-b FILE (conditional operator)

true if the file is a block special file. Such a file is also known as “block device”.

Links

• Block devices on Wikipedia
• Bash manual
• POSIX specification of test

Examples

Different ways to test if a file is a block special file:

1 2 3 4

test -b /dev/sda && echo "block device" [ -b /dev/sda ] && echo "block device" # Bash [[ -b /dev/sda ]] && echo "block device"