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Show external IP; Short and sweet.

lynx -dump ip.nu Your IP address is 0.0.0.0
This is sample output - yours may be different.
0

lynx -dump ip.nu

ariver · 2012-05-02 14:54:12 3
change default Web browser

also use: update-alternatives --config gnome-www-browser
This is sample output - yours may be different.
0

update-alternatives --config x-www-browser

gwd · 2012-07-08 20:27:42 4
Preview All Files in Directory
This is sample output - yours may be different.
0

find . -type f | xargs -I% bash -c 'echo -e "\033[31m%\033[0m" && [[ ! `file %` =~ .*binary.* ]] && head "%"'

mx4492 · 2012-08-28 12:52:38 9
Total size in RPM packages

It is not the installed size in files, but the size of RPM packages. Show Sample Output
This is sample output - yours may be different.
```
Total size in packages = 14.5 GB
```
0

rpm -qa --queryformat '%{SIZE}\n' | awk '{sum += $1} END {printf("Total size in packages = %4.1f GB\n", sum/1024**3)}'

skytux · 2013-12-14 20:22:41 10
List EC2 servers by tag name and instanceId

Uses the python-based AWS CLI (https://aws.amazon.com/cli/) and the JSON query tool, JQ (https://stedolan.github.io/jq/)
This is sample output - yours may be different.
0

aws ec2 describe-instances --query "Reservations[*].Instances[*]" | jq '.[]|.[]|(if .Tags then (.Tags[]|select(.Key == "Name").Value) else empty end)+", " +.InstanceId'

thatinstant · 2014-06-26 20:01:12 7
easiest way to get kernel version without uname

The dmesg will show the kernel it is booting. No more dependency on files Show Sample Output
This is sample output - yours may be different.
```
# dmesg                                  
Booting Linux on physical CPU 0
Initializing cgroup subsys cpu
Linux version 3.4.67-01422-gd3ffcc7-dirty (digit@tyrion.par.corp.google.com) (gcc version 4.8 (GCC) ) #1 PREEMPT Tue Sep 16 19:34:06 CEST 2014
```
0

dmesg

sagarsakre · 2014-10-22 10:03:56 8
What's the weather like?

Just 253 chars of pure UNIX magic, with curl. I created this contrived bash one-liner while building a command-line bash game : www.rubegoldbash.com. Show Sample Output
This is sample output - yours may be different.
```
   Endeavour Inlet

   title
   19.128?
   Clouds: 88%
   Humidity: 98%
   Wind: 13.12 m/s
   Pressure: 1013.76hpa
```
0

curl -s ip.appspot.com | xargs -n 1 curl -s "freegeoip.net/csv/$1" | cut -d ',' -f '9 10' | sed 's/,/\&lon=/g' | xargs -n 1 echo "http://api.openweathermap.org/data/2.5/weather?mode=html&lat=$1" | sed 's/ //g' | xargs -n 1 curl -s $1 | lynx -stdin -dump

supermoustachu · 2015-02-04 00:47:06 14
Convert video file to animated gif (high quality)

Requires ffmpeg with image2pipe filter and imagemagick Show Sample Output
This is sample output - yours may be different.
```
<gif output>
```
0

ffmpeg -i input.mp4 -vf scale=w=320:h=-1 -r 10 -f image2pipe -vcodec ppm - | convert -delay 5 -loop 0 - output.gif

TheMadScientist · 2016-01-08 17:21:37 11
To help sort through differences in .txt files
This is sample output - yours may be different.
0

diff *txt -u | less

creepyjones · 2016-07-20 17:53:04 12
Salvage a borked terminal
This is sample output - yours may be different.
0

tput rmso

hansgruber · 2017-07-13 20:01:42 17
XZIP many catalogs

Find (by regular expression) and compress (xzip) catalogs then remove source catalogs
This is sample output - yours may be different.
0

find . -type d |awk '$1 ~ /[0-9]/ {print $0}' |xargs -P 4 -I NAME tar --remove-files -vcJf NAME.tar.xz NAME

Glafir · 2017-08-28 08:05:29 19
package most recent files in project

create tar.bz2 package from files "-type f" modificated today "-mtime -1" in ~/project
This is sample output - yours may be different.
0

find ~/project -mtime -1 -type f -print | tar jcvf myfiles.tar.bz2 -T -

voyeg3r · 2009-03-13 13:03:11 4
Disable graphical login on OpenSolaris

On Solaris 10 you used dtconfig -d to achieve this. The command will disable X and your system will now boot to a text console.
This is sample output - yours may be different.
0

svcadm disable gdm

thesuperjason · 2009-07-25 02:32:46 3
Convert a .wav file to .sln file
This is sample output - yours may be different.
0

sox is_that_correct.wav -t raw -r 8000 -s -w -c 1 is_that_correct.sln

tkembo · 2011-08-31 13:03:30 4
Colored word-by-word diff of two files

Requires wdiff. Prints the word-by-word diff with the old version highlighted in red, and the new in green. Change the colors by altering 41m and 42m. 45m is more of a magenta and may be easier to read.
This is sample output - yours may be different.
0

wdiff -n -w $'\033[30;41m' -x $'\033[0m' -y $'\033[30;42m' -z $'\033[0m' oldversion.txt newversion.txt

