Serial port on Linux ttyUSBx
Set the baud speed: Get the port info: Use the stty command to set the parameters of your serial something…
PostgreSQL: Password authentication failed for user “postgres”
When logging into PostgreSQL, an error message may appear like this: When PostgreSQL installs on Linux, by default no password…
PostgreSQL: Allow Remote Connection to Connect Database
When a client machine tried to connect the PostgreSQL Server, it got an error like “psql:could not connect to server:Connection…
Raspberry Pi 4 GPIO Pinout
The best thing about any Raspberry Pi, including the new Raspberry Pi 4, is that you can use it to…
Linux file permissions
The UNIX and Linux stores a set of permissions with every file.These permissions help to keep data secure on a…
