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This article introduces how to analyze the crontab environment of Solaris. The content is very detailed. Interested friends can use it for reference. I hope it will be helpful to you.

Introduction to crontab environment

The 1.cron service is available at / etc/init.d/cron

two。 Executable file / usr/sbin/cron

The 3.cron configuration file is in / etc/cron.d

File list:.proto,FIFO,at.deny,cron.allow,cron.deny,queuedefs

Connection file for 4.cron

/ usr/lib/cron/->.. /.. / etc/cron.d

5. User's crontab file location

Under the / usr/spool/cron/crontabs directory, named after the user name.

2.crontab service starts, stops

Cd / etc/init.d

. / cron start

. / cron stop

3.crontab command description

Crontab-l: lists the crontab files for the current user.

Crontab-l username: lists the crontab files for the specified user. (root users)

Crontab-e: edit the current user's crontab file.

Crontab-e username: edit the crontab file for the specified user. (root users)

Crontab-r: deletes the current user's crontab file.

Crontab-r username: deletes the crontab file for the specified user. (root users)

4.crontab syntax description

The syntax format of the user crontab file, each line of statements is: * command, each line represents a task, and there can be multiple lines of statements.

The first * field: 0: 59 indicates a score

The second * field: 1: 23 represents the hour

The third * field: 1: 31 represents the day

The fourth * field: 1 to 12 represents the month

The fifth * field: 0: 6 for the week (where 0 is Sunday)

Fifth command field: command to execute

To perform a task every 20 minutes, you can write:

0pr 20je 40 * command

To perform a task every 5 minutes, you can write:

0 command 5 10 10 15 20 25 30 35 40 40 50 55 *

To perform a task every minute, you can write:

0-59 * command

Crontab under solaris is different from that under linux. Linux supports

* / 5 means every 5 minutes

* / 20 means every 20 minutes

But solaris does not support it.

Editor settings for 5.crontab

If no editor is set, crontab-e invokes the default editor.

Set the editor: export EDITOR=vim, and then call crontab-e.

6. Give examples to illustrate

1. Export EDITOR=vim

2. Crontab-e, add:

0-59 * / export/home/netcool/cron_test.sh

Save, exit (: wq)

3. Vi / export/home/netcool/cron_test.sh

Echo "aaa" > > / export/home/netcool/cron_test.log

Chmod axix / export/home/netcool/cron_test.sh

4. Restart the service

Cd / etc/init.d/

. / cron stop

Ps-ef | grep cron to check whether it exists. You can execute more stop commands.

. / cron start

The solution to the problem that 7.Crontab does not implement

1.1. Make sure the path to execute the script is correct, preferably with the full path

1.2. Make sure the environment variables are correct

You can set the environment variable of $HOME/.profile in shell. You can add an environment variable script to shell, e.g.:

Export OMNIBUS_HOME=/opt/netcool/omnibus

1.3. Authority problem

Add the current user to / etc/cron.d/cron.allow and make sure there is no current user in / etc/cron.d/cron.deny. If there is no cron.allow file, create this file with the root user.

1.4. The problem with FIFO

1. To kill the cron process first, you can use ps-ef | grep cron to get the id number, kill-9 PID

2. Rm / etc/cron.d/FIFO

3.. / cron start

On how to carry out Solaris crontab environment analysis is shared here, I hope the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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