Bash script to send messages to Microsoft Teams

Copy and save into teams.sh file. Make executable. Change web hook, Run!

The script is a modified Slack script from off the web.

#!/bin/bash
# bash script to send messages to Microsoft Teams.
function usage {
echo "HELP ME!"
echo "description: send messages to Microsoft Teams channels"
echo "special notes: You'll need to change the teamsUrl variable to contain your webhook from Teams."
echo "usage: ${0} -b \"Message contents\""
echo " -m Message body"
echo " -h This help info"
exit 1
}
while getopts "m:h" opt; do
case ${opt} in
m) msgBody="$OPTARG"
;;
h) usage
;;
\?) echo "Invalid option -$OPTARG" >&2
;;
esac
done
# Add/Change the webhook to one you created in Teams
teamsUrl="https://teamswebhook"
if [[ ! "${msgBody}" ]]; then
echo "You didn't specify a message!"
usage
fi
read -d '' payLoad << EOF
{
"text": "${msgBody}",
}
EOF
statusCode=$(curl \
--write-out %{http_code} \
--silent \
--output /dev/null \
-X POST \
-H 'Content-type: application/json' \
--data "${payLoad}" ${teamsUrl})
echo ${statusCode}

Bash script to monitor system service

This bash script runs and checks to see if a service like httpd, or mysql is running and alerts if it is not.

Script Usage

servicemonitor.sh httpd mariadb

Where httpd and mariadb are the services you want to monitor/check.

Setup Script

Create servicemonitor.sh file and paste the following contents in.

#!/bin/bash

timeHour=`date +%H` # date/time just shows the hour
quietHour="02"    # If it is this hour, then exit program, useful if services are expected to go down during a particular time for maintenance
if ( echo ${timeHour} | grep ${quietHour}); then
         echo "Is during quiet time.  Quiting."
         exit
fi

 function ALERT {
 msg="~/teams.sh -b"  # Sends a message to Microsoft Teams channel.  Needs the teams.sh script in the users home directory.
 ${msg} "$1"
 }
 function SERVICECHECK {
 serviceName="${1}"
 if (systemctl status ${serviceName} | grep Active | grep inactive); then
         ALERT "ERROR: $(hostname) - ${serviceName} - ${0} is inactive"
         echo "ERROR: ${serviceName} is inactive!"
 else
         echo "Running!"
 fi
 }
 for i in $@
 do
 echo Checking ${i}
 SERVICECHECK ${i}
 done

Note the teams.sh script that is called is another script that is called that sends an alert to Microsoft Teams. Is not needed for this script to run, but allows for remote alerting.

Save file and make it executable

chmod +x servicemonitor.sh

Add script to crontab (Optional)

crontab -e

The following runs the script every 5 minutes. Can change the 5 to 1 to run every minute. Change httpd and mariadb to the service you want to monitor.

*/5 * * * * /home/UserName/servicemonitor.sh httpd mariadb

Delete anonymous MySQL user

Log into mysql

mysql -u root -p

List users

select User,Host from mysql.user;

Should return something like the following

MariaDB [mysql]> select User,Host from user;
+----------+-----------------------+
| User | Host |
+----------+-----------------------+
| root | 127.0.0.1 |
| librenms | localhost |
| | localhost.localdomain |
+----------+-----------------------+
3 rows in set (0.00 sec)
MariaDB [mysql]>

Delete anonymous user

Note that there are two single quotes ‘ before the @ sign, not a double quote “

drop user ''@'localhost.localdomain';

LibreNMS enable RRDCached on CentOS 7

Commands from https://docs.librenms.org/Extensions/RRDCached/

Create System Service

sudo vi /etc/systemd/system/rrdcached.service
[Unit]
Description=Data caching daemon for rrdtool
After=network.service
[Service]
Type=forking
PIDFile=/run/rrdcached.pid
ExecStart=/usr/bin/rrdcached -w 1800 -z 1800 -f 3600 -s librenms -U librenms -G librenms -B -R -j /var/tmp -l unix:/run/rrdcached.sock -t 4 -F -b /opt/librenms/rrd/
[Install]
WantedBy=default.target

Save with esc + :wq

Enable rrdcached service on boot up and start the service now

systemctl enable --now rrdcached.service

Enable RRDcached in librenms config

vi /opt/librenms/config.php

add/edit the following line. If it is commented out, uncomment it

$config['rrdcached'] = "unix:/run/rrdcached.sock";

Save with esc + :wq

Check the disk IO after a little bit to see if it went down.

VIM/SED Search and replace lines that do not contain numbers

Objective: Find all lines in a file that only contain alpha characters and delete or replace.

Sample contents of file.

 Z2j2NH23
VTQnPwSS
hFbxgvFt
VSVR8v3F
GPrP4zo

The following sed command works for our objective.

sed s/[[:alpha:]]\{8\}/ALPHAONLY/g file.txt

The part in the [] tells sed to search for any alpha characters a-Z, the part in bold \{8\} tells it to search 8 spaces out (Change if needed) and ALPHAONLY is what alpha line will get substituted to.

sed s/[[:alpha:]]\{8\}/ALPHAONLY/g



Returns

Z2j2NH23
ALPHAONLY
ALPHAONLY
VSVR8v3F
GPrP4zo9

You can run the same basic syntax in VI

Search and replace

:%s/[[:alpha:]]\{8\}/ALPHAONLY/g 

Or to delete the lines

:%d/[[:alpha:]]\{8\}/d

You can also change [[:alpha:]] for [[:digit:]] if you want to search for numbers instead.

Backup Android with adb on Windows

Install SDK

Install Android Studio. This will install the SDK and tools like adb and fastboot

Download from here

To run adb, you’ll need to be in the same directory as it, so open a Command Prompt and cd to the following directory.

cd %APPDATA%..\Local\Android\Sdk\platform-tools

Full directory path is

C:\Users\UserName\AppData\Local\Android\Sdk\platform-tools

Backup Android

On your Android device you will need to enable USB debugging from the developer options. Enable the developer options if you have not already.

When you plug your phone in it should ask you to Allow USB debugging. Hit OK to enable it.

Now run the backup command from your computer. Replace UserName with your computers User Name

adb backup -apk -obb -shared -all -f \Users\UserName\Desktop\android-backup.ab

On your phone you should get a window that shows Full Backup

Add optional password for backup and hit “Back up my data on phone”

Now Wait for it to finish…

Restore Backup

adb restore C:\Users\UserName\android-backup.ab

Should get a restore window on your phone, hit restore and wait.

Errors

error: device unauthorized.
This adb server's $ADB_VENDOR_KEYS is not set
Try 'adb kill-server' if that seems wrong.
Otherwise check for a confirmation dialog on your device.

USB Debugging is not allowed for computer. Try replugging the USB cable and accepting the USB Debugging.