How To Preserve Quotes In Bash Arguments

Author: , April 18th, 2022

If you want to preserve quoting to pass shell arguments to a called command, use the four characters “$@” (including the double quotes) instead of the two characters $*

How To Disable Email Bounce Messages In Postfix

Author: , March 18th, 2022

How To Fix Server Ownership When Files Have Been Altered By Mistake

Author: , March 16th, 2022

Situation: Newbie mistake, used copy-and-paste to create a script that used variables with the incorrect variable name, then ran chown -R / OUCH Resolution: Since I had aa clone host nearby, I decided to export the remote root fs via NFS, mount it on the fouled nnode, and use find magic to repair. Here are […]

How To Solve Grafana Error “failed to load its application files”

Author: , February 23rd, 2022

Try a newer browser before anything else! I was using an older version of Safari on Mac and got this:

I switched to the latest version of FireFox and was fine.

How To Prevent SSH From Prompting When The Host Is Unknown

Author: , January 26th, 2022

If you are asked “Are you sure you want to continue connecting (yes/no)?” when trying to connect via SSH, then the remote host’s identification key has not yet been stored in your ~/.ssh/known_hosts file. This then requires you to type the full string “yes” in order to proceed because the default value for ssh is […]

How To Block Email Using Subject Headers In Postfix

Author: , December 7th, 2021

I needed to block email based on the Subject header. The solution is simple: Edit main.cf as root and uncomment or add:

Next, creaate or edit /etc/postfix/header_checks as root and add the following line:

Finally, run sudo postfix reload NOTE: Do NOT add the “i” after the regular expression! It is case-insensitive by […]

How To Enable Focus Follows Mouse On MacOS

Author: , December 2nd, 2021

Use AutoRaise! From the docs: “When you hover a window it will be raised to the front (with a delay of your choosing) and gets the focus.” Web page: https://github.com/sbmpost/AutoRaise Download: https://github.com/sbmpost/AutoRaise/archive/refs/heads/master.zip

My ~/.AutoRaise file:

How To Bounce the Dock Icon For All Incoming Email on MacOS

Author: , November 2nd, 2021

I needed a way to get the dock icon to bounce for all incoming emails and there did not seem to be any option to do so. There is actually a simple way to do it, but it is not intuitive. The key is to add a new Rule! Open Mail.app and choose Mail -> […]

How To Sync AWS S3 Buckets Using RClone

Author: , September 9th, 2021

The aws s3 sync command is slow and painful! I needed a more efficient way to sync to large buckets (prod to dev). Finally settled on RClone: https://rclone.org/docs/

During rclone config I called remote “s3” ;-}

How To Get A Reverse DNS Lookup On The Command Line

Author: , September 1st, 2021

There are three commands in Linux to easily get a reverse DNS lookup with: dig, host and nslookup. Here are examples of each: shell> dig -x 3.214.2.238 +short

shell> dig -x 3.214.2.238

shell> host 3.214.2.238

shell> nslookup 3.214.2.238