The page is served over HTTPS but loads 1 resource(s) over HTTP. This may be blocked in modern browsers.
ℹ 🔵Missing HSTS
HTTP Strict Transport Security is not configured. Recommended for HTTPS sites.
ℹ 🔵Missing Content Security Policy
CSP is not configured. It helps prevent XSS attacks and content injection.
ℹ 🔵Missing X-Frame-Options
The site can be embedded in iframes by third parties (clickjacking risk).
HTTP Status Code200 HTTP VersionHTTP/1.1 HTTPS✔ Available IP Address216.105.38.11 Server Softwarenginx Compressiongzip 🔒 🟡Mixed Content (1 HTTP resources)The page is served over HTTPS but loads 1 resource(s) over HTTP. This may be blocked in modern browsers. ℹ 🔵Missing HSTSHTTP Strict Transport Security is not configured. Recommended for HTTPS sites. ℹ 🔵Missing Content Security PolicyCSP is not configured. It helps prevent XSS attacks and content injection. ℹ 🔵Missing X-Frame-OptionsThe site can be embedded in iframes by third parties (clickjacking risk).
Performance
DNS Lookup
2.5 ms
TCP Connect
137 ms
TLS Handshake
144 ms
Time To First Byte (TTFB)
420.8 ms
Content Download
0.1 ms
Total Response Time
420.9 ms
DNS Lookup2.5 ms TCP Connect137 ms TLS Handshake144 ms Time To First Byte (TTFB)420.8 ms Content Download0.1 ms Total Response Time420.9 ms
Security
HTTPS
✔ Enabled
HSTS
✘ Not configured
CSP
⚠ Not configured
X-Frame-Options
⚠ Not configured
X-Content-Type-Options
⚠ Not configured
HTTP/2
⚠ HTTP/1.1
HTTPS✔ Enabled HSTS✘ Not configured CSP⚠ Not configured X-Frame-Options⚠ Not configured X-Content-Type-Options⚠ Not configured HTTP/2⚠ HTTP/1.1
SEO Quick Check
Title
LinuxCommand.org: Learn The Linux Command Line. Write Shell Scripts.
Meta Description
LinuxCommand.org is a web site that helps users discover the power of the Linux command line.
TitleLinuxCommand.org: Learn The Linux Command Line. Write Shell Scripts. Meta DescriptionLinuxCommand.org is a web site that helps users discover the power of the Linux command line.
Detected Technologies
Technology
Google AnalyticsNginxPHP
TechnologyGoogle AnalyticsNginxPHP
HTTP Headers
Server
nginx
Date
Thu, 20 Aug 2026 01:02:14 GMT
Content-Type
text/html; charset=UTF-8
Transfer-Encoding
chunked
Connection
keep-alive
Vary
Accept-Encoding
Cache-control
max-age=3600
Expires
Thu, 20 Aug 2026 02:02:05 GMT
X-from
sfp-ioweb82-2
Content-encoding
gzip
Meta Tags
Content-Type
text/html; charset=utf-8
Description
LinuxCommand.org is a web site that helps users discover the power of the Linux command line.
Keywords
Linux command line, Linux shell scripting, GNU coreutils, Linux console, bash shell, bash shell scripting, Linux CLI
Content-Typetext/html; charset=utf-8 DescriptionLinuxCommand.org is a web site that helps users discover the power of the Linux command line. KeywordsLinux command line, Linux shell scripting, GNU coreutils, Linux console, bash shell, bash shell scripting, Linux CLI AuthorWilliam Shotts, Jr. CopyrightCopyright 2000-2026, William Shotts, Jr. Viewportwidth=device-width, initial-scale=1.0