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Linux

nmap

nmap -sS 1.2.3.4 nmap -PN 1.2.3.4 -p 22 The -PN option treats the host as if it is online and will not perform any host discovery.

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Linux

curl

curl -I http://pikedom.com http://curl.haxx.se/docs/httpscripting.html https://httpkit.com/resources/HTTP-from-the-Command-Line/ http://www.yilmazhuseyin.com/blog/dev/curl-tutorial-examples-usage/

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Linux

locate

The locate command can be used to find files by name. As usual you can find out everything you could possibly want to know about the the locate command in the manual pages. man locate […]

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Linux

find

You can use the find command to search a system for files or directories. The find command can be quite resource intensive as it trawls recursively through your file structure. Often a more suitable command […]