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rsync over ssh
This is sample output - yours may be different.
0

rsync -avz -e ssh username@hostname:/path/to/remote/dir/ /path/to/local/dir/

int9h · 2009-02-18 22:02:38 5
Creating sequence of number with text

Nice command to create a list, you can create too with for command, but this is so faster. Show Sample Output
This is sample output - yours may be different.
```
jeju:[xxxx] > seq 10 |xargs -n1 echo Printing line
Printing line 1
Printing line 2
Printing line 3
Printing line 4
Printing line 5
Printing line 6
Printing line 7
Printing line 8
Printing line 9
Printing line 10
jeju:[xxxx] >
```
0

seq 10 |xargs -n1 echo Printing line

Waldirio · 2009-10-15 11:05:35 7
Start the x11vnc server

This will start the x11vnc server, scale it at 6/7, will use the vncpass file to authenticate and wont shut down as soon as a client disconnects
This is sample output - yours may be different.
0

x11vnc -display :0 -scale 6/7 -rfbauth vncpass -forever

JulijanAndjelic · 2009-11-12 21:32:45 3
Send a local file via email

on this way we can define the body too
This is sample output - yours may be different.
0

{ echo -e "$body"; uuencode "$outfile" "$outfile"; } | mail -s "$subject" "$destaddr" ;

glaudiston · 2009-12-10 18:08:59 4
Create a series of incrementing numbers in vim

given lines of the form 123|XXXX|1000 ... 123|XXXX|1011 each 'XXXX' will be replaced with a serial number between 0001 and 0004. Show Sample Output
This is sample output - yours may be different.
```
123|XXXX|1000
123|XXXX|1001
123|XXXX|1010
123|XXXX|1011
---
123|0001|1000
123|0002|1001
123|0003|1010
123|0004|1011
```
0

:.,$!perl -pne 'for $i ("0001".."0004"){ s/XXXX/$i/ if($i == $.) }'

bartonski · 2010-02-11 03:56:26 8
Query well known ports list

Just use your system preinstalled file Show Sample Output
This is sample output - yours may be different.
```
[root#server][~]> portnum 25
smtp            25/tcp          mail
smtp            25/udp          mail
```
0

portnum() { egrep "[[:space:]]$*/" /etc/services; }

unixmonkey26187 · 2011-10-07 16:38:29 3
change file permissions whithout changing directory permissions recursive
This is sample output - yours may be different.
0

sudo find foldername -type f -exec chmod 644 {} ";"

megger · 2012-03-20 21:25:10 3
Displays all available firmware you can get (non-free) in a Debian system
This is sample output - yours may be different.
0

apt-file --package-only search /lib/firmware

gnugr · 2012-09-04 15:14:46 6
Useless fun

Something I pulled off 4chan, it plays a tune.
This is sample output - yours may be different.
0

echo "main(i){for(i=0;;i++)putchar(((i*(i>>8|i>>9)&46&i >>8))^(i&i>>13|i>>6));}" | gcc -x c - && ./a.out | aplay

r0nd0n · 2013-01-09 21:48:23 6
get gzipped logs from webserver to local machine
This is sample output - yours may be different.
0

ssh user@remote "tar cfp - /path/to/log/* | gzip" > local.tar.gz

vaaclav · 2013-04-30 09:18:18 6
Poor man's

I sometimes have use an usb stick to distribute files to several standalone "internet" pc's. I don't trust these machines period. The sticks I have do not have a write protection. So as a added security measure I fill the unused space on the (small) usb stick with a file with randomly generated bits. Any malware that tries to write to this stick will find no space on it. Tested on slackware 14 Note: you may need root access to write to the device. This depends on your mount options. Show Sample Output
This is sample output - yours may be different.
```
set +e +u; dd if=/dev/urandom of="/media/usb1/$$";sync;sync
dd: writing to ?/mnt/hd/2967?: No space left on device
32617+0 records in
32616+0 records out
16699392 bytes (17 MB) copied, 1.436 s, 11.6 MB/s
```
0

set +e +u; dd if=/dev/urandom of="/media/usb1/$$";sync;sync

warkruid · 2013-12-22 14:35:53 21
Serve current directory tree at http://$HOSTNAME:8000/
This is sample output - yours may be different.
0

ruby -run -e httpd . -p 8000

koter · 2014-03-19 16:34:06 8
Grab all JIRA ticket numbers (e.g. ABC-123) mentioned in commits added in feature branch off of master

To get the list of tickets in a comma-separated list, pipe the above into: sort | uniq | perl -pe 's/\n/, /' | sed 's/, $//' Show Sample Output
This is sample output - yours may be different.
```
ABC-123
ABC-124
ABC-145
```
0

git log master...feature-a | grep -o -E '\b([A-Z]+)-[0-9]+\b' | sort | uniq

westonruter · 2014-07-07 18:51:01 6
optimize all png images
This is sample output - yours may be different.
0

find . -name *.png | xargs optipng -nc -nb -o7 -full

homoludens · 2014-10-29 10:17:31 9
Get non-localhost IPs from all Internet interfaces
This is sample output - yours may be different.
0

ifconfig -a | grep inet | awk '{print $2}' | cut -d ":" -f 2 | grep -v 127.0.0.1

Dairenn · 2015-02-09 19:19:20 8
Create a new File without I/O

Create a new file, without checking the existence, without I/O; environment test: Linux Bash
This is sample output - yours may be different.
0

