Back to commands

Hosting Operations

Read-only, can be slow

Audit a Symlink Permission Chain

You need to inspect symlink targets and every parent directory before deciding whether permissions are wrong.

Command

find /srv/www/example -type l -printf '%p -> %l\n' -exec namei -l {} \; 2>/dev/null

Before you run this

System impact: Read-only. Can create load on large logs, directories, filesystems, or process tables.

When not to use it: Do not audit only the symlink inode; access depends on the target path too.

Expected output

Each symlink target followed by namei ownership and mode details.

System impact

Read-only, can be slow. Nothing changes. The command lists symlinks and traces their resolved path components.

Scope this to the smallest useful path or service on busy systems.

Recovery / rollback: no state is changed.

When to use it

Use when current-release, shared-secret, or uploads symlinks complicate a permission issue.

When not to use it

Do not audit only the symlink inode; access depends on the target path too.

next steps

Related commands

Hosting Operations Can be slow

Find Release Files Writable Outside the Owner

A release file that someone besides the owner can modify deserves a second look.

find /srv/www/example/releases/current -type f -perm /0022 -printf '%M %u:%g %p\n' 2>/dev/null | sort
Hosting Operations Can be slow

Group Writable Files by Owning Group

Group-writable files are not automatically wrong, but the owning group decides the risk.

find /srv/www/example -type f -perm -0020 -printf '%g %M %p\n' 2>/dev/null | sort
Hosting Operations Can be slow

Find Runtime Directories Writable Outside the Owner

Runtime directories often need writes, but the write boundary should be visible.

find /srv/www/example/shared/storage /srv/www/example/shared/uploads -type d -perm /0022 -printf '%M %u:%g %p\n' 2>/dev/null | sort
Cybersecurity Triage Can be slow

Find Writable Directories Missing the Sticky Bit

A writable log directory is not the same thing as a safe shared directory.

find /srv/www/example -type d -perm -0002 ! -perm -1000 -printf '%m %u:%g %p\n' 2>/dev/null | sort
Hosting Operations Can be slow

Summarize Cache File Ages

Cache cleanup is safer when you know whether files are stale or still active.

find /var/cache -xdev -type f -printf '%TY-%Tm-%Td\n' 2>/dev/null | sort | uniq -c
Study mapping

Use this as independent command practice: read the notes, predict the output, then compare it with the example before using a real shell.

  • LPIC-1 style command-line practice
  • LFCS style performance-task practice
  • Linux+ style troubleshooting review

Independent study support only. No affiliation, endorsement, exam dumps, or real exam questions.