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Linux Survival Basics

Read-only, can be slow

Find Apache DocumentRoot and Directory Rules

You need DocumentRoot and access-control directives from enabled Apache config.

Command

grep -RInE 'DocumentRoot|<Directory|Require all|Options|AllowOverride' /etc/apache2/sites-enabled /etc/apache2/conf-enabled /etc/httpd/conf.d 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 chmod the web tree before checking the Directory and Require rules.

Expected output

Matching config lines with file names and line numbers.

System impact

Read-only, can be slow. Nothing changes. The command reads current state and prints diagnostic evidence.

May require elevated permissions on protected paths or service-owned files.

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

Recovery / rollback: no state is changed.

When to use it

Use when Apache returns 403 for a path that appears to exist.

When not to use it

Do not chmod the web tree before checking the Directory and Require rules.

Common misread

Do not chmod the web tree before checking the Directory and Require rules.

Example run

Commands shown

These are the commands shown for inspection. Treat them as an example, not proof that your system will behave identically.

  1. grep -RInE 'DocumentRoot|<Directory|Require all|Options|AllowOverride' /etc/apache2/sites-enabled /etc/apache2/conf-enabled /etc/httpd/conf.d 2>/dev/null
  2. grep -RInE 'DocumentRoot|<Directory|Require all|Options|AllowOverride' /etc/apache2/sites-enabled /etc/apache2/conf-enabled /etc/httpd/conf.d 2>/dev/null

next steps

Related commands

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One deny or alias can explain the whole 403.

grep -RInE 'root|alias|deny|allow' /etc/nginx/sites-enabled /etc/nginx/conf.d 2>/dev/null
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Find Nginx SSL Certificate Directives

The wrong certificate is often in the server block.

grep -RInE 'ssl_certificate|ssl_certificate_key|server_name' /etc/nginx/sites-enabled /etc/nginx/conf.d 2>/dev/null
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List Enabled Apache Sites

Apache may not be using the vhost file you edited.

find /etc/apache2/sites-enabled -maxdepth 1 -type l -printf '%f -> %l ' 2>/dev/null | sort
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Find Apache Document Roots

Apache was serving files from a different directory than expected.

grep -RInE '^[[:space:]]*DocumentRoot[[:space:]]' /etc/apache2/sites-enabled 2>/dev/null
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Map Apache Virtual Hosts

Apache chose a virtual host. You need to know which one.

grep -RInE '<VirtualHost|ServerName|ServerAlias' /etc/apache2/sites-enabled 2>/dev/null

next diagnostic step

Where to go from this command

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.