Friday, March 3, 2017

Run My Script: AIDE and Rkhunter Using Cron

ALL ABOUT PATHS

I have to set my path so the system can "see" or search in the right directory. By default the system will look at the usual directory (/usr/bin;/usr/sbin), I 've decided to put my scripts in my home directory in a folder named scripts. Or just name it bin. I edited my ~/.bash_profile and added this line.

export PATH=$PATH:/path/to/script/directory

While at it and editing this file, you might want to set your text editor of choice. I'm using GNOME so I have gedit and nano.

export EDITOR="$(if [[ -n $DISPLAY ]]; then echo 'gedit'; else echo 'nano'; fi)"

Save and close the file. You need to logout and login to get the changes running. Or you can use the source command. It returns true or an error in your syntax, in which case you should fix it.

$ source ~/.bash_profile



RUN A BASIC SCRIPT

Compose a basic script like printing 'Hello World' in the terminal just to have a feel of running a script. In your text editor type:

#! /bin/bash
#  My first script

echo  "Hello World!"

EOF

Close and save. Then allow permissions and ownership to the file so it can be run by user. Use the commands chown and / or chmod.


INSTALL CRON AND USING CRONTAB

Use pacman to download and install cronie from the main repository. Use systemd to start and enable the service. Cron schedules jobs and automate running processes. By default it sends mail to User when it runs a job in the crontab. Some services are handled by systemd already, for others, User must schedule them.

List of Crontab Commands
crontab -l #list crontabs
crontab -e #edit crontab file in your set EDITOR
crontab -r #removes crontab

Syntax for Crontab jobs
(Minute)0-59 (Hour)0-23 (Day of the Month)1-31 (Month)1-12 (Day of the Week)0-6 command to be executed

A Few Examples:
10 15 * * * /usr/bin/command/ #to run everyday at 3:10 pm

0 0 * * * /home/user/scripts/script-to-run #to run everyday at 12 midnight

I just substitued AIDE and Rkhunter scripts on this crontab examples. Now it's all in the scripts.
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