The syntax of the second field is invalid : */4
You must indicate the hours explicitly
Code:
0 0,4,8,12,16,20 * * * /home/location/scriptname
From crontab man page
Quote:
The crontab File Entry Format
A crontab file contains entries for each cron job. Entries are separated by
newline characters. Each crontab file entry contains six fields separated by
spaces or tabs in the following form:
minute hour day_of_month month weekday command
These fields accept the following values:
minute 0 through 59
hour 0 through 23
day_of_month 1 through 31
month 1 through 12
weekday 0 through 6 for Sunday through Saturday
command a shell command
You must specify a value for each field. Except for the command field, these
fields can contain the following:
o A number in the specified range. To run a command in May, specify 5 in the
month field.
o Two numbers separated by a dash to indicate an inclusive range. To run a
cron job on Tuesday through Friday, place 2-5 in the weekday field.
o A list of numbers separated by commas. To run a command on the first and
last day of January, you would specify 1,31 in the day_of_month field.
o An * (asterisk), meaning all allowed values. To run a job every hour,
specify an asterisk in the hour field.
Note: Any character preceeded by a backslash (including the %) causes that
character to be treated literally. The specification of days may be made by
two fields (day of the month and day of the week). If you specify both as a
list of elements, both are adhered to. For example, the following entry:
0 0 1,15 * 1 command
would run command on the first and fifteenth days of each month, as well as
every Monday. To specify days by only one field, the other field should
contain an * .
Hi All,
I want to run a cron job to run on the first saturday of each month at 1:30am. Would the following entry suffice this condition
30 1 6 * 6 wall %Will this work%
Appreciate your time. (1 Reply)
Hi,
Where can we find Cron job logs?i have a cron job which is not executing at all,
00 12 * * * /xx/yy/job > /pp/qq/log
if i execute the job alone,it is executing fine.
>/xx/yy/job > /pp/qq/log (is executing fine)
but its not executing when it triggered from cron.is there any place cron... (7 Replies)
Hi folks,
I have got the following cron entry ...
08 30 * * * /mp1/scripts/test.sh > /mp1/scripts/test_logs.txt 2>&1
The problem is that instead of generating a new test_logs.txt file every time it keeps on appending the outputs to the test_logs.txt file. What is it that I am doing wrong... (2 Replies)
Hi,
I am new to unix.
I have once made an entry into cron file for one scirpt to run. The script sends me email. But i want the script entry removed from the cron file.
But i am not able to find the entry in cron file. When i do crontab -e it shows content of the file but my script is... (3 Replies)
Hello All,
Anybody please help me to know ,what happens when a user having entry in both cron.allow and cron.deny files.Wheather the user will be able to access the crontab???
Thanks in advance
Vaisakh (5 Replies)
Can someone please quickly respond to this?
I need to have a script test.sh to run every 30 minutes from Monday to Saturday from 6am to 10pm as a crontab entry...
Thanks. (3 Replies)
Hi,
I need some clarification on cron entries. I have a cron job like..
15 01 19 02 6 exec /usr/bin/test.ksh
and I have another cron entry added, which is
15 01 20 02 6 exec /usr/bin/test.ksh
So, I am thinking the second cron entry shouldn't have run because 02/20 is Sunday, but... (1 Reply)
Hi,
I have to add two cron entry now. Please correct me if anything wrong
Below script should run at every one and half hour.
30 01 * * * /export/home/gxadm/scripts/collect_mq_info.pl $HOME/GCSS/logs > /dev/null 2>&1
Below script should run at every 2 hours
0 02 * * *... (9 Replies)
Hi All,
i have a folder in a server say xxx.xx.xx.xx\abcd\efgh. i want to make a cron job entry so that i would get a mail (me@example.com) on business days. will this help me...
30 4 * * 1-5 cd \abcd\efgh|ls-ltr|mailx:me@example.comhttps://www.unix.com/images/editor/code.png (10 Replies)
Hi
I have a system running solaris 11, in which I am able to execute a script from the command line, but once I put i the crontab does run, but do not give results.
The entry is:
15 11 * * * /var/oswbb/./startOSWbb.sh >> myjob.log 2>&1
30 11 * * * /var/oswbb/./stopOSWbb.sh
I have check... (2 Replies)
Discussion started by: fretagi
2 Replies
LEARN ABOUT OSF1
cron
cron(8) System Manager's Manual cron(8)NAME
cron - The system clock daemon
SYNOPSIS
/usr/sbin/cron
DESCRIPTION
The cron daemon runs shell commands at specified dates and times. Commands that are to run according to a regular or periodic schedule are
found within the crontab files. Commands that are to run once only are found within the at files. You submit crontab and at file entries
by using the crontab and at commands. Because the cron process exits only when killed or when the system stops, only one cron daemon
should exist on the system at any given time. Normally, you start the cron daemon from within a run command file.
During process initialization and when cron detects a change, it examines the crontab and at files. This strategy reduces the overhead of
checking for new or changed files at regularly scheduled intervals. The cron command creates a log of its activities. The cron daemon
must be started from the system startup scripts because it must begin execution without a login user ID set. The cron daemon starts each
job with the following process attributes stored with the job by the invoking process: Login user ID Effective and real user IDs Effective
and real group IDs Supplementary groups
It also establishes the following attributes from the authentication profile of the account associated with the login user ID of the invok-
ing process: Audit control and disposition masks Kernel authorizations
DIAGNOSTICS
The at and batch programs will refuse to accept jobs submitted from processes whose login user ID is different from the real user ID.
FILES
Specifies the command path. Main cron directory Directory containing the crontab files. List of allowed users. List of denied users His-
tory information for cron Queue description file for at, batch, and cron
RELATED INFORMATION
Commands: at(1), crontab(1), rc0(8), rc2(8), rc3(8)
Files: queuedefs(4) delim off
cron(8)