A well established form of application cron jobs look like this:
The repetition makes it a long line, hard to read, hard to maintain.
I suggest the following instead:
Should work even with the oldest Bourne shells.
Don't miss the semicolon between the command and the closing brace! The shell syntax requires it. Also the braces must be separated with a space character.
These 4 Users Gave Thanks to MadeInGermany For This Post:
Hi,
as a Mac OS X user I am not into Unix at all. But since it is possible to run Unix application on Mac I am specialy interested in a program making scientifical graphs. There is SigmaPlot for WIN PC´s and this is more or less what I would like to use.
So, here comes the question: is there a... (3 Replies)
I run cron in solaris 10 zone. One cron job which syncing files to nfs mounted on container, creates after finishing another cron proccess(/usr/sbin/cron), and after 100 existing cron proccesses next cron job will not start. It's too weird for me, I'm not able to solve this problem. Theoretically... (3 Replies)
Hi,
How to add a cron job in /etc/crontab using a shell script.??:confused:
Actually the requirement is we need to run a script say, XXX.sh every 10 min through “cron”.
That can be achieved by adding the below code line in the /etc/crontab , (i.e., “crontab -e ” command to add this to the... (4 Replies)
Hi ,
I have removed a cron for particular user , but cron job seems to be running even after the cron entry is removed. The purpose of the cron was to sendmail to user ( it uses mailx utility )
I have restarted cron and sendmail service still user is getting mail alerts from the cron job. And... (4 Replies)
ofIn a big Unix environment you likely install cron jobs like this on a thousand systems:
39 15 * * * { /usr/local/monitoring/sendstats ; } >/dev/null 2>&1If all the system clocks are synchronized (usually via NTP), these jobs run *exactly* at the same time.
If the cron job accesses a shared... (2 Replies)
Hi,
1)
If some job supposed to run on 1st of every month at 7 AM
In cron job when we have a blackout on the 1st ( i.e when 1st falls on a sunday ) how can we make the job run the next business day?
2) How can we run a job on 25th of every quarter 7 AM(jan,apr,jul,oct)
And if 25th... (5 Replies)
Hello,
I have written a cron job to automate the sftp of files using key authentication.
I wanted to add a timeStamp and name of file sent to a log file and append each these details to the same file each time files are sent and if possible include whether the files were sent successfully or not.... (3 Replies)
Dear members, moderators and others.
While working on <insert project>, a need has surfaced to watch a directory, and when a file comes, to do appropriate action.
So, i started writing some shell code, aware of linux inotify-tools package with inotifywait.
Also, i'm seeing a lot of similar... (1 Reply)
Discussion started by: Peasant
1 Replies
LEARN ABOUT ULTRIX
crontab
crontab(5) File Formats Manual crontab(5)Name
crontab - clock daemon table file
Syntax
/usr/lib/crontab
Description
The command executes at specified dates and times according to the instructions in the file. The file consists of lines with six fields
each. The format for a line is as follows:
minute hour day month weekday command
The following list defines each field in the line:
minute (0-59) The exact minute that the command sequence executes.
hour (0-23) The hour of the day that the command sequence executes.
day (1-31) The day of the month that the command sequence executes.
month (1-12) The month of the year that the command sequence executes.
weekday (1-7) The day of the week that the command sequence executes. Monday = 1, Tuesday = 2, and so forth.
command The complete command sequence variable that is to be executed. Note that the command string must conform to Bourne shell
syntax.
The first five integer fields may be specified as follows:
o A single number in the specified range
o Two numbers separated by a minus, meaning a range inclusive
o A list of numbers separated by commas, meaning any of the numbers
o An asterisk meaning all legal values
The sixth field is a string that is executed by the shell at the specified times. A percent sign (%) in this field is translated to a new-
line character. Only the first line of the command field, up to a percent sign (%) or end of line, is executed by the shell. The other
lines are made available to the command as standard input.
Examples
The following example is part of a file:
# periodic things
0,15,30,45 * * * * (echo '^M' `date`; echo '') >/dev/console
0,15,30,45 * * * * /usr/lib/atrun
# daily stuff
5 4 * * * sh /usr/adm/newsyslog
15 4 * * * ( cd /usr/preserve; find . -mtime +7 -a -exec rm -f {} ; )
20 4 * * * find /usr/msgs -mtime +21 -a ! -perm 444 -a ! -name bounds
-a -exec rm -f {} ;
# NOTE: The above line is wrapped.
# local cleanups
30 4 * * * find /usr/spool/mqueue -type f -mtime +5 -name df-exec rm {} ;
35 4 * * * find /usr/spool/mqueue -type f -mtime +5 -name tf-exec rm {} ;
40 4 * * * find /usr/spool/rwho -type f -mtime +21 -exec rm {} ;
#
# redirecting error output
0 17 * * 1,3,5 /bin/tar -cv /usr/sysads/smith > /dev/console 2>&1
#
FilesSee Alsosh(1), cron(8)
Guide to System Environment Setup
crontab(5)