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Category: Unix

Postfix SMTP relay to Office 365 - Single and Multiple SMTP Servers

Updated on: June 16, 2022 Sarav AK

Postfix is a powerful opensource mail server with a lot of customization options available built-in. I recently had a requirement to set up an Organization-wide mail server to perform SMTP relay to Office365 and allow our Java, JS, Python applications to send emails from different office365 email ids based on[...]

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Bash echo to STDERR

What is STDOUT and STDERR in Linux - echo to STDERR

Updated on: June 19, 2022 Sarav AK

Every command we run in Linux would either give output or throw an error. Sometimes we want the errors to be redirected into an output channel or you may want to redirect the STDERR to one file and STDOUT to a different file You might have come across these two[...]

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Shell Script to SSH with Password - How to Handle Password Prompt

Updated on: June 19, 2022 Sarav AK

Are you looking for a Shell Script that connects to remote server and executes some commands or another script?  Are you looking for a Shell Script which SCP files to a remote server? Are you looking for Shell Script to SSH with Password and Automatically handle the Password Prompt? Wondering[...]

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SSH without Password Key Based Authentication

How to enable SSH Key based authentication - Passwordless SSH

Updated on: June 1, 2019 Sarav AK

How to SSH without Password into remote Linux Server is the question that every Engineer working on Linux might have come across. Sometimes the Question we seek could be different like ssh command without password ssh to the remote server without password SSH without password from Shell Script SCP to[...]

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How to create ssh public key from private key - Vagrant & Linux

Updated on: June 19, 2022 Sarav AK

How to create SSH public Key from SSH private key is a question made me write this post. Though we would be able to achieve the SSH key-based authentication by producing the private key. Sometimes it is necessary that we must have the SSH public key. Especially when we are[...]

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