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Linux Disk and Memory

df, du, free when disks fill or RAM runs out.

  • df du
  • disk full
  • free memory
  • inodes
  • lsof

Linux Disk and Memory

df, du, free when disks fill or RAM runs out.

Commands

CommandWhat it does
df -hFilesystem usage, human readable
du -sh top dirs, sortedTop-level disk hogs
free -hRAM and swap overview
vmstat 1 5CPU, memory, IO snapshot
lsof +L1Deleted but still-open files

Example

df -h
df -i  # inodes can fill before bytes
du -sh /var/log/* | sort -h | tail

FAQ

df full but du small - why?

Deleted files held open by processes, or exhausted inodes from millions of tiny files.

Swap at 100 percent - panic?

Check what swapped and whether the OOM-killer logged victims in dmesg.

الأسئلة الشائعة

df full but du small - why?
Deleted files held open by processes, or exhausted inodes from millions of tiny files.
Swap at 100 percent - panic?
Check what swapped and whether the OOM-killer logged victims in dmesg.

Linux

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Navigate, create, move, and inspect files with core commands.
Linux Permissions
Read ls output, chmod, chown, and sudo without breaking access.
Linux Text Processing
cat, head, cut, sort, uniq, and awk for daily data shaping.
Linux grep and find
Find files by name, age, and size; search inside them fast.