Commands by markdrago

Commands by markdrago (4)

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Produce a pseudo random password with given length in base 64
This is sample output - yours may be different.
3

date +%s | sha256sum | base64 | head -c <length>; echo

markdrago · 2010-04-30 22:05:11 7
simple echo of IPv4 IP addresses assigned to a machine

ifconfig is dead, long-live iproute2 this also uses only awk to do the grepping and removal of CIDR notation Show Sample Output
This is sample output - yours may be different.
```
127.0.0.1
10.3.0.43
```
0

ip addr | awk '/inet / {sub(/\/.*/, "", $2); print $2}'

markdrago · 2010-03-04 14:21:18 6
analyze traffic remotely over ssh w/ wireshark

This captures traffic on a remote machine with tshark, sends the raw pcap data over the ssh link, and displays it in wireshark. Hitting ctrl+C will stop the capture and unfortunately close your wireshark window. This can be worked-around by passing -c # to tshark to only capture a certain # of packets, or redirecting the data through a named pipe rather than piping directly from ssh to wireshark. I recommend filtering as much as you can in the tshark command to conserve bandwidth. tshark can be replaced with tcpdump thusly: ssh root@example.com tcpdump -w - 'port !22' | wireshark -k -i -
This is sample output - yours may be different.
31

ssh root@server.com 'tshark -f "port !22" -w -' | wireshark -k -i -

markdrago · 2009-12-17 23:03:24 39
Get ethX mac addresses

I much prefer using /sbin/ip over /sbin/ifconfig for most everything. I find the interface and output to be much more consistent and it has many abilities that ifconfig, route, etc. do not. To get the mac address for only one interface, add 'show dev [interface]' to the 'ip link' part of the command: ip link show dev eth0 | grep 'link/ether' | awk '{print $2}' . Also, both this command and the ifconfig one do not require root access to run, so the sudo is not necessary. Show Sample Output
This is sample output - yours may be different.
```
01:23:45:67:89:ab
```
1

ip link | grep 'link/ether' | awk '{print $2}'

markdrago · 2009-11-04 19:41:26 19

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An alarm clock using xmms2 and at

Nice little alarm clock to wake you up on time (hopefully). You can also do 'echo "vlc path/to/song" | at 6:00

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"

Create a persistent remote Proxy server through an SSH channel

Create a persistent remote Proxy server through an SSH channel.

Makes the permissions of file2 the same as file1

Also works with: $chgrp --reference file1 file2 $chown --reference file1 file2

Open a manpage in the default (graphical) web browser

An easy alias for opening a manpage, nicely HTML formatted, in your set internet browser. If you get a "command exited with status 3" error you need to install groff.

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 all local git branches that have been merged

This checks if the branch has been merged with master and then will delete the ones that have been. Keeps your local git repo nice and clean from all the branches.

Remove the first and the latest caracter of a string

Print trending topics on Twitter

list block devices

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

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