tcptrack

A quite handy tool for monitoring tcp traffic is tcptrack. Get it with:

and start it with

the interface parameter -i eth0 must be according to your needs, you can check your interfaces with ifconfig.

There is also tcpdump, tcpflow and other nice tools

Netstat

Sometimes one like to figure out what programs listen at a port. Here we can get an overview with:

Where t=tcp, u=udp, p=show program name, l=show listening ports, n= numeric (not resolve machine names)
The Output could look something like this:

 

lsof

With lsof you can determine easily which program listens on a port and under which user that program runs:

 

MTA stands for „mail transfer agent“. Popular ones are sendmail, exim and postfix.

If you want to know what MTA is running locally you can check which program listens on port 25:

You might also telnet on port 25 and let the MTA himself respond who he is:

 

For configuring exim4 the preferred way is to use the graphical interface, call it with:

 

 

Some usefull commands:

change your nick

List channels on current server

Join a channel named „channelname“

Leave a channel

 

Veröffentlicht unter bitchx.

Easiest way to check a connection for a MSSQL database:

Create a file called : myfile.udl

Paste the following content (make sure to use your settings):

 

Veröffentlicht unter mssql.

Do you want to know how often words occur in a pdf file? And sort them by the most occurring word:

Let’s break it down step by step:

displays the pdf content on the command-line

 

replaces all control characters (cntrl), all numbers (digits) and all punctuation characters (punct) with an empty string.
See here for character classes.

replaces all spaces with a newline

 

The last part sorts the output, groups unique lines and prefix them with the amount and finally sort them again
with ignored leading blanks (-b), sort numeric (-n), in reverse order (-r)

Veröffentlicht unter pdf.

Let’s have a look which packages are already installed and show only those with „php“ in the name. A fresh system usually shouldn’t give any results.

Next you can check what kind of modules are available. Do it like this:

Now install the php7 base packages with the command:

Now install some other packages for php:

 

Try this out:

 

Veröffentlicht unter linux.

 

Veröffentlicht unter git.

Sometimes it happens that you can’t use your services cause they deal with blocked ports. For exampel you use mysql on the commandline and it is by some reason denied. A proxy can help you. Tsocks helps you to use a proxy. Tsocks is a library for intercepting outgoing network connections and redirecting them through a SOCKS server.

install tsocks with

Configure the file /etc/tsocks.conf

and finally call your command like this: