Cron Queries

Hi All,

I have perl script which I am trying to run on 1st Monday via cron job.
So I scheduled it as follows:

0 0 1-7 * * root ["$(date '+%a')" = "Mon"] && /usr/bin/perl script.pl

But then it didn't run so checked cron log and it seemed like its missing the command. so added a \ in front of %a and then it picked up the whole command as per cron log.

But still it didnt ran the script. I then change the script to just && echo "test">/tmp/test

Still nothing. if I run it as /usr/bin/perl script.pl it runs though

Thanks in advance.

Hi Team,

I have setup few jobs with separate log files and separate EMail ID's for each job in my cron.
If something fails in these jobs, cron is delivering a mail to the mail ID that I have configured in cron as MAILTO= ( can be seen in crontab -l).

In this course, few passwords are also being returned as output from failed jobs which are being emailed to MAILTO ID.

I want to suppress the password while sending the cron output to the MAIL ID's.
Can anyone please guide me in this?

Note: I am not root user so I don't have access to /etc/syslog.conf.

I added a cron job , but I found that even set * * * * * ~my_cronjob , it only only it at EVERY MINUTE , if I want it run at every 20 second , can advise what can i do ? thx

Hi All,

I have facing a problem with cron job.
Actually on the client server there are some cronjob scheduled
as follows:

@daily sh_file.sh 2>&1>> /dev/null #Contact: vali.zachia@gmail.com
@hourly php demo.php 2>&1 >> /dev/null
10 2 * * * wget --no-check-certificate url 2>&1 > /dev/null #Cron IE
10 2 * * * wget --no-check-certificate url 2>&1 > /dev/null #cron EN
@daily sh script.sh
@daily sh script.sh
@daily sh script.sh
@hourly wget --no-check-certificate url 2>&1 > /dev/null
@daily wget --no-check-certificate url 2>&1 > /dev/null #Cron Poland
@daily wget --no-check-certificate url 2>&1 > /dev/null #Cron Norway
@daily wget --no-check-certificate url 2>&1 > /dev/null #Cron Portugal
10 2 * * * wget --no-check-certificate url 2>&1 > /dev/null #Cron GR
@daily wget --no-check-certificate url 2>&1 > /dev/null
@daily wget --no-check-certificate url 2>&1 > /dev/null
@daily wget --no-check-certificate url 2>&1 > /dev/null #Denmark



Cronjobs are scheduled daily/hourly.

But what happends after every hour/day there is a blank file created in a folder .

like :
hourly.1

hourly.2
hourly.3
hourly.4

and so on similary for daily scripts.

I am not sure whether these are created by cron job
So please clarify whether cronjob provides some thing like above or it is the code problem

I found this command on my crontab, i know what is "30 3 * * * /usr/bin/php5 /home/super/public_html/index.php" but what is "Cron Delete" ?

"30 3 * * * /usr/bin/php5 /home/super/public_html/index.php Cron delete"

I see that you can set CRON jobs to run hourly etc, but I don't see any exapmles of setting one up to start and stop at specified times.

The job I want while run continuously, once started at 6pm, until all of the records are processed or until 6am.

Can this be done?

If so, how?

PS. 6 months ago I couldn't even spell LINUX.

Hi,

Is it possible to schedule a cron job runs every quarter of the year? If so, how to go about it?

Thanks in advance.

I have a small script1 scheduled via cron to run every 20 mins to invoke script2 if script2 is not running.
When i run script1 from cmd line it works fine but when it is scheduled via cron it doesn't work. Not sure what am i doing wrong here.
I even tried to use absolute path.

Script 1
Code:

#!/bin/sh
/bin/ps -ef |/bin/grep script2.sh |/bin/grep -v $$ > /dev/null 2>&1
if [ $? -ne 0 ]
then
/usr/bin/nohup /home/user1/script2.sh &
fi

CRON LOG :
Feb 9 17:00:01 server1 crond[29771]: (user1) CMD (/home/user1/chk_script1.sh >/dev/null 2>&1)
Feb 9 17:20:01 server1 crond[21095]: (user1) CMD (/home/user1/chk_script1.sh >/dev/null 2>&1)
Feb 9 17:40:01 server1 crond[11218]: (user1) CMD(/home/user1/chk_script1.sh >/dev/null 2>&1)
Feb 9 18:00:01 server1 crond[29961]: (user1) CMD(/home/user1/chk_script1.sh >/dev/null 2>&1)

CRON JOB :
00,20,40 * * * * /home/user1/chk_script1.sh >/dev/null 2>&1

hello,
I have to mail the status of my server everyday.
How do I write a script which will help me do so??
I DO NOT want to use cron job. Is there some other alternative using which I can accomplish my task.

Thankyou

I'm running LinuxLite 2.0 32bit on a Dell 3000.

I have never come across anything like this and to tell you, I am stumped.

Here are the contents of my crontab file:

Code:

# Edit this file to introduce tasks to be run by cron.
#
# Each task to run has to be defined through a single line
# indicating with different fields when the task will be run
# and what command to run for the task
#
# To define the time you can provide concrete values for
# minute (m), hour (h), day of month (dom), month (mon),
# and day of week (dow) or use '*' in these fields (for 'any').#
# Notice that tasks will be started based on the cron's system
# daemon's notion of time and timezones.
#
# Output of the crontab jobs (including errors) is sent through
# email to the user the crontab file belongs to (unless redirected).
#
# For example, you can run a backup of all your user accounts
# at 5 a.m every week with:
# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
#
# For more information see the manual pages of crontab(5) and cron(8)
#
# m h  dom mon dow   command
*/10 * * * * /usr/bin/arecord -t wav -f cd -d 42 /home/randy/Music/lanting$(date "+\%^b\%d\%y").wav

If I run this from the terminal, everything is fine. It properly records the audio:

Code:

/usr/bin/arecord -t wav -f cd -d 42 /home/randy/Music/lanting$(date "+\%^b\%d\%y").wav

If I run this as it is shown in my crontab file, it records but there is no audio recorded.:


Code:

*/10 * * * * /usr/bin/arecord -t wav -f cd -d 42 /home/randy/Music/lanting$(date "+\%^b\%d\%y").wav

What could be causing this? I tried different cron settings for example 15 14 * * 2

This recorded at 2:15pm on Tuesday (today) but no audio. Yet if I run the code as mentioned above, from the terminal without the cron settings, the recording is fine.

Any ideas what I should do?