abracadabra · 2011-11-10 18:35:41 3
Symlink most recent file to 'latest' using full paths.
This is sample output - yours may be different.
0

ln -s "`find /path -type f -iname $(ls -t /path | head -1 )`" /path/latest

logikal · 2011-12-21 07:20:17 3
Print trending topics on Twitter

Prints top 5 twitter topics. Not very well written at all but none of the others worked.
This is sample output - yours may be different.
0

curl -s mobile.twitter.com/search | sed -n '/trend_footer_list/,/\ul>/p' | awk -F\> '{print $3}' | awk -F\< '{print $1}' | sed '/^$/d'

articmonkey · 2012-03-15 17:17:06 3
Geographic location and more for current external IP address.
This is sample output - yours may be different.
0

lynx -dump http://www.ip2location.com/ | sed -n '/^ *Field Name *Value *$/,/^ *\[_\] *Mobile .*Carrier.*name/p'

ariver · 2012-05-02 15:46:59 5
find css or js files, minifiy with in-path-yuicompressor, gzip output, and save into <static-file>.gz
This is sample output - yours may be different.
0

find -regextype posix-egrep -regex '.*\.(css|js)$' | xargs -I{} sh -c "echo '{}' && yuicompressor '{}' | gzip -c > '{}.gz'"

frankowp · 2013-12-14 20:27:47 8
Search recursively to find a word or phrase in certain file types, such as C code

Warnings and errors will be suppressed Show Sample Output
This is sample output - yours may be different.
```
./web/blah.html:33:		<div>some string and some such</div>
```
0

grep --include=\*.html -R "some string" . 2>/dev/null

sjmixon · 2015-02-04 17:59:41 8
grant me all the groups

NSFW - use this on personal laptops where you want your personal user to have all the groups Show Sample Output
This is sample output - yours may be different.
```
Adding user user1 to group lpadmin
.....all the groups
```
0

cut -f1 -d: /etc/group|xargs -n1 -I{} gpasswd -a $USERNAME {}

thoth · 2016-01-08 18:03:36 12
debian keyboard layout reconfigure

select generic 105 intl. pc > german (turkisch)
This is sample output - yours may be different.
0

dpkg-reconfigure keyboard-configuration

aysadk · 2017-07-14 15:04:02 100
rsnapshot vim edit replaying space tabs
This is sample output - yours may be different.
0

sed 's/ \+ /\t/g' /usr/local/etc/rsnapshot.conf >/tmp/snap.conf

aysadk · 2017-08-28 13:18:12 18
Disable all iptables rules without disconnecting yourself

This turns your iptables packet filter to a "Allow any from any to any" filter, so you can rule out any filtering issues when you have a problem to enable a connection from or to your host. To re-enable it, run /etc/init.d/iptables restart
This is sample output - yours may be different.
0

iptables -F && iptables -X && iptables -P INPUT ACCEPT && iptables -OUTPUT ACCEPT

lme · 2009-03-27 15:03:54 5
Get a summary of network devices in the system

Basically an improvement on an earlier ethtool command line. Show Sample Output
This is sample output - yours may be different.
```
# eth0
	Speed: Unknown! (65535)
	Link detected: no
# eth1
	Speed: 100Mb/s
	Link detected: yes
# lo
	Link detected: yes
# pan0
	Link detected: yes
# tap1
	Speed: 10Mb/s
	Link detected: no
```
0

for i in /sys/class/net/*; do e=`basename $i`; echo "# $e"; sudo ethtool $e | grep -E "Link|Speed" ; done

hank · 2009-04-25 14:32:08 10
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Print diagram of user/groups

Parses /etc/group to "dot" format and pases it to "display" (imagemagick) to show a usefull diagram of users and groups (don't show empty groups).

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 :)

convert UNIX timestamp to UTC timestamp

date -ud @1320198157

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"

Create a quick back-up copy of a file

Uses shell expansion to create a back-up called file.txt.bak

Ctrl+S Ctrl+Q terminal output lock and unlock

These are simple shortcuts to pause and continue terminal output, works in most terminals and screen multiplexers like screen. You can use it to catch something if things change too fast, and scroll with Shift + PgUp PgDown. On linux console ScrollLock can also be used.

Copy files from multiple directories into one directory

Dump dvd from a different machine onto this one.

You can use this to directly dump from machine A (with dvd drive) to machine B (without dvd drive) . I used this to copy dvd using my friend's machine to my netbook. Above command is to be issued on machine B. Advantages : 1) No wasting time dumping first to machine A and then copying to Machine B. 2) You dont need to use space on Machine A. In fact, this will work even when Machine A doesnt have enough hdd space to dump the DVD. Use -C ssh option on slow networks (enables compression). you can replace "dd if=/dev/dvd" with any ripping command as long as it spews the iso to stdout.

recursive search and replace old with new string, inside files

Search and replace recursively. :-) Shorter and simpler than the others. And allows more terms: replace old new [old new ...] -- `find -type f`

Create an SSH connection (reverse tunnel) through your firewall.

Allows you to establish a tunnel (encapsulate packets) to your (Server B) remote server IP from your local host (Server A). On Server B you can then connect to port 2001 which will forward all packets (encapsulated) to port 22 on Server A. -- www.fir3net.com --

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