Commands by jonavon (2)

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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"

delete files containing matching text
-r recursively -Z zero byte after each file name instead of the usual newline -l only filenames

Restore a local drive from the image on remote host via ssh

Monitor memory usage
Monitor with watch command and vmstat, memory usage

A DESTRUCTIVE command to render a drive unbootable
Overwrites the boot sector. Since this doesn't overwrite any data, you can usually recover by re-creating the partition table exactly the same as before you zeroed it. This can also help sometimes if you install a new drive in a Windows machine which can't read it.

Analyze awk fields
Breaks down and numbers each line and it's fields. This is really useful when you are going to parse something with awk but aren't sure exactly where to start.

tell if a port is in use
if you don't do --numeric-ports, netstat will try to resolve them to names

Print all fields in a file/output from field N to the end of the line

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.

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

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