one per minute: ...
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1answer
104 views

redirecting output in crontab

I have a shell script to monitor table stats and java apps. It works fine when I run manually. But if I put it in the crontab it will get stuck if I don't redirect it's output with export display ...
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1answer
70 views

Shutting down Linux server on first Wednesday of every month

I have written a crontab entry as: 00 19 1-7 * 3 /sbin/init 0 It should turn my linux server off on the first Wednesday of every month. Unfortunately the server went off on today (Thursday). Can ...
0
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1answer
74 views

Cronjob immediately shuts down mac after boot

I was messing around with cronjob trying to get it to forcibly shut down at a certain time everyday, but now I can't keep my computer on. It boots, loads whatever needs to load on startup, then ...
0
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1answer
205 views

Why does this bash script give an error on Ubuntu but not OSX

#!/usr/bin/env sh export $NODE_CONFIG_DIR=/Users/full/path/to/script/config cd /Users/full/path/to/script /usr/local/bin/node main The script runs locally on OSX (if I adjust the paths for the local ...
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1answer
24 views

Using undefined time in a crontab job

What happens if you program a crontab job like this: * * * * * the command Will it be executed every minute, or what?
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1answer
89 views

Getting crontab error on Xubuntu

When running the command crontab -e i get the following error: no crontab for 'myusername' - using an empty one 888 Can anyone please help?
2
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5answers
865 views

rsync works fine until I put it in crontab (UPDATE: 'date' doesn't work in crontab)

I've got this rsync command that works just fine when I run it from the command line (Ubuntu Server 12.04.1 LTS). I'd like it to run every hour, on the hour, and output the results (along with errors) ...
3
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4answers
2k views

Is it possible to use variables in crontab -e?

Can I say: MYPATH=/root/scripts MYSCRIPT=doit.sh 0 1 * * * $MYPATH/$MYSCRIPT in crontab -e ? Is it possible to use variables in crontab -e ?
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158 views

Cron unable to run shell script

I have been trying to get a shell script to run for hours using cron to no avail. I am trying to have the following bash script run every minute #!/bin/bash ...
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1answer
678 views

Can't get a script to run on startup in Debian 7

I want to get this script to run on startup on my Debian Wheezy server: /usr/bin/bitcoind so I go: $ sudo crontab -e @reboot /usr/bin/bitcoind 2>&1 >/tmp/bitcoind.out & Then save ...
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2answers
6k views

Difference between /etc/crontab and “crontab -e”

What is the difference between the crontab located in /etc/crontab and the crontab that can be edited using crontab -e?
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23 views

deleted crontab on remote machine, but I don't know how

Here's the scenario: I have ssh access to internal.foo.com through bridge.foo.com. I wanted to make a local copy of the crontab from userx on internal.foo.com. My user has sudo access on ...
0
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1answer
56 views

scheduling a script that accepts one argument in crontab

i am trying to schedule a shell script that runs for every 10 mins, and the script accepts some argument.. i have done it like this 0,10,20,30,40,50 * * * * sh ...
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4answers
3k views

Disable cron jobs for a specific user

I have a list of jobs in the crontabs for user1, user2. I want to prevent the jobs of user2 from running. I tried listing user2 in cron.deny, but that only prevents him from accessing his crontab. ...
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57 views

Macbook with lid down goes back to sleep right after scheduled wakeup

I'm trying to run an app from crontab at 3 in the morning. My 2010 MacBook Pro running OSX 10.7.5 is usually turned off at this time of the night, so I'm setting Energy Saver's scheduled wake up at ...
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2answers
261 views

Run Crontab anytime after 4pm

I am trying to run a script through crontab in osx 10.8.5 that will run at 4:30. 30 16 * * 1-5 /Library/Frameworks/Python.framework/Versions/2.7/bin/python /Users/lego90511/PycharmProjects/Stock\ ...
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1answer
105 views

Why the command substitution in the crontab job doesn't work?

crontab -l: * * * * * /Users/michel/Desktop/myScript.sh myScript.sh: #!/bin/bash /usr/local/bin/growlnotify -t 'Fact' -m "$(/Users/michel/Desktop/anotherScript.sh data.txt)" -n 'myApp' it ...
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2answers
72 views

Automating python script on a mac not running

I have tried to have this question answered twice now(1, 2). While both were informative none of the solutions have worked, and I don't know why. The first solution was to use launchctl the second was ...
1
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1answer
46 views

crontab schedule rule misunderstanding

I've got some strange behavior of one rule working unexpected. */40 * * * * myshellcommand here I though it would run each 40 minutes, e.g. 00.00 00.40 01.20 02.00 etc but instead it runs 00.00 ...
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1answer
93 views

Why nothing happens after crontab?

