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Get your external IP address

Fast and simple. Details: http://api.ident.me Show Sample Output
This is sample output - yours may be different.
```
123.123.123.123
```
0

curl http://ident.me

gmy · 2015-01-13 14:34:47 9
talking clock

s/espeak/say/ on a mac
This is sample output - yours may be different.
0

echo $(date +%m) past $(date +%H) | espeak

hal8 · 2015-05-09 12:24:13 10
Open the current directory in the OS X Finder.
This is sample output - yours may be different.
0

open .

ratberryjam · 2015-11-01 15:00:49 10
add a little color to your prompt
This is sample output - yours may be different.
0

PS1="\[\033[44;1;37m\]\u\[\033[0m\]@\h\\$ "

elofland · 2009-02-05 17:29:18 25
Strip out Hungarian notation from a PHP file

This removes the type prefix used in Hungarian notation (v. bad) for PHP variables. Eg. variables of the form $intDays, $fltPrice, $arrItems, $objLogger convert to $days, $price, $Items, $logger.
This is sample output - yours may be different.
0

cat file.php | perl -p -e 's/(\$|->)(str|arr|obj|int|flt|boo|bool|mix|res)([A-Z])/$1\L$3/g'

root · 2009-02-10 14:37:12 11
Use the page up key to complete the command.

What this does is, if I type ?ssh ? then hit the page-up key, it will complete the line to the last time in my history file that I typed ssh. Hitting page up again will go to the 2nd to last time I typed it. Incredibly handy if you ever type the same commands more than once. credit goes to http://www.sharms.org/blog/2009/03/10/make-your-bash-shell-cool-again/ echo "\"\e[6~\": history-search-forward" >> ~/.inputrc
This is sample output - yours may be different.
0

echo "\"\e[5~\": history-search-backward" >> ~/.inputrc

silbermm · 2009-03-10 15:32:52 11
Show the ordered header line (with field names) of a CSV file

This little command (function) shows the CSV header fields (which are field names separated by commas) as an ordered list, clearly showing the fields and their order. Show Sample Output
This is sample output - yours may be different.
```
% headers table.csv 
    1	Date
    2	Open
    3	High
    4	Low
    5	Close
    6	Volume
    7	Adj Close
```
0

function headers { head -1 $* | tr ',' '\12' | pr -t -n ; }

totoro · 2009-03-25 20:07:47 14
Move all files untracked by git into a directory
This is sample output - yours may be different.
0

git clean -n | sed 's/Would remove //; /Would not remove/d;' | xargs mv -t stuff/

drmaciver · 2009-12-07 13:13:14 6
Open the last modified file of a certain type

Change open-command and type to suit your needs. One example would be to open the last .jpg file with Eye Of Gnome: eog $(ls -rt *.jpg | tail -n 1)
This is sample output - yours may be different.
0

open-command $(ls -rt *.type | tail -n 1)

RBerenguel · 2010-04-04 20:43:38 4
Find, Replace, Write & Remove First 5 Lines

I wrote this script to speed up Nginx configs. This (long) one liner can be run via BASH. You will see that we set a variable in bash called 'foo' and the streamline editor (sed) finds 'bar' in 'foo.conf' next it writes that output to a temp file (foo.temp) and removes the first 5 lines (that aren't needed in this case) & lastly it moves (overwrites) foo.temp to foo.conf Show Sample Output
This is sample output - yours may be different.
```
server {
  listen 80;
  server_name www.foo.com;
  access_log /var/log/nginx/access.log main;
  error_log /var/log/nginx/error.log warn;

}
```
0

variable="foo" && sed 's/bar/'$variable'/g' $variable.conf >> $variable.temp && sed '1,5d' $variable.temp && mv $variable.temp $variable.conf

jdorfman · 2010-07-09 22:12:51 8
Show package reverse dependencies with apt

Show Sample Output
This is sample output - yours may be different.
```
$ apt-cache rdepends tar
tar
Reverse Depends:
  file-roller
  vfu
  newlib-source
 |dvbackup
  dump
  amanda-common
  file-roller
  backuppc
```
0

apt-cache rdepends <packagename>

piccobello · 2011-07-18 15:17:02 3
Generate an XKCD #936 style 4 word password

Before running, do: curl -sO http://world.std.com/%7Ereinhold/diceware.wordlist.asc Show Sample Output
This is sample output - yours may be different.
```
snapcodonmarshstink
```
0

perl -F'\s+' -anE 'push @w,$F[1];END{$r.=splice @w,rand @w,1 for(1..4);say $r}' diceware.wordlist.asc

zedlopez · 2011-08-24 18:50:16 3
Command to generate an integer from the hostname, valid within the Days of Month

Requirements: Output: integer x , 1>=x Input: hostname Able to reproduce on the same host Acceptable for output to be different among OSes (Solaris, Linux, BSD) Useful for providing DayOfMonth splay in cron jobs. Capped at 28 for Febtober. Show Sample Output
This is sample output - yours may be different.
```
23
```
0

$(($(hostname|sum|cut -f1 -d" ")%27+1))

