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Extract all urls from the last firefox sessionstore.js file used.
This is sample output - yours may be different.
-1

sed -e 's/{"url":/\n&/g' ~/.mozilla/firefox/*/sessionstore.js | cut -d\" -f4

cfajohnson · 2009-12-10 04:31:31 4
Change the homepage of Chromium
This is sample output - yours may be different.
-1

change-homepage(){ sed -ri 's|( "homepage": ").*(",)|\1'"$@"'\2|' .config/chromium/Default/Preferences; }

matthewbauer · 2010-04-10 21:21:55 3
Add EC2 pem key to SSH

This command adds your pem key to SSH so that you no longer have to manually specify it when connecting to EC2 instances. # you can do this: ssh ec2-instance.amazonaws.com # instead of this: ssh -i ~/.ssh/KEY_PAIR_NAME.pem ec2-instance.amazonaws.com Show Sample Output
This is sample output - yours may be different.
```
Identity added: /Users/johndoe/.ssh/KEY_PAIR_NAME.pem (/Users/johndoe/.ssh/KEY_PAIR_NAME.pem)
```
-1

ssh-add ~/.ssh/KEY_PAIR_NAME.pem

brockangelo · 2012-11-03 02:59:52 5
Creating rapidly an html menu

This will create rapidly an html menu. You can paste it in you're html page with the middle button(the wheel). I didn't test it in an html with css, but it seems alright. Show Sample Output
This is sample output - yours may be different.
```
<ul>
 <li>menu 1</li>
  <ul>
   <li>item 1</li>
   <li>item 2</li>
   <li>item 3</li>
   <li>item 4</li>
   <li>item 5</li>
  </ul>
</ul>
<ul>
 <li>menu 2</li>
  <ul>
   <li>item 1</li>
   <li>item 2</li>
   <li>item 3</li>
   <li>item 4</li>
   <li>item 5</li>
  </ul>
</ul>
<ul>
 <li>menu 3</li>
  <ul>
   <li>item 1</li>
   <li>item 2</li>
   <li>item 3</li>
   <li>item 4</li>
   <li>item 5</li>
  </ul>
</ul>
<ul>
 <li>menu 4</li>
  <ul>
   <li>item 1</li>
   <li>item 2</li>
   <li>item 3</li>
   <li>item 4</li>
   <li>item 5</li>
  </ul>
</ul>
```
-1

for menu in {1..4}; do echo -e "<ul>\n <li>menu $menu</li>\n <ul>"; for items in {1..5}; do echo " <li>item $items</li>"; if [ $items -eq 5 ];then echo -e " </ul>";fi;done; echo "</ul>";done | xclip

qcjn · 2013-09-22 06:34:32 6
List complete size of directories (do not consider hidden directories)
This is sample output - yours may be different.
-1

du --max-depth=1 | grep -v '\.\/\.'

netkavu · 2010-04-10 22:14:49 3
find names of files ending in *log that have both foo and bar

Uses xargs to call the second grep with the first grep's results as arguments
This is sample output - yours may be different.
-1

grep -l bar *.log | xargs grep -l foo

dlebauer · 2011-01-10 19:54:46 3
Convert DOS newlines (CR/LF) to Unix format

requires the package tofrodos on Debian/Ubuntu: sudo apt-get install tofrodos
This is sample output - yours may be different.
-1

fromdos <file>

jbuitt · 2011-02-14 17:28:53 3
measure answer time of a web service

This uses curl to find out the access times of a web service Show Sample Output
This is sample output - yours may be different.
```
1. 13:54:15: real 0m0.393s
2. 13:54:21: real 0m0.053s
3. 13:54:28: real 0m0.678s
4. 13:54:34: real 0m0.166s
....
40. ...
```
-1

for i in {1..40};do echo -n $i. $(date +%H:%M:%S):\ ; (time curl 'http://ya.ru/' &> /dev/null) 2>&1|grep real;sleep 1;done

AntonyC · 2011-11-11 10:40:38 3
Change all instances of a word in all files in the current directory

This command will replace all instances of 'foo' with 'bar' in all files in the current working directory.
This is sample output - yours may be different.
-1

perl -pi -e 's/foo/bar/g' $(grep -l foo ./*)

dopeman · 2009-03-27 17:18:08 6
Generate a Universally Unique Identifier (UUID)

http://en.wikipedia.org/wiki/Universally_Unique_Identifier http://www.ossp.org/pkg/lib/uuid/