Archive | NoteToSelf

How to find the Raspberry Pi model

By jbmurphy on July 19, 2023 in NoteToSelf, RaspberryPi

Note to self:

How to find the Raspberry Pi Model :

cat /proc/device-tree/model

Quickly find that new Raspberry Pi’s address

By jbmurphy on December 9, 2020 in Linux, NoteToSelf

Saw this the other day, and I wanted to post it, so that I can remember it.

How to find a Raspberry Pi’s DHCP address:

arp -na | grep -i "b8:27:eb"

vim: How to stop the tab annoyingness when you paste

By jbmurphy on January 8, 2019 in Linux, NoteToSelf

This is a NoteToSelf. Often I paste into VI/VIM, and the tabs go crazy and fly across the screen, leaving the text starting in the middle of the line. Then next line is even further! I can never remember how fix the issue.

To fix:

:set paste

Note to self: cURL with data-urlencode for GET/QuerySting values

By jbmurphy on December 18, 2018 in Linux, NoteToSelf, ShellScript

I know I would loose this if I didn’t blog it.
With cURL, you can use “–data-urlencode” with query string params and a GET if you include the “-G” parameter. Of course you still have to escape things out, I just found it easer to add all the QueryString params separately. All the examples I could find were for POSTs.

FILTER="ReallyLongStringWIth"$VARS" SPACES and ' SINGLE quotes and a &"
curl -s -G --header "authorization: Bearer $TOKEN" --data-urlencode "\$filter=$FILTER" --data-urlencode "api-version=2016-09-01" $URL

My SSL/Certificate Cheatsheet

By jbmurphy on February 17, 2017 in Linux, NoteToSelf

Whenever a certificate needs to be renewed, I always have to scramble to remember how to update/renew. I finally put a cheat sheet together.

I decided I will do all cert related stuff form Linux. Here are some commands:

To request a new csr with a new key:

openssl req -newkey rsa:2048 -keyout yourcompany.com.key -out yourcompany.com.csr

Generating a 2048 bit RSA private key
.............................................................................................+++
.............+++
writing new private key to 'stratgovadvisors.com'
Enter PEM pass phrase:
Verifying - Enter PEM pass phrase:
-----
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:US
State or Province Name (full name) [Some-State]:New York
Locality Name (eg, city) []:New York
Organization Name (eg, company) [Internet Widgits Pty Ltd]:Your Company name
Organizational Unit Name (eg, section) []:IT
Common Name (e.g. server FQDN or YOUR name) []:*.yourcompany.com
Email Address []:

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:

To request a new csr with an existing key:

openssl req -new -key yourcompany.com.key -out yourcompany.com.csr

To make a PFX form a Private key and a cert:

openssl pkcs12 -export -out yourcompany.com.pfx -inkey yourcompany.com.key -in yourcompany.com.crt

To extract Private key and Cert from a PFX (3 steps)

Export the private key

openssl pkcs12 -in yourcompany.com.pfx -nocerts -out yourcompany.com.pem -nodes

Export the certificate

openssl pkcs12 -in yourcompany.com.pfx -nokeys -out yourcompany.com.crt

Remove the passphrase from the private key

openssl rsa -in yourcompany.com.pem -out yourcompany.com.key

When using PowerShell to pull REST data from MS CRM, escape `$filter !

By jbmurphy on September 28, 2016 in MicrosoftCRM, NoteToSelf

Note to self.

When trying to filter a REST response in PowerShell, by using the “$filter” parameter in the url (as with MS CRM 2011), you must escape the “$” with “`$”.

For example:

Does not work:
$url=”http://crmserver.company.com/Organization/xrmservices/2011/OrganizationData.svc/ContactSet$filter=StateCode/Value eq 0″

Works:
$url=”http://crmserver.company.com/Organization/xrmservices/2011/OrganizationData.svc/ContactSet`$filter=StateCode/Value eq 0″

Gets me every time, and I can’t figure out why my filters are being ignored!

Using Let’s Encrypt, cerbot-auto with Apache on CentOS 6

By jbmurphy on September 9, 2016 in Linux, NoteToSelf

There are plenty of better documented examples out there, so this is more of a note to self.

cd /opt
mkdir YourDir
cd YourDir/
wget https://dl.eff.org/certbot-auto
chmod a+x certbot-auto

/certbot-auto --apache certonly -d www.FirstDomain.com -d FirstDomain.com -d www.SecondDoamin.com -d SecondDoamin.com -d www.ThirdDoamin.com -d ThirdDoamin.com -d www.FourthDomain.com -d FourthDomain.com

The name on the cert will be the first domain you list int he command above. All the other names will be part of the SAN cert.

And to renew, cron this up:
/opt/YourDir/certbot-auto renew

Grep to Remove Spaces and Comments (#)

By jbmurphy on December 29, 2015 in NoteToSelf, ShellScript

Sometimes I just want to look at the content of a config file and not all the descriptions.

grep -v "\#\|^[[:space:]]*$"

Thawte: The state name can not be abbreviated. Gets me every time.

By jbmurphy on November 4, 2015 in NoteToSelf

Note to self: When generating a CSR for Thawte: The State Name in the CSR cannot be abbreviated

Gets me every time.

Import Picture into AD with PowerShell

By jbmurphy on March 14, 2013 in NoteToSelf, PowerShell

I know this is everywhere, so this is more a note for myself. How to upload pictures to AD via PowerShell:

Import-RecipientDataProperty -Identity username -Picture -FileData ([Byte[]]$(Get-Content -Path .\username.jpeg -Encoding Byte -ReadCount 0))

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