Rm (command)

wikipedia:rm (Unix) is used to remove different type objects such as computer files, directories and symbolic links from file systems and also special files such as device nodes, pipes and sockets.

The rm command removes references to objects from the filesystem using the unlink system call.

Examples

rm /path/to/your/file

rm -rf

echo "" > /path/to/the/file.log

If it was already deleted, on Linux, you can still truncate it by doing:
echo "" > "/proc/$pid/fd/$fd"

rm: cannot remove 'XXXX': Read-only file system