setting a cron job

tererez · #1 (**permalink**) 03-30-2008

Greetings i am a newbie to this so kindly bear with me. I have a script to get weather information from a site and save that into a database.

Code:

wget Cranfield Weather Forecast
temp = $(cat wx.php | grep -o "Temperature.......")
rm wx.php
mysql -D "weather_wise" -e "insert into weather (date,hour,degrees) values (now(),now(),$temp)";

how would i set up a cron job for this given that i want:
0 00-23 * * 0-7 command ?

manas_ranjan · #2 (**permalink**) 03-31-2008

what is your condition to run the scripts.....e.g. when at what time the scripts needs to invoke.

before that check whether your cron deamon(crond) is running or not, if running setting up cron will not make an issue, if not then try to invoke that one , then set your cron, with absolute path, will work fine.

Yogesh Sawant · #3 (**permalink**) 03-31-2008

this would help you

preyan · #4 (**permalink**) 04-01-2008

User defined crons have to be created using the command crontab -e

set your cron accordingly

30 14 * * * <your file (eg.sh weather)>
| | | | |_____ Day of the week(0-6)
| | | |_______ Month (1-12)
| | |_________ Day of the Month (1-31)
| |___________ Hour of the Day (0-23)
|______________ Minutes (0-59)

cron start --start your cron
cron stop --stop your cron

Tornado · #5 (**permalink**) 04-01-2008

I use this header at the top of the crontab file to make it easier when reading.

Code:

#Minute (0-59),
#|      Hour (0-23),
#|      |       Day of the month (1-31),
#|      |       |       Month of the year (1-12),
#|      |       |       |       Day of the week (0-6 with 0=Sunday).
#|      |       |       |       |       Commands
#|      |       |       |       |       |
#-------------------------------------------------------------------------------------------------------

So your crontab will look something like this:

Code:

# sudo crontab -l
#ident  "@(#)root       1.21    04/03/23 SMI"
#
# The root crontab should be used to perform accounting data collection.
#
#
#Minute (0-59),
#|      Hour (0-23),
#|      |       Day of the month (1-31),
#|      |       |       Month of the year (1-12),
#|      |       |       |       Day of the week (0-6 with 0=Sunday).
#|      |       |       |       |       Commands
#|      |       |       |       |       |
#-------------------------------------------------------------------------------------------------------
10      3       *       *       *       /usr/sbin/logadm
15      3       *       *       0       /usr/lib/fs/nfs/nfsfind
30      3       *       *       *       [ -x /usr/lib/gss/gsscred_clean ] && /usr/lib/gss/gsscred_clean

stewarr · #6 (**permalink**) 04-01-2008

0 00-23 * * 0-7

Try 0-6 not 0-7?

era · #7 (**permalink**) 04-01-2008

Help with wget
Help Inserting data in mysql table

Is that you, or does it just look a lot like you? Is this a homework assignment where all of you were directed to this site for help?

For what it's worth, those threads have more elegant solutions for getting the temperature from the web site. You should avoid using a temporary file, and you should avoid cat file | grep when just grep file works fine.

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