Tags » Cron

What are cron and crontab, and how do I use them?

The cron daemon is a long-running process that executes commands at specific dates and times. You can use this to schedule activities, either as one-time events or as recurring tasks. 677 more words


An Introduction to Scheduling Tasks in WordPress

Insights into WP-Cron: An Introduction to Scheduling Tasks in WordPress

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Web Technology

crontab user file vs system file on linux/ubuntu

Confusing Cron? ¬†Where’s the scheduled job? User vs. System.

The system crontab is usually at /etc/crontab with files being automatically called from the /etc/cron.d directory.. 43 more words

Web Programming

Cool down aging through your diet

Remember the GlycoSENS post on negligible senescence? Just like a raw chicken gets crispy after spending 2 hours in the oven, so will our bodies “bake from within” with each decade. 381 more words

Nutrition And Fitness

Backup with rsync

rsync can be used to copy files from one machine to other over network.I use rsync over ssh to take backup of my server files.ssh is configured with public key authentication so it does not ask for password everytime when rsync starts.I scheduled it as cron job so it runs every night.rsync does incremental copy so it saves time and network bandwidth. 143 more words


how to manage exim

I compiled the list from various sites and also wrote some of my own.

Prefer gist? here is the link

* Print a count of the messages in the queue:

    `exim -bpc`

* How to resend frozen messages in exim4 queue

    `exim -bp | grep frozen | awk '{print $3}' | xargs exim -v -M`

* Print a listing of the messages in the queue (time queued, size, message-id, sender, recipient):

    `exim -bp`

* Information about all the messages on the queue:

    `exim -bp | less`

* Print a summary of messages in the queue (count, volume, oldest, newest, domain, and totals):

    `exim -bp | exiqsumm`

* Print what Exim is doing right now:


* Remove frozen emails

    `exim -bpr | grep frozen | awk '{print $3}' | xargs exim -Mrm`

* Force delivery of one message

    `exim -M email-id`

* display emails with particular email address

    `exiqgrep -i -f (MAIL ADDRESS HERE) | xargs exim -bpr`

* Remove emails with particular email address

    `exiqgrep -i -f email_address_here | xargs exim -bpr | awk {'print $3'} | xargs exim -Mrm`

* How many Frozen mails on the queue

    `exim -bpr | grep frozen | wc -l`

* View the log for the message. 497 more words

Crontab - Quick Reference


cron is a unix, solaris utility that allows tasks to be automatically run in the background at regular intervals by the cron daemon. These tasks are often termed as cron jobs in unix , solaris. 738 more words