Commands by sucotronic

Commands by sucotronic (10)

sorted by

Capture video Macbook webcam with cpu accelerated

Captures video from webcam and encodes it using the accelerated hardware provided by videotoolbox framework. It takes about 20% cpu in a i5 2015 macbook air. Show Sample Output

ffmpeg -f avfoundation -framerate 30 -video_size 1280x720 -pix_fmt uyvy422 -i "0" -c:v h264_videotoolbox -profile:v high -b:v 3M -color_range 1 /tmp/out.mp4

sucotronic · 2018-01-08 10:28:42 22

Create test images

Useful to test programs and webpages. Show Sample Output
This is sample output - yours may be different.
```
1.jpg
2.jpg
...
100.jpg
```
3

for i in {1..100}; do convert -background lightblue -fill blue -size 100x100 -pointsize 24 -gravity center label:$i $i.jpg; done

sucotronic · 2014-07-25 09:32:23 46
Search files with js declarations inside

Useful to crawl where the javascript is declared, and extract it a common file. You can redirect it to a file to review item by item. Show Sample Output
This is sample output - yours may be different.
```
path1/one.php
two.php
path2/path3/five.php
```
2

grep -r "<script" | grep -v src | awk -F: '{print $1}' | uniq

sucotronic · 2014-07-23 06:24:31 12
Rename with regular expression and leading zeros

Given a bunch of files with "wrong" date naming, it renames them in a "good" format. Show Sample Output
This is sample output - yours may be different.
```
result_26_2_2014.json.txt renamed as 20140226.txt
result_26_3_2014.json.txt renamed as 20140326.txt
result_26_4_2014.json.txt renamed as 20140426.txt
result_26_5_2014.json.txt renamed as 20140526.txt
result_26_7_2013.json.txt renamed as 20130726.txt
result_26_8_2013.json.txt renamed as 20130826.txt
result_26_9_2013.json.txt renamed as 20130926.txt
```
0

rename 's/result_([0-9]+)_([0-9]+)_([0-9]+)\.json\.txt/sprintf("%d%02d%02d.txt",$3,$2,$1)/ge' result_*.txt

sucotronic · 2014-06-13 07:34:32 6
mean color of an image

You can get the mean value for the colours in an image. Then you can determine, in general, how dark or bright is the image and run some other actions based on that. I'll recommend to readjust the brightness of the images using +sigmoidal-contrast option of imagemagick convert command. Show Sample Output
This is sample output - yours may be different.
```
105
```
1

convert image.jpg -resize 1x1 txt: | tail -1 | awk '{gsub(/[,\)]/," "); print $3+$4+$5}'

sucotronic · 2013-12-11 09:13:00 11
open remote desktop connection without X

You can use it to connect to remote windows machine and start some scritps that need user login
This is sample output - yours may be different.
1

xvfb-run --server-num=1 rdesktop -u name -p pass -g 1024x768 192.168.0.1

sucotronic · 2013-09-19 08:53:00 8
send raw data (hex written)using UDP to an IP and port

Use it to send raw data to a networked device. Used to interact with relay controller board whose documentation is lost, so use wireshark to sniff the sent data and replayed using the command.
This is sample output - yours may be different.
1

echo -n 023135 | perl -pe 's/([0-9a-f]{2})/chr hex $1/gie' | nc -4u -q1 -p5001 192.168.0.100 2000

sucotronic · 2013-09-18 14:31:47 8
Random Number Between 1 And 256

It takes a byte from /dev/random whose source is the kernel entropy pool (better source than other solutions). Show Sample Output
This is sample output - yours may be different.
```
 189
```
6

od -An -N1 -tu1 /dev/random

sucotronic · 2013-09-10 08:57:16 124
purge half of files in backup directory

If you have a directory with lot of backups (full backups I mean), when it gets to some size, you could want to empty some space. With this command you'll remove half of the files. The command assumes that your backup files starts with YYYYMMDD or that they go some alphabetical order. Show Sample Output
This is sample output - yours may be different.
```
(nothing, it will remove half of the files)
```
-1

find . | sort | awk 'NR%2==0' | xargs rm $1

sucotronic · 2013-07-11 07:36:18 11
Count the number of pages of all PDFs in current directory and all subdirs, recursively
This is sample output - yours may be different.
2

find . -name "*.pdf" -exec pdftk {} dump_data output \; | grep NumberOfPages | awk '{s+=$2} END {print s}'

sucotronic · 2013-01-09 15:26:45 44

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

run remote linux desktop

First of all you need to run this command. X :12.0 vt12 2>&1 >/dev/null & This command will open a X session on 12th console. And it will show you blank screen. Now press Alt + Ctrl + F7. You will get your original screen. Now run given command "xterm -display :12.0 -e ssh -X user@remotesystem &". After this press Alt + Ctrl + F12. You will get a screen which will ask you for password for remote linux system. And after it you are done. You can open any window based application of remote system on your desktop. Press Alt + Ctrl + F7 for getting original screen.

Find usb device in realtime

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

String to binary

Cool but useless.

Quickly ping range of IP adresses and return only those that are online

Tested in Debian, ymmv. - c 1 : send only one ping;; -W 1: wait for one second and then exit ping, assuming target IP is not available; change as needed (-W 0.5 for half a second, smaller or greater value depending on network speed/latency)

Numbers guessing game

Felt like I need to win the lottery, and wrote this command so I train and develop my guessing abilities.

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"

Find all active ip's in a subnet

nmap for windows and other platforms is available on developer's site: http://nmap.org/download.html nmap is robust tool with many options and has various output modes - is the best (imho) tool out there.. from nmap 5.21 man page: -oN/-oX/-oS/-oG : Output scan in normal, XML, s|

simple backup with rsync

With this cron, rsync begins to sinchronize the contents of the local directory on /[VIPdirectory] with the directory /backup/[VIPdirectory] on the remote server X.X.X.X. Previously we need working on public/private-keys ssh to guarantee the acces to the remote server on X.X.X.X

ps -ef | grep PROCESS | grep -v grep | awk '{print $2}' | xargs kill -9

kills all pids matching the search term of "PROCESS". Be careful what you wish for :)

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands by sucotronic