>> "file_name";

Izhaq_Melo · 2015-06-03 03:03:57 9
Unzip all zip files in a directory into a newly created directory based on zip file name

For some reason some people do not place files into folders before archiving. This fixes the mess by creating new directories per zip file in directory to unzip to. Show Sample Output
This is sample output - yours may be different.
```
Archive: ABC.zip
extracting: ABC/1
extracting: ABC/2
Archive: DEF.zip
extracting: DEF/1
extracting: DEF/2
```
0

for f in *.zip; do unzip -d "${f%*.zip}" "$f"; done

osu · 2017-07-26 22:26:22 16
Visual system load display

It takes the first value of /prov/loadavg to print that many stars followed by the value. Show Sample Output
This is sample output - yours may be different.
```
******************** 20.98
********************* 21.30
******************* 19.92
**************** 16.85
*************** 15.50
************** 14.90
```
0

while [ true ]; do cat /proc/loadavg | perl -ne 'm/(^[^ ]+)/; $L = $1; print "*" x $L; print " $L\n";' ; sleep 6; done

t3o · 2017-10-13 06:47:06 22
search into contents of python module

srchpymod for e.g. srchpymod cairo Surface ['ImageSurface', 'PDFSurface', 'PSSurface', 'SVGSurface', 'Surface', 'SurfacePattern', 'XlibSurface'] Show Sample Output
This is sample output - yours may be different.
```
Matched symbols in the python module.
```
0

srchpymod() { python -c "import $1; print filter(lambda x: x.find('$2') >= 0, dir($1))"; };

jyro · 2009-02-16 02:47:13 60
Eclipse needs to know the path to the local maven repository. Therefore the classpath variable M2_REPO has to be set.

Taken from - http://maven.apache.org/guides/mini/guide-ide-eclipse.html
This is sample output - yours may be different.
0

mvn -Declipse.workspace=<path-to-eclipse-workspace> eclipse:add-maven-repo

savaged · 2009-05-22 10:12:29 3

Geo Weather

This command will determine an individuals local weather, based on their I.P. address. I had to learn a lot about SED and a little about XMLStarlet in order to achieve this. This command is my original work and there is much room for improvement; I look forward to any constructive feedback. Show Sample Output

xmlstarlet fo "http://www.google.com/ig/api?weather=$(curl -s api.hostip.info/get_html.php?ip=$(curl -s icanhazip.com)... SEE SAMPLE OUTPUT

o0110o · 2010-02-11 06:32:44 5

display the ttl of a hostname in a human readable form

This function uses timetrans from the dnssec-tools to calculate the remaining time until a dns entry reaches its time to live and is fetched from the authoritive nameserver again. Show Sample Output
This is sample output - yours may be different.
```
$ ttl www.commandlinefu.com
17 minutes, 7 seconds
```
0

function ttl { /usr/sbin/timetrans -count $(dig +noquestion +noadditional +noauthority $1 | grep "^$1" | awk '{print $2}') }

cz8s · 2010-11-22 17:46:03 4
Dump /dev/ttyS0 on background automatically from startup

Put this command on /etc/rc.local.
This is sample output - yours may be different.
0

nohup cat /dev/ttyS0 | tee -a llamadas.db&

fjrojast · 2011-05-05 15:47:27 3
Displays all installed firmware in your Debian sytem
This is sample output - yours may be different.
0

aptitude search ~i ~nfirmware

gnugr · 2012-09-04 15:21:47 4
Convert video file to sequence of images

-i sets the source file -r sets the output frame rate, set it to the same frame rate as the input to output each frame -f sets the output format, trough it might be guessed by the extension
This is sample output - yours may be different.
0

ffmpeg -i source.mpg -r 24 -f image2 still-%6d.png

manuq · 2013-01-10 02:49:15 4
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Pretty man pages under X

You're a developer - but it doesn't mean you have to slum it! Why not spice up your man page lookups by using a decent PDF viewer. I use 'xpdf' - maybe you prefer acroread, whatever, it's just as fast as plain dull ASCII on today's machines and you can still search for stuff - that's the main reason I use PDF and not PS.

Make vim open in tabs by default (save to .profile)

I always add this to my .profile rc so I can do things like: "vim *.c" and the files are opened in tabs.

Get a free shell account on a community server

Bash process substitution which curls the website 'hashbang.sh' and executes the shell script embedded in the page. This is obviously not the most secure way to run something like this, and we will scold you if you try. The smarter way would be: Download locally over SSL > curl https://hashbang.sh >> hashbang.sh Verify integrty with GPG (If available) > gpg --recv-keys 0xD2C4C74D8FAA96F5 > gpg --verify hashbang.sh Inspect source code > less hashbang.sh Run > chmod +x hashbang.sh > ./hashbang.sh

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"

Unzip 25 zip files files at once

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

resume download using curl

Compare two directories

Output of this command is the difference of recursive file lists in two directories (very quick!). To view differences in content of files too, use the command submitted by mariusbutuc (very slow!): $ diff -rq path_to_dir1 path_to_dir2

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"

Copy ssh keys to user@host to enable password-less ssh logins.

To generate the keys use the command ssh-keygen

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