Joe, a user, reports that he is no longer able to write files to his home directory. Upon inspection, the Linux administrator discovers that attempting to create a new file gives the following error:

rm -Rf ~/.* forcibly deletes all hidden files and directories in the home directory, which is a destructive action that addresses disk block usage rather than inode exhaustion, and should not be used before the root cause has been confirmed.

fsck -y /dev/sda1 performs a filesystem consistency check with automatic repair, but it must not be run on a currently mounted filesystem and is inappropriate as an initial troubleshooting step when inode exhaustion - not filesystem corruption - is the likely cause.

df -i displays inode statistics for each mounted filesystem including total inodes, used inodes, free inodes, and percentage used - this directly identifies inode exhaustion as the root cause when disk block usage is normal, and is the appropriate next troubleshooting step given the symptoms described.

fdisk /dev/sda is a partition management utility for creating, deleting, and resizing disk partitions, and is entirely unrelated to diagnosing or resolving a 'no space left on device' error caused by inode exhaustion.