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    • Application Notes Linux (with sample terminal commands)

    Owned by Albinleo Velappan (Deactivated)
    Last updated: 23. Jan 2023 by Sven Hillger
    2 min read

    Howto... (unordered)

    Set Backlight Brightness

    $ echo X > /sys/class/backlight/backlight/brightness

    X: Value 0..100

    List Block Devices (incl. mountpoint)

    $ lsblk

    Example output:

    NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 1 14.6G 0 disk `-sda1 8:1 1 14.6G 0 part /run/media/sda1 mmcblk0 179:0 0 7.1G 0 disk |-mmcblk0p1 179:1 0 500M 0 part /run/media/mmcblk0p1 `-mmcblk0p2 179:2 0 6.6G 0 part / mmcblk0boot0 179:32 0 4M 1 disk mmcblk0boot1 179:64 0 4M 1 disk mmcblk0rpmb 179:96 0 4M 0 disk

    List USB Devices

    See 'lsusb –help' for options; i.e. -v for verbose output.

    List PCIe Devices

    See 'lspci –help' for options; i.e. -v for verbose output.

    Change Terminal Output Length

    Useful to view logs or enter commands in terminal window without having the line-wrap/cut after 80 characters.
    i.e. set to 1000 characters:

    i.e. check window-size of serial-terminal:

    Using Serial (tty) in Linux

    To identify usably serial ports use:

    Configuration and terminals:

    • setserial

    • cu; i.e. cu -l /dev/ttyS0 -s 115200

    • screen

    • minicom

    • putty

    • tip

    When accessing a serial port i.e. /dev/ttyS0 or /dev/ttyUSB0 (FTDI) , you may get a /dev/ttyS0: Permission denied error.
    A way around this is to add yourself to the tty and dialout group:

    You will need to properly logout and login again for changes to take effect.

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