It's not that simple, because cron would not know about the changed file. You have to use the crontab command to change the crontab file and signal cron to reread the file. The crontab command reads $EDITOR to find out, which editor to start to edit a temporary copy of the crontab file. If the editor exits with exit code 0, the temporary copy is used to overwrite the real crontab file and cron is signalled to reread it.
This can be used to call a shellscript to modify the temporary copy, let's say to add a new entry.
First you need a shellscript like this (the name of the temporary file is passed as argument):
Save this script as change_crontab.sh and execute it:
I currently have an expect script that issues the 'mail' command and sends an 'x' when it receives the & prompt from mail to quit.
The expect script is able to do stty rows 100 columns 200 < $spawn_out(slave,name) to set up the number of columns and rows.
I would like to get rid of the expect... (0 Replies)
Hi All,
Good Day.
Anyone can guide me on how to create a cronjob script that run prstat -a and vmstat 10 10 on the certain time of the day and produce a log which will be kept in a specific directory?
I am running on Solaris 10.
Thanks. (2 Replies)
Hi,
I need to execute a crontab based on a condition where one SH file should be executed only based on the output of a file in a folder.
I have written the following cron job which is not working.
00 01 * * * read a < /px/batch/reslut.txt && && sh /px/batch/check.sh
where my... (2 Replies)
hi everyone I'm newbie in this forum hope I can get some help here :)
I have a command in crontab that executed every 1 minute
sometime this command need more than 1 minute to finish
the problem is, the crontab execute this command although it's not finish processing yet and causing the system... (7 Replies)
Dear Members,
I have a table in Oracle DB and one of its column name is INFO which has data in text format which we need to fetch in a script and create an xml file of a new table from the input.
The contents of a single cell of INFO column is like:
Area:app - aam
Clean Up Criteria:... (0 Replies)
Hello,
I am new to cron. I have a cronjob that updates a dataset in a 3rd party application. The contents of this dataset come from a text file, which is updated irregularly. Currently my cronjob runs once every week, to update this dataset (irrespective of whether the file was updated or not).... (7 Replies)
Hi Experts,
can guide how we can Update a Database Table using a txt file source Using
Unix Shell Scripts.
What are the Cron Jobs codes can written to Update DB table.
txt file contains record like data.
US 09/03/2012 User DocType DocID.
these above feilds in txt files need to be updated in... (4 Replies)
Guys
I am a complete newbie to UNIX and I need some help. My team has taken on support of a very old UNIX box which is running version 2.4.21. I need to create an urgent cronjob to restart the sladp process every sunday at 1am. This is to to provide a temp fix to a production issue. Problem I... (1 Reply)
Hello,
I have below script, which connects to ftp server, pull a file and then it renames it after deleting previous day file. This was working before but now it is not able to rename 'Red_bill.txt' to `Red_bill.V01.txt`. If I run manually 'rename Red_bill.txt Red_bill.V01.txt', I am able to... (5 Replies)
I have a shell script that runs on our webserver logs, and grabs various useful data and then outputs this data to a .csv file.
What I want to do now is schedule a cronjob to run this script for me each week at a designated time, AND email the .csv file that is created as an attachment to... (1 Reply)
Discussion started by: xdawg
1 Replies
LEARN ABOUT REDHAT
crond
CRON(8) System Manager's Manual CRON(8)NAME
cron - daemon to execute scheduled commands (Vixie Cron)
SYNOPSIS
cron
DESCRIPTION
Cron should be started from /etc/rc or /etc/rc.local. It will return immediately, so you don't need to start it with '&'.
Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; crontabs found are loaded into memory. Cron
also searches for /etc/crontab and the files in the /etc/cron.d/ directory, which are in a different format (see crontab(5)). Cron then
wakes up every minute, examining all stored crontabs, checking each command to see if it should be run in the current minute. When execut-
ing commands, any output is mailed to the owner of the crontab (or to the user named in the MAILTO environment variable in the crontab, if
such exists).
Additionally, cron checks each minute to see if its spool directory's modtime (or the modtime on /etc/crontab) has changed, and if it has,
cron will then examine the modtime on all crontabs and reload those which have changed. Thus cron need not be restarted whenever a crontab
file is modified. Note that the Crontab(1) command updates the modtime of the spool directory whenever it changes a crontab.
SEE ALSO crontab(1), crontab(5)AUTHOR
Paul Vixie <paul@vix.com>
4th Berkeley Distribution 20 December 1993 CRON(8)