Commands by pawelkl (1)

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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"

Show apps that use internet connection at the moment.
This corrects duplicate output from the previous command.

netstat with group by (ip adress)
Same as the rest, but handle IPv6 short IPs. Also, sort in the order that you're probably looking for.

get all Amazon cloud (amazonws etc) ipv6 subnets

Vectorize xkcd strips
Uses ImageMagick and potrace to vectorize the input image, with parameters optimized for xkcd-like pictures.

Display which distro is installed
Works on Ubuntu

Uptime in minute
Want to run scripts/programs in the system after starting X minute [ For letting the system to free ]? This will give uptime in minute.

Compress a series of png pictures to an avi movie.
cd /path/to/your/png_pics mencoder "mf://*.png" -mf fps=2 -o output.avi -ovc lavc -lavcopts vcodec=mpeg4 then you can get a movie named output.avi.

List files size sorted and print total size in a human readable format without sort, awk and other commands.

Quickly add user accounts to the system and force a password change on first login
This command is a bit Linux specific, as --stdin doesn't exist for passwd on many Unix machines. Further, useradd is high level in most distributions and Unix derivatives except for the Debian family of distros, where adduser would be more appropriate. The last bit, with chage, will force the user to change their password on new login.

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