Linux

Set Up a Cron Job in Linux

Introduction

The Cron daemon is a built-in Linux utility that runs processes on your system at a scheduled time. Cron reads the crontab (cron tables) for predefined commands and scripts.

By using a specific syntax, you can configure a cron job to schedule scripts or other commands to run automatically.

This guide shows you how to set up a cron job in Linux, with examples.

Prerequisites

  • A system running Linux
  • Access to a command line/terminal window (Ctrl–Alt–T or Ctrl–Alt–F2)
  • A user account with root or sudo privileges

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Knowledge

No. Is Not the Abbreviation of Number

Quotation from www.quora.com
The abbreviation “no.” for the word “number” comes from the numero symbol, № (also written as “No.” or “no.”), which is in turn derived from Latin numero. As you can see, it has an “o” in it.

Then do you know by the way, what the abbreviations of e.g., i.e., etc., are derived from?

i.e. is abbreviation of Latin expression of id est, which means “that is” in Latin. It introduces a rewording or a clarification of a statement.

e.g. is abbreviation of exempli gratia in Latin, which means “for example” or “for instance”. It introduces one or more examples that illustrate something stated.

etc. is abbreviation of et cetera in Latin phrase, which introduces a number of unspecified additional items (persons or things).

Linux

Manage Disk Quota Step by Step

Enable Quota

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% cat /etc/fstab

#
# /etc/fstab
# Created by anaconda on Fri Jul 26 19:45:28 2019
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/vg_chipgun0/lv_root		/		ext4	defaults	1 1
UUID=1d4e1b07-4ab2-46d0-989d-95968627ffa0 /boot                   ext4    defaults        1 2
UUID=7738-A39E          /boot/efi               vfat    umask=0077,shortname=winnt 0 0
/dev/mapper/vg_chipgun0-lv_swap swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
/t/iso/rhel-server-6.10-x86_64-dvd.iso	/t/iso/loop		iso9660 defaults,ro,loop 0 0
UUID="4bcb3b77-8b05-416e-8650-dad4cb38f8ca" /p                   xfs    defaults        0 0
UUID="1298f072-6db9-46a5-8129-89a40d5fc14f" /l                   xfs    defaults        0 0
UUID="bb8414b8-181f-43ef-a8f4-0e21841ef4a0" /h                   xfs    defaults        0 0
UUID="90359d7e-0ad8-41f6-83f1-a168e27c11b3" /p/w   xfs  defaults,usrquota,grpquota      1 2

Looking at the last line of /etc/fstab above, both usrquota and grpquota are added in option domain.

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