Commands by fraktil

Commands by fraktil (4)

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Remote Screenshot

Like the given command, but combines _DISPLAY=":0.0"_ with _export DISPLAY_ to get _export DISPLAY=":0.0"_ and only imports if DISPLAY is set successfully.
This is sample output - yours may be different.
-3

export DISPLAY=":0.0" && import -window root screenshot.png

fraktil · 2010-02-17 12:13:49 0
Insert the last argument of the previous command
This is sample output - yours may be different.
2

<ALT> .

fraktil · 2010-01-28 03:33:31 0
Remove newlines from output

Pipe any output to "grep ." and blank lines will not be printed.
This is sample output - yours may be different.
3

cat filename | grep .

fraktil · 2009-08-09 01:00:59 1
A fun thing to do with ram is actually open it up and take a peek. This command will show you all the string (plain text) values in ram
This is sample output - yours may be different.
6

strings /dev/mem|less

fraktil · 2009-08-09 00:56:06 0

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Download and extract a *tar.gz file with curl.

Monitor memory usage

Monitor with watch command and vmstat, memory usage

rename files according to file with colums of corresponding names

Maybe simpler, but again, don't know how it will work with space in filename.

Download all manuals RedHat 7 (CentOS/Fedora) with one command in Linux

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"

seq (argc=2) for FreeBSD

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)

Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

Set laptop display brightness

Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

run command on a group of nodes in parallel

Parallel is from https://savannah.nongnu.org/projects/parallel/ Other examples would be: (echo foss.org.my; echo www.debian.org; echo www.freenetproject.org) | parallel traceroute seq -f %04g 0 9999 | parallel -X rm pict{}.jpg

Have netcat listening on your ports and use telnet to test connection

This will start a netcat process listening on port 666. If you are able connect to your your server, netcat will receive the data being sent and spit it out to the screen (it may look like random garbage, so you might want to redirect it to a file).

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