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Count the number of pages of all PDFs in current directory and all subdirs, recursively

check open ports without netstat or lsof

generate iso

Check if a package is installed. If it is, the version number will be shown.
If the first two letters are "ii", then the package is installed. You can also use wildcards. For example, . $ dpkg -l openoffice* . Note that dpkg will usually not report packages which are available but uninstalled. If you want to see both which versions are installed and which versions are available, use this command instead: . $ apt-cache policy python

Ping all hosts on 192.168.1.0/24
Will report back IP address's of all hosts that are UP.

apt-get upgrade with bandwidth limit
Trickle is here: http://monkey.org/~marius/pages/?page=trickle Trickle is a simple bandwidth limiter

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 pr. command in megabytes sum of deleted files that are still in use and therefore consumes diskspace

underscore to camelcase

Limit the transfer rate and size of data over a pipe
This example will close the pipe after transferring 100MB at a speed of 3MB per second.


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