I have a script that I need to schedule on daily basis. How can I schedule a script in centos. Like I want to run that script evryday at 10 AM and can I store the output of the script in a log file.
Thanks
---------- Post updated 04-18-14 at 12:52 AM ---------- Previous update was 04-17-14 at 11:23 PM ----------
To schedule a script, you'll need to use crontab. You can add a schedule entry by doing:
Once you are inside, the cron accepts pattern in the form:
So a correct crontab entry for 10am would be
If you want to capture the output you can specify the logfile inside cron like
0 10 * * * /path/to/script > /path/to/log/output.log
Just ensure you put a she-bang header in your script. Alternatively, you can specify the shell interpreter inside cron by saying:
Hi,
I need to schedule a shell script which executes another shell script along with a series of other commands.
When the inner shell script is executed it prompts for a password.....
This inner shell cannot be changed
How can I do this????
Regards,
Chaitrali. (4 Replies)
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HI Guys
I need one shell script to be scheduled to run one shell script to be executed automatically every Wednesday at 10 AM Without crontab and "at" command..
Could you provide your suggestions ?
Thanks and Regards
kshitij Kulshreshtha (6 Replies)
Hi,
Apologies if this is not right section to post my requirement.
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Discussion started by: prvnrk
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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)