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TechBytes on Linux

This is a growing list of Linux commands which might come handy for the of Linux users. 1. Found out i had to set the date like this:    # date -s 2007.04.08-22:46+0000 2. Mounting     sudo mount -t cifs // < pingable_host_or_ip > / < win_share_name > /build -o user= ,domain= ,uid=string,gid=string 3. To install linux packages from internet (ubuntu only)     apt-get install 4. To determine what ports the machine is currently listening on     netstat -an | grep -i listen | less 5. Find in files in Linux     find . | xargs grep 'string' -sl Find file names with a pattern & delete them find . -name "IMG_*(1).JPG" -delete 6. To become superuser/root     sudo -i 7. To find a running process using name ps -aef | grep "searchstring" 8. Alt + F2 opens run window in RHEL 9. To access windows share from linux smb:// /d$ 10. To know the last reboot date & time $ last reboot | head -1 ...
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Using SFTP on macOS

Method 1 SFTP (Secure File Transfer Protocol) is a secure way to transfer files between systems. macOS provides built-in support for SFTP through the terminal, and you can also use third-party tools for a graphical interface. Method 1: Using Terminal (Built-in SFTP Client) Open Terminal Launch the Terminal app from Applications > Utilities or by searching for it in Spotlight. Connect to the Server Use the following command to initiate an SFTP session: sftp username@hostname Replace username with your server username and hostname with the server's IP address or domain. Authenticate Enter your password when prompted. Transfer Files Use these commands to manage files: Upload a file: put /path/to/local/file /path/to/remote/destination Download a file: get /path/to/remote/file /path/to/local/destination List files: ls Exit SFTP session: exit Method 2: Using FileZilla (Graphical Interface) Download and Install FileZilla Download FileZilla Client for macOS from FileZilla's official...

Issue while pasting from the Windows clipboard into a PuTTY vi or vim terminal

  Pasting from the Windows clipboard into a PuTTY  vi  or  vim  terminal can sometimes be problematic, particularly with newer  vim  versions that have mouse mode enabled by default.  This can lead to unintended visual mode activation or incorrect pasting. Here are the primary methods to paste from the clipboard into a PuTTY  vi / vim session: Shift + Right-Click:   Shift + Insert:   Middle Mouse Button (Wheel Click):   Disable  vim  Mouse Mode (if applicable):  vim  Paste Mode:  Note: Ensure  vi  or  vim  is in insert mode (by pressing  i ) before attempting to paste if you want the content to be inserted directly into the file.  Otherwise, pasting might be interpreted as  vim  commands. For larger pastes,  vim 's paste mode can be helpful.  Enter insert mode in  vim , then type  :set paste  and press  Enter .  Paste your conten...

What caused the AWS outage that broke the internet on Oct 21st 2025

AWS outage 2025 : More than 1,000 services were impacted by the outage, including popular platforms like WhatsApp , Snapchat and Reddit , which rely on AWS services, along with financial institutions like the British government’s tax services and entertainment services In India, the impact of the outage was most pronounced in the aviation sector, with hundreds of flights delayed and several cancelled as airline operators found their systems inoperational and had to switch to manual processes. At least ten banks and NBFCs had “minor disruptions”, which have either been resolved or are being resolved, the Reserve Bank of India said at the time. Here is a technical explanation for the AWS Outage due to a DNS failure . AWS's own internal control plane is built on top of DynamoDB . It's a hidden dependency. When AWS's internal services couldn't find the IP for DynamoDB, the entire management layer collapsed. Stage 1: DNS Fails. The internal DNS servers for dynamodb.us-eas...

How to show hidden folders in Mac OS in Finder

  To show hidden files and folders on a Mac,  open Finder and press the Command (⌘) + Shift + Period (.) keys simultaneously .  The hidden files will appear with a faded or semi-transparent look.  To hide them again, press the same keyboard shortcut.   Using the Keyboard Shortcut Open any Finder window.   Navigate to the folder where you want to view hidden files, such as your Macintosh HD folder.   Press and hold the Command, Shift, and Period keys all at the same time.   Hidden files and folders will appear.   To hide them again, repeat the same key combination.   Using Terminal (Alternative Method) Open Terminal by searching for it in Spotlight (magnifying glass icon).   Enter the following command and press Return:  defaults write com.apple.finder AppleShowAllFiles YES .   Hold down the Option key, right-click the Finder icon in the Dock, and select Relaunch to apply the changes.   To hide all files again, you can...

How to remove the bash history from a Linux Terminal

Removing bash history in the terminal can be done in several ways, depending on whether you want to clear the current session's history, remove specific entries, or clear the entire history file. 1. Clear the current session's history: To clear the history of commands in the currently running shell session, use: ಕೋಡ್ history -c This command clears the in-memory history for the current session but does not affect the ~/.bash_history file until the session exits (and even then, it will only write the current, now empty, history). 2. Remove specific entries from history: To remove a specific command from the history, first, identify its line number using the history command. Then, use: ಕೋಡ್ history -d <line_number> Replace <line_number> with the actual line number of the command you wish to remove. To make this change permanent in the ~/.bash_history file, you need to write the current history to the file afterwards: ಕೋಡ್ history -w 3. Clear the entire bash history...