My suggestion is do not do that! First of all, simply changing the crontab file is NOT correct. You must use the crontab command or cron will not notice the change.
But what you should do is make the entry in root's crontab a shell script. And the shell script should, at the top, do something like:
This is much cleaner than having scripts that fiddle with root crontab. Sooner or later the scripts fail and root is left with no crontab. With the inhibit-file concept, you just touch a file to inhibit the corresponding cronjob and then later you remove the inhibit file when you the script to run all the way.
Hi i have a ques in Shell scripting:
ques: accept a filename as a command line argument. Validate the input and display the last modification date for that file.
Help pls. (4 Replies)
Hi all -
I've searched the forums and seen a few questions related, but nothing which explicitly answers what I'm looking for.
I need to know if there's ANY way to get the modification history of any users crontab.
Yes, I know that crontabs are in /var/spool/cron. I know that the... (2 Replies)
Hello everyone,
I would like to know how to compare two files and modify any differences with some other data using shell script.
I think it would be better understood with an example.
I got two files named 'filex' and filey'. 'filex' is constant file without any changes in data. 'filey' is... (2 Replies)
Hi all
Iam very new to Shell Scripting, I have to modify a shell script looking at an existing one except that it will query against some table X in A database.
Befor Spooling check if there are any reload files if there archive the files.
The above scipt executes some abc.sql which will b a new... (2 Replies)
Hello Team,
I have prepared script which will check for listening message for ports 1199,1200 and 1201. I need modifcation in script in such a way that if port 1200 is not listening then it should message rmi port 1200 is not listening. Smap for port 1199 and 1201.
kindly guide me to acheive... (4 Replies)
I need to get notification via email when the line containing a pattern is changed in a file. Not during the time any changes to file occurs. Ie if we reset a user password say example, demouser the hash in the line containing the word demouser in the file /etc/group changes. So when this change... (1 Reply)
Hi ...programmers...
I need a shell script to perform some specific task..
my txt file looks like this
netcdf new {
dimensions:
XAX1_11 = 11 ;
variables:
double XAX1_11(XAX1_11) ;
XAX1_11:point_spacing = "even" ;
XAX1_11:axis = "X" ;
float DEPTH(XAX1_11) ;... (19 Replies)
so I'm using this shell script someone made to backup data on a server in an archive (gpg encrypted) and upload to an FTP (meant to be run as a cron job daily). can one of the experts here confirm if the script is fine?
It is meant to backup the folder /opt and the sql data
i want to know how I... (9 Replies)
Discussion started by: galapagos8000
9 Replies
LEARN ABOUT SUSE
crontab
CRONTAB(1) General Commands Manual CRONTAB(1)NAME
crontab - maintain crontab files for individual users (ISC Cron V4.1)
SYNOPSIS
crontab [-u user] file
crontab [-u user] [-l | -r | -e]
DESCRIPTION
Crontab is the program used to install, deinstall or list the tables used to drive the cron(8) daemon in ISC Cron. Each user can have
their own crontab, and though these are files in /var, they are not intended to be edited directly.
If the cron.allow file exists, then you must be listed therein in order to be allowed to use this command. If the cron.allow file does not
exist but the cron.deny file does exist, then you must not be listed in the cron.deny file in order to use this command. If neither of
these files exists, only the super user will be allowed to use this command.
If the -u option is given, it specifies the name of the user whose crontab is to be tweaked. If this option is not given, crontab examines
"your" crontab, i.e., the crontab of the person executing the command. Note that su(8) can confuse crontab and that if you are running
inside of su(8) you should always use the -u option for safety's sake.
The first form of this command is used to install a new crontab from some named file or standard input if the pseudo-filename ``-'' is
given.
The -l option causes the current crontab to be displayed on standard output.
The -r option causes the current crontab to be removed.
The -e option is used to edit the current crontab using the editor specified by the VISUAL or EDITOR environment variables. After you exit
from the editor, the modified crontab will be installed automatically.
SEE ALSO crontab(5), cron(8)FILES
/etc/cron.allow
/etc/cron.deny
STANDARDS
The crontab command conforms to IEEE Std1003.2-1992 (``POSIX''). This new command syntax differs from previous versions of Vixie Cron, as
well as from the classic SVR3 syntax.
DIAGNOSTICS
A fairly informative usage message appears if you run it with a bad command line.
AUTHOR
Paul Vixie <vixie@isc.org>
4th Berkeley Distribution 29 December 1993 CRONTAB(1)