The rename(2) system call usually only works within a single ?le system. However,the mv(1) command can be used to rename a ?le between two different ?le systems. How do you think the command knows that the source and destination aredifferent ?le systems? How do you think the mv command renames a ?le between two different ?le systems

What will be an ideal response?

he command could use stat(2) and comparethe st_dev entries to see if the source and destination ?le systems are on the same device. However, the command simply calls rename(2), and if it fails with errno set to EXDEV, then the command knows the two ?le systems aredifferent. In this case, the command simply copies the ?le from the source to the destination and then removes the source copy