No space left on device

ENOSPC covers two different shortages

Blocks or inodes. A directory of millions of small files exhausts inodes while reporting free gigabytes.

df -h
df -i

du -sh /var/* | sort -rh | head

lsof +L1

A log removed with rm keeps its blocks until the writing process closes it. Space appears used with no file on disk.

Scope: failure mode: ENOSPC and inode exhaustion.

CliHelper documents failure modes of third-party command line tools. No software is stored or distributed here.