Commands by ironmarc

Commands by ironmarc (6)

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Flush memory cache
This is sample output - yours may be different.
-3

free && sync && echo 3 > /proc/sys/vm/drop_caches && free

ironmarc · 2016-11-02 08:51:01 23
clear MyDNS-ng cache

Occasionally, to force zone updating, cache flush is necessary. This command is better than restart the mydns daemon.
This is sample output - yours may be different.
1

kill -SIGHUP `cat /var/run/mydns.pid`

ironmarc · 2011-10-21 14:29:24 20
Empty Bind9 cache

Occasionally, to force zone updating, cache flush is necessary. The use of this command is better than restart the Bind9 process.
This is sample output - yours may be different.
2

rndc flush

ironmarc · 2011-10-21 14:27:05 5
SVN script for automatically adding and deleting files
This is sample output - yours may be different.
1

svn status | grep '^?' | sed -e 's/^? */svn add "/g' -e 's/$/"/g'|sh ; svn status | grep '^!' | sed -e 's/^! */svn delete "/g' -e 's/$/"/g'|sh

ironmarc · 2010-11-18 09:57:45 4
Sniff ONLY POP3 authentication by intercepting the USER command

The command is useful for monitoring the use of the boxes and their connection IP. Result file "sniff" is readable with GUI program "wireshark" or through CLI with the command: tcpdump -f "sniff" -XX Show Sample Output
This is sample output - yours may be different.
```
USER username@maildomain.com
```
0

tcpdump -i eth0 "tcp port pop3 and ip[40] = 85 and ip[41] = 83" -s 1500 -n -w "sniff"

ironmarc · 2010-11-18 09:03:08 3
Remove unused libs/packages in debian-based distros
This is sample output - yours may be different.
-3

apt-get remove `deborphan`

ironmarc · 2010-11-15 15:15:39 4

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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"

save date and time for each command in history

Date-time format: YYYY-MM-DD HH:MM:SS

Converting video file (.flv, .avi etc.) to .3gp

ffmpeg -i = input file name -s = set frame size, qcif=176x144 -vcodec = force video codec -r = frame-rate [default = 25] -b = bit-rate [200 kb/s] -acodec = force audio codec -ab = audio bitrate in bits/s [64k] -ac = no. of audio channels [1] -ar = audio sampling frequency [44100 Hz] optional: -sameq = use same video quality as source (implies VBR) -f = force format -y = overwrite output files

Most used command

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

Emptying a text file in one shot

% = buffer d = delete

Get the full path to a file

Useful in scripts when the file is passed in as an argument. Eg. $ filepath=$(realpath $1)

Quickly move the cursor to different parts of the command line based on a mark.

Use 'ctrl-@' to set a mark. See the first comment for a better explanation.

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"

Generate a random password 30 characters long

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