at is usually for non-regular, one-time-only jobs while cron is usually for regular, perpetual jobs ...
at samples:
cron samples:
however, you can also get a job to go regularly with an at command by adding something like this in your script ...
... and a "one-time" job in cron ... (will only run when all time conditions are met) ...
btw, it would be best if you get into checking the man pages while you're just starting ... see "man at" and "man crontab" ...
Hi all,
I dont know if its the right place to ask it,
but can someone please explaine me the differnce between sun 220R server to a sun netra 1125?
any recommendation on which one is better?
Dori (2 Replies)
Hi all,
I would like to know the difference between these commands
/usr/lib/fs/hsfs/mount -F /dev/lofi/1 /usr
and
mount -F hsfs /dev/lofi/1 /usr
In the first case absolute path is specified and in the next the cmd with options ,whats the differnce.
PS:am sorry ,coz this had been... (1 Reply)
Dear all
We have SunOS 5.10 Generic_127127-11 sun4u sparc SUNW,Sun-Fire-V250
i have scheduled cronjob but its not working
Crontab details
15 15 * * * /d5/oratest/testdb/hotbackup_new.sh TEST247
15 15 * * * mkdir -p rajesh /d4/appltest
Crontab log details
> CMD: mkdir... (4 Replies)
Greetings everybody,
I have an IBM P520 AIX 5.3 server machine and trying to use crontab to periodically excute a script that contains a command belongs to my software (Fast/Tools SCADA software)
I added the following line after using crontab -e
01 * * * * /mypath/myscript
I have two... (3 Replies)
Hi,
I had setup crontab to execute my script every day midnight 00:00
Below are the current settings.
crontab -l
0 0 * * * /apps/bin/compress.ksh_moht > /dev/null 2>&1
Should it not work?
I need help fix this? (8 Replies)
I can run manually script of ntopdump.sh but crontab can't run this script very five minutes.
# crontab -l
*/3 * * * * root sh /root/ping.sh
*/5 * * * * root sh /root/ntopdump.sh
#
# pwd
/root
# ls -l
total 88
-rwxrwxr-x 1 root root 1645 Jun 14 19:01 anaconda-ks.cfg
drwxrwxr-x 2 root... (14 Replies)
Shell = ksh
Hi all,
I scheduled an automated job on my application server like below,
30 13 * * 1-5 $HOME/my_script.sh
However the script was not executed as expected. Any reason that may cause this to happen? (6 Replies)
Hi,
When I set the crontab to run every minute, every hour, it works fine.
* * * * * env > /tmp/env.output
However I want to run it every day at 8:00 AM and it does not run.
* 8 * * * env > /tmp/env.output
I ran the 'date' command which says it's 8AM PST and also the 'TZ'... (0 Replies)
Hi,
I know this is a common topic. I'm trying to launch a perl script using a contab -e entry. I've been trying diff options but nothing seems to work:
My cron is running:
UID PID PPID C STIME TTY TIME CMD
root 3755 1 0 Nov27 ? 00:00:00 crond
This... (4 Replies)
Dear Friends,
I have Red Hat Linux Enterprise version 6.3. running SAP and oracle.
I have created one crontab for user orasid to execute one job periodically.
But it is not executing. I have checked crontab service is running.
Please help in the matter.
Regards,
Bhagawati Pandey (5 Replies)
Discussion started by: BPANDEY
5 Replies
LEARN ABOUT FREEBSD
crontab
CRONTAB(1) BSD General Commands Manual CRONTAB(1)NAME
crontab -- maintain crontab files for individual users (V3)
SYNOPSIS
crontab [-u user] file
crontab [-u user] { -l | -r | -e }
DESCRIPTION
The crontab utility is the program used to install, deinstall or list the tables used to drive the cron(8) daemon in Vixie 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 allow file exists, then you must be listed therein in order to be allowed to use this command. If the allow file does not exist but
the deny file does exist, then you must not be listed in the deny file in order to use this command. If neither of these files exists, then
depending on site-dependent configuration parameters, only the super user will be allowed to use this command, or all users will be able to
use this command. The format of these files is one username per line, with no leading or trailing whitespace. Lines of other formats will
be ignored, and so can be used for comments.
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 following options are available:
-u Specify 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(1) can confuse crontab and that if you are running inside of su(1) you
should always use the -u option for safety's sake.
-l Display the current crontab on standard output.
-r Remove the current crontab.
-e Edit the current crontab using the editor specified by the VISUAL or EDITOR environment variables. The specified editor must edit
the file in place; any editor that unlinks the file and recreates it cannot be used. After you exit from the editor, the modified
crontab will be installed automatically.
FILES
/var/cron/allow List of users allowed to use crontab
/var/cron/deny List of users prohibited from using crontab
/var/cron/tabs Directory for personal crontab files
DIAGNOSTICS
A fairly informative usage message appears if you run it with a bad command line.
SEE ALSO crontab(5), cron(8)STANDARDS
The crontab command conforms to IEEE Std 1003.2 (``POSIX.2'') with the exception that the dangerous variant of calling crontab without a file
name in the first form of the command is not allowed by this implementation. The pseudo-filename '-' must be specified to read from standard
input. The new command syntax differs from previous versions of Vixie Cron, as well as from the classic SVR3 syntax.
AUTHORS
Paul Vixie <paul@vix.com>
BSD May 13, 2010 BSD