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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"

mailx to send mails from console
It is the best way i found to send a mail from the console in my centos server.

Check wireless link quality with dialog box
The variable WIRELESSINTERFACE indicates your wireless interface

copy ACL of one file to another using getfacl and setfacl

Eavesdrop on your system
This command takes a snapshot of the open files for a PID 1234 then waits 10 seconds and takes another snapshot of the same PID, it then displays the difference between each snapshot to give you an insight into what the application is doing.

Find the package that installed a command

To create files with specific permission:

Extract raw URLs from a file
you can also use cut instead of awk. less powerful but probably faster. ;)

Display a block of text with AWK

a function to find the fastest DNS server
http://public-dns.info gives a list of online dns servers. you need to change the country in url (br in this url) with your country code. this command need some time to ping all IP in list.


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