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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2
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2answers
198 views

How can I change the directory a command thinks it is running in?

How can I run a command that is in a different directory so that the command thinks I've ran it in the current directory? If a command is using basename() or argv[0] (or whatever it's called) to get ...
0
votes
2answers
24 views

Why is this cronjob not working?

I have a ruby script in ~/custom_scripts/get_all_products.rb. I want it to run every night at 04:00. Here's what the cronjob in crontab -e looks like: MAILTO="<email>" 0 4 * * * ruby ...
0
votes
1answer
9 views

How to execute a Linux Cron Job from day x to y on crontab?

I found that I can use an hour range by using a slash, for instance, 4-20 to run from 4AM until 8PM. But what about day range? Can I use something like: * * 5-20 * * CMD
0
votes
1answer
523 views

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 ...
1
vote
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. ...
35
votes
8answers
69k 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?
0
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0answers
37 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 ...
2
votes
0answers
19 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 ...
0
votes
1answer
26 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 ...
0
votes
1answer
22 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
votes
5answers
6k 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 ...
0
votes
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 ...
1
vote
0answers
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 * * ...
0
votes
1answer
90 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.: ...
5
votes
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
votes
3answers
251 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 ...
0
votes
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? ...
1
vote
3answers
55 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 ...
5
votes
2answers
385 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: ...
0
votes
1answer
131 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 ...
1
vote
1answer
72 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
votes
1answer
79 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
votes
1answer
246 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 ...
0
votes
1answer
26 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?
0
votes
1answer
91 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
votes
5answers
916 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
votes
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 ?
0
votes
1answer
170 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 ...
0
votes
1answer
764 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 ...
10
votes
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?
0
votes
0answers
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
votes
1answer
58 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 ...
0
votes
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. ...
0
votes
0answers
60 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 ...
1
vote
2answers
277 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\ ...
0
votes
1answer
108 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 ...
0
votes
2answers
76 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
vote
1answer
47 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 ...
0
votes
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?
1
vote
2answers
375 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 ...
1
vote
3answers
225 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 ...
0
votes
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' ...
0
votes
2answers
688 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?
1
vote
0answers
75 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
votes
2answers
450 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
votes
3answers
411 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
votes
2answers
648 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, ...
0
votes
1answer
107 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.
1
vote
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 ...
0
votes
3answers
121 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 ...