After executing fllowing command cursor skips to new line and nothing happens user@machine:~$ sudo crontab Why?
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2answers
351 views

Automate python script mac

I want to set up a python script to run every weekday(not sunday and saturday) on my mac OSX 10.8.4. From what I have found so far, it looks like I want to use cron. But before I do something horrible ...
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3answers
214 views

Crontab job doesn't create db backups with `mysqldump` command

When I type in my VPS: $ mysqldump --opt --user=root --password=myPass dbName>/home/myuser/dbName.sql it works and makes a backup of my dbName, but if I do it from a crontab job, it creates an ...
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1answer
48 views

sending the date in the subject in crontab

In crontab I have the following cronjob working. 0 0 * * * mysqldump -e --user=root --password=MYPASSWORD MYDB | gzip | uuencode db_date +"\%Y-\%m-\%d".gz | mail -s 'date +"\%Y-\%m-\%d"_dump' ...
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2answers
637 views

Do I need postfix for /var/mail/root to work?

I want crontab to log errors. As far as I know, this is being logged to /var/mail/root, but it doesn't seem to be working. Do I need to install postfix for this to work?
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0answers
72 views

setting a cronjob in IST time [closed]

I am trying to set a cronjob run in a different timezone..i have goolged a lot and found editing /etc/default/cron is the way to go...but this file is deprecated and I see the following message,so I ...
0
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2answers
426 views

Linux - starting a visible terminal on boot

I have a C program I wrote for debian on the raspberry pi that asks the user to enter a number, 1-4 which it then stores in a configuration file. This only happens if the configuration file is ...
0
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3answers
393 views

Run crontab non-interactively from script

I would like to schedule some tasks on remote servers by script but am having an issue with crontab expecting to be run interactively the first time. As far as I understand crontab needs to be ...
2
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2answers
580 views

Working with git via crontab

I have the following shell script #!/bin/bash REPODIR=$HOME/work/repository/ cd $REPODIR var=`git fetch --dry-run 2>&1` echo $var > $HOME/error.txt I want to run my script every minute, ...
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1answer
100 views

How can I sync cronjobs from one server to another?

What is the configuration file that defines the cronjobs? I know you can crontab -e, but it points to a temporary file.
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0answers
77 views

Enabling crontab logging on openSUSE

I am trying to enable the crontab log on openSUSE 11.3. I searched the web but couldn't find how to do it. I only find information about Ubuntu. Tried editing the /etc/rsyslog.d/remote.conf file but I ...
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3answers
119 views

OsX Crontab having no effect

I am dynamically appending cron tasks to the user crontab The tasks seem to be getting adde, crontab -e looks like: */10 * * * * /bin/sh /Users/john/Kiosk/app/content/update.sh @reboot /usr/bin/open ...
1
vote
1answer
81 views

Job shows up in crontab -l but not in /etc/crontab

There is a certain job that shows up when I do $ crontab -l and I can verify that this is also running. However, the job is not listed in /etc/crontab. Say the job is /somedir/somefile I can't ...
1
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1answer
137 views

I created Cron but I get errors that don't really understand

I created a crontab like this: 0 22 * * 2 /bin/echo " Hello World " 0 1 * * * /bin/echo " Test" but I receive mails like this, what does it mean? Subject: Cron /bin/echo " Test" ...
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2answers
327 views

Linux - switch to “cron” user

Sometimes i have issues with cron jobs not running, and diagnosing why can be difficult. What would be useful is to switch to the same user as the cron jobs run under, so i can see if there's a ...