replace.sh | A simple find and replace command generator | Frontend Framework library

I've a file inside which I have a placeholder text for a password. I'm now trying to find and replace the placeholder text with the actual password. The text looks like below:

I have to use 3 processes in order to solve the problem. First processes gets input from (entered via keyboard) and sends it to the second procces The second process replaces all the vocals from the text with 12345 (a with 1, e with 2, ...). I got a well working sh script (tested it) that uses sed to do this task. I will put it here. Thrid process outputs on the screen only the alphanumeric lines. I also got a script that uses grep to do this task and also works fine (tested it). This processes should communicate trough a named pipe (a FIFO file) and i'm running into some difficulties sending and receiving the data trough the FIFO. When i use the write function to write the data to the FIFO it outputs the data on the screen and when i'm in the second process and i try to read the data from the FIFO it just waits for a new input entered by me.

First process:

I have created a script to automatically switch my Spotify UI from a light-theme to a dark-theme using Spicetify. The code for this script can is found here,

After adding anchors to my bitbucket-pipelines.yml file I got:

CONFIGURATION ERROR The 'master' section in your bitbucket-pipelines.yml file is missing a 'step'. Please add the missing 'step' to fix the error.

But, according to https://bitbucket-pipelines.prod.public.atl-paas.net/validator, the config is VALID

I'm trying to leverage the Jenkins credentials plugin to store sensitive data which I want to inject into Secrets within my Kubernetes cluster. I have a JenkinsFile which is used in my project to define the steps and I've added the following code to pull a username/password from a credential and pass to shell script to replace a placeholder in a file with the actual file: