Commands by Gunni

Commands by Gunni (2)

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Find out how old a web page is

I is for headers only s is for silence curl -Is outputs ONLY headers the pipe and grep is to filter them to Modified only.. Show Sample Output
This is sample output - yours may be different.
```
Last-Modified: Wed, 08 Feb 2012 20:14:53 GMT
```
1

curl -Is http://osswin.sourceforge.net/ | grep Mod

Gunni · 2012-05-01 21:42:42 6
Add a custom package repository to apt sources.list

">>" appends to the file ">" replaces the entire file make sure to use ">>" Show Sample Output
This is sample output - yours may be different.
```
none
```
0

sudo echo "package url" >> /etc/apt/sources.list

Gunni · 2012-05-01 21:32:51 5

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Top 10 Memory Processes (reduced output to applications and %usage only)

To have only unique lines in a file

Converts uppercase chars in a string to lowercase

Another alternative is to define a function: lower() { echo ${@,,} } lower StrinG

Clean your broken terminal

When some console full-screen program (minicom, vi, some installers) breaks down your terminal, try this command to revert all options to "sane" settings (sane is a built-in combo of a lot of stty options)

Sort output by column

(separator = $IFS)

Start dd and show progress every X seconds

Adjust "sleep X" to your needs. *NOTE: First sleep is required because bash doesn't have a "post-test" syntax (do XXX while).

Capture screen and mic input using FFmpeg and ALSA

Yet another x11grab using ffmpeg. I also added mic input to the capturing video stream using alsa. Yet I need to find out how to capture audio which is currently playing.

Detach a process from the current shell

Continue to execute the command in background even though quitting the shell.

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"

check open ports without netstat or lsof

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