LightningCrash · 2011-12-13 19:27:03 3
Find your Amazon EC2 instance type

Only works from within Amazon EC2. Show Sample Output
This is sample output - yours may be different.
```
m1.small
```
0

curl -s http://169.254.169.254/latest/meta-data/instance-type

tonibirrer · 2012-01-29 19:21:47 3
What is my public IP address

curl is much faster then the GET, and has less dependencies.
This is sample output - yours may be different.
0

curl -s checkip.dyndns.org|grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}'

sosperec · 2012-03-08 07:43:15 3
Generate random password, human readable with no special characters.
This is sample output - yours may be different.
0

false; while [ $? != 0 ]; do apg -c /dev/urandom -n1 -E oOlL10 | egrep '^[[:alnum:]]+$'; done

evolix · 2012-04-24 08:30:28 4
Suspend ssh session

Suspend ssh session Show Sample Output
This is sample output - yours may be different.
```
ankush@khush:~$ ~^Z [suspend ssh]

[1]+  Stopped                 ssh remotehost
```
0

~ <Ctrl+Z>

ankush108 · 2012-06-26 16:23:28 7
comment / uncomment a line in a file using sed.

Show Sample Output
This is sample output - yours may be different.
```
comment:
$ sed -i 's/blah.*/#&/g' file.txt 
$ cat file.txt 
dugh
#blah
adfas
sdfkb
#blah
asdfkk
#blah

uncomment:
$ sed -i 's/.$blah*.$/\1/g' file.txt
$cat file.txt 
dugh
blah
adfas
sdfkb
blah
asdfkk
blah
```
0

(comment:) $ sed -i 's/blah.*/#&/g' file.txt (uncomment:) $ sed -i 's/.$blah*.$/\1/g' file.txt

omatictost · 2012-10-25 16:00:29 221
like rm, but keep backups of files and dirs in ~/.rm
This is sample output - yours may be different.
0

alias rn='mkdir -p ~/.rm`pwd`; mv -v -f --backup=t -t ~/.rm`pwd` "$@"'

koppi · 2013-04-17 10:56:21 4
Quickly write and run a C program.
This is sample output - yours may be different.
0

vim test.c && gcc -x c -o a.out test.c && ./a.out && rm a.out test.c

ari2015 · 2013-09-08 15:09:09 6
Find default gateway
This is sample output - yours may be different.
0

ip route list 0/0

thrix · 2014-06-09 16:07:38 7
Global BTC rate in EUR

Returns the global weighted BTC rate in EUR. Requires the "jq" JSON parser. Show Sample Output
This is sample output - yours may be different.
```
BTC rate is 213.53 ?
```
0

echo "BTC rate is" $(wget https://api.bitcoinaverage.com/ticker/global/EUR/ -q -O - | jq ".last") "?"

lordtoran · 2015-09-28 23:03:59 13
Search irssi logs for specific pattern and display time and matching lines
This is sample output - yours may be different.
0

find ~/irclogs/ -type f -printf "%T+\t%p\n" | sort | cut -f2 | xargs -I {} sed -n "/^\-\-\-/ {x; /searched phrase/ p;x;h}; /searched phrase/ {H;};" {}

jnxy · 2015-11-03 14:00:50 10
Show public IPv4 and IPv6
This is sample output - yours may be different.
0

echo "IPv4: $(curl -s4 ip.appspot.com)" ; echo "IPv6: $(curl -s6 ip.appspot.com)"

pqatsi · 2017-12-26 12:52:38 19
Convert an ssh2 public key to openssh format
This is sample output - yours may be different.
0

ssh-keygen -i -f $sshkeysfile >> authorized_keys

wwest4 · 2009-02-05 17:32:02 30
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Create a directory and cd into it

This creates a bash function `take` that you can call with the name of the directory as the first parameter. Add the function to ~/.bashrc to have it available anytime.

Create a self-extracting archive for win32 using 7-zip

using `cat` under *NIX - just because you help manage M$ Windoze *doesn't* mean you should have to resort to using it! You can also make custom win32 installers with the 7zip "extras" package: $ cat /path/to/7zSD.sfx /path/to/config.txt /path/to/archive > setup.exe

Show line numbers in a text file

exclude file(s) from rsync

rsyncs files to a server excluding listed files also a file can be used to exclude common exclude rules and/or to exclude a ton of files, like so: $rsync --exclude-from '~/.scripts/exclude.txt' where exclude.txt has one rule per line: *.mp3 *.svn*

Select rectangular screen area

Hold 'Ctrl' + 'Alt' key while selecting rectangular text area of the screen with left mouse button. Should work in any terminal screen (xterm, konsole, ...) under X, if not then try with 'Ctrl' + 'Shift' + 'Alt' or two-combination of these.

pdfcount: get number of pages in a PDF file

Convert a bunch of HTML files from ISO-8859-1 to UTF-8 file encoding in a folder and all sub-folders

This is my first attempt at converting all HTML files to UTF-8 file encoding, including all subfolders. Theres probably a much more compact way to do it, but I'm quite proud of it with my windows background ;)

Run a command after the process you choose finishes

Run a command as soon as another long-running command finishes. E.g. suspend the machine after performing apt upgrade. The process is selected interactively via fzf.

run a VirtualBox virtual machine without a gui

you can launch a VirtualBox VM from the command line using VBoxManage, but that invokes it in a gui environment. If you want to just fire off your VM in the background, use VBoxHeadless as shown. To get the names and UUIDs of your VirtualBox VMs, type: $ VBoxManage list

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"

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