Commands by zyf543 (0)

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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"

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.

Isolate file name from full path/find output
Quick method of isolating filenames from a full path using expansion. Much quicker than using "basename"

Use tee + process substitution to split STDOUT to multiple commands
Using process substitution, we can 'trick' tee into sending a command's STDOUT to an arbitrary number of commands. The last command (command4) in this example will get its input from the pipe.

Generate a random password 30 characters long

Salvage a borked terminal
This works in some situations where 'reset' and the other alternatives don't.

Print a random 8 digit number

ssh tunnel with auto reconnect ability

Skip filenames with control characters, a.k.a tab,newline etc

show the real times iso of epochs for a given column
When you have one of those (log)files that only has epoch for time (since no one will ever look at them as a date) this is a way to get the human readable date/time and do further inspection. Mostly perl-fu :-/


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