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Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Debug redirects between production reloads
Watches the headers of a curl, following any redirects and printing only the HTTP status and the location of the possible redirects.

Check reverse DNS
The +short option should make dig less chatty.

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

Get information about memory modules
To take information about the characteristics of the installed memory modules.

count IPv4 connections per IP
usefull in case of abuser/DoS attacks.

ls not pattern
Hides some entries from listing.

Kill any process with one command using program name
Somtime one wants to kill process not by name of executable, but by a parameter name. In such cases killall is not suitable method.

Replace spaces in filenames with underscores


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