Commands by looneyhans (0)

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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Using NMAP to check if a port is open or close
Using NMAP to check to see if port 22(SSH) is open on servers and network devices.

list block devices
Shows all block devices in a tree with descruptions of what they are.

Create a QR code image in MECARD format
Add the QR code image on your webpage, business card ., etc, so people can scan it and quick add to their Contact Address Book. Tested on iPhone with QRreader.

check open ports without netstat or lsof

how to allow a program to listen through the firewall
To allow a program ("programmaautorizzato" in example) to listen through the firewall

Create a random file of a certain, and display progress along the way.
SIZE is the number of gigabytes and the file name is at the end. Random data is generated by encrypting /dev/zero, similar to other techniques posted on here.

Ultra fast public IP address lookup using Cloudflare's 1.1.1.1

Display the human-readable sizes of all files and folders in the current directory with 3 decimal places
To sort the list by file/directory size, insert `sort -n |` before `awk`.

Given process ID print its environment variables

translate what is in the clipboard in english and write it to the terminal


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