gnu_dev_major - Linux
Overview
gnu_dev_major is a utility that provides the major device number for a given block or character device. It is commonly used in scripting and kernel debugging.
Syntax
gnu_dev_major <device_path>
Options/Flags
None
Examples
- Get the major device number for the
/dev/sdadrive:
gnu_dev_major /dev/sda
- Use the major device number in a script:
major=$(gnu_dev_major /dev/sda)
echo "Major device number: $major"
Common Issues
- Ensure that the specified device path exists and is accessible.
Integration
gnu_dev_major can be used in conjunction with other commands to manipulate device files. For example, it can be used to check if a device is present before attempting to access it:
if [ -b /dev/sda ] && gnu_dev_major /dev/sda > /dev/null; then
# Device is present, do stuff
fi