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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3
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2answers
123 views

How do I run a `/usr/sbin/` binary in cron?

As root I added used crontab -e to add my script. However the script uses a binary in /usr/sbin/ and I get an error about it not existing when the script runs from cron. How do I fix this?
2
votes
1answer
808 views

Set default editor for crontab -e invoked with sudo

I'm using Bash on Debian Squeeze. I just read this topic: change default text editor for crontab to vim I have exported both variables VISUAL and EDITOR to vim for normal user and for root. And this ...
1
vote
0answers
14 views

Skip syslog/rsyslog logging of certain cron jobs [migrated]

In most GNU/Linux distributions the default is to log start (and many different events) of every cron job to syslog. It's rather convenient, but not for a very frequent jobs, which started, say, every ...
1
vote
2answers
22 views

cron expression for every hour starting from specific time

Every one hour (starting from "now") I am able to schedule using this cron expression (expression) using nodejs cron-job. But I need to set cron every one hour starting from a specific time. For ...
0
votes
2answers
457 views

Cron job for moving directories older than 24 hours

Well, what I want to do is The cron should run every hour or so It should move the directories in a folder /disk1/data/ older than 24 hours to /disk2/data/ The directories moved should contain all ...
0
votes
1answer
10 views

schedule a crontab to shutdown the machine after a specific process (with PID) has finished

Say I have this process with PID = 1234 currently running. I don't know how long it's gonna take for it to finish. Is it possible to schedule a cron tab to keep checking for the status of the ...
1
vote
2answers
60 views

Automating an ssh connection with crontab

I've been struggling to crontab automate a git push process with ssh, and it's proving tricky to setup a key with the ssh agent. Starting with a basic script to test the agent: # set paths (all ...
9
votes
5answers
9k 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
1answer
71 views

automatically start netcat on localhost and remote-host and keep it active

I found this answer by @jeremytrimble on Stack Overflow which explains how you can read a FIFO file over network. I wonder if it’s possible to start these netcat commands automatically, e.g. in a ...
6
votes
2answers
3k views

Multiple crontabs for one user

is there a way to use multiple crontab files for one user? Thinking something along the lines of crontab file per project instead of crontab per user... Any help is appreciated...
0
votes
1answer
43 views

Why are some of my cron jobs not sending emails?

To send emails, I use the standard configuration with: MAILTO="example@gmail.com" Here is the content of my crontab: 00 3 * * 2 echo "Internal Backup (mysql) has started!" && tar -zvcf ...
0
votes
1answer
110 views

cannot rsync via ssh from crontab

I'm having issues transferring files with rsync via ssh. If I just run rsync -avz devel@10.10.10.83:/home/devel/ $/home/user/rsync/servidor it works as expected since the public key is stored in ...
0
votes
1answer
22 views

Incron Job is not being executed

I am using incron to monitor one of my file in /var/www/html directory. output of incrontab -l /var/www/html/test IN_ACCESS /home/intel/test.sh This job is supposed to create a file in home ...
0
votes
1answer
42 views

Check for screen using crontab

Currently, I'm using Debian with the following cronjob for screen at reboot: @reboot screen -dmS app1 /home/app1 @reboot screen -dmS app2 /home/app2 The problem is, that sometimes the application ...
0
votes
0answers
50 views

Crontab: issue launching Node server on restart

Situation Hi, i have a situation where i need to launch a node.js server after OS X reboot. I run node.js with nodemon, which keeps it forever. And i run the nodemon command in a screen process. ...
0
votes
2answers
54 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
2answers
1k views

How to save Crontab edits?

I ran crontab -e and made some changes, now how do I save it?
0
votes
0answers
75 views

Not able to open crontab -l

I am running crontab -l to view the crons on a RHEL server(v5.10) and getting the below error: crontab: error while loading shared libraries: libaudit.so.1: cannot open shared object file: No such ...
1
vote
0answers
229 views

Why isn't crontab working for me? (Ubuntu 11.04)

I can't get the crontab jobs running. I've checked /var/log/syslog and the scheduled jobs aren't there. I've edited the jobs with sudo crontab -e so they are created for root. This is how my jobs ...
1
vote
2answers
269 views

Why echo $(crontab -l) outputs current working directory listing and only then the content of crontab file itself?

So if cwd is the /tmp now: crontab -l > #min hour day mon dow command > * * * * * /usr/local/bin/growlnotify -t 'helloTitle' -m 'helloMessage' -n 'myApp' -sw but: echo $(crontab -l) > ...
0
votes
0answers
153 views

Correct crontab settings on Cpanel/WHM Cron on CentOS 6.5

I have recently migrated from collocation to Amazon EC2 and setup new WHM installs with CentOS 6.5 I then used the Transfer tool to move all websites to the new server, however I am trying to transfer ...
0
votes
0answers
10 views

CronJob doesnt seem to be executing my SH script

SH script does has permission. (Chmod +x) Timezone on the server is set correctly. So, for some reason it seems as if my cronjob I have setup is not running my SH script. I think it had something to ...
0
votes
1answer
66 views

Crontab x minutes past every hour on Ubuntu

I haven't been able to find an example of how to run a command in crontab at 5 minutes past every hour. I assumed that this would work 5 */1 * * * But it doesn't run. Can anyone help? Thanks in ...
1
vote
1answer
39 views

Crontab cannot find program installed in local user's bin dir

I am trying to run a bash script on a dreamhost account that does some backup operations. The program I use to do the backup is installed in the home directory of the web hosting account under ...
0
votes
0answers
178 views

Why does my bash command not work in cygwin cron?

I have a simple shell script that works perfectly in cygwin under my login: /cygdrive/c/Users/sam.walton/work/inspector/push_db.sh It will download a file via curl and dump it to a Windows share. ...
1
vote
1answer
652 views

Background Jobs from cron

I am running a cron on every two minutes. From the cron I am running other shell scripts in background with "&". After cron exits spawned shell script process still runs, this is desired behavior. ...
0
votes
1answer
74 views

Cron jobs on IBM i 7.1

I just found out today that on an IBM i system I am able to use SSH to get to a Unix-like terminal (AIX/PASE) and would like to use this to schedule automated tasks using crontab. Does anyone know if ...
2
votes
1answer
5k 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. ...
2
votes
2answers
223 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
111 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
18 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
786 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 ...
44
votes
8answers
90k 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
votes
0answers
74 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
28 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
54 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
83 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 ...
0
votes
2answers
111 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
35 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
337 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
3k 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, ...
3
votes
3answers
899 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 ...
1
vote
3answers
64 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
565 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
228 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
149 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
149 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
514 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
30 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
124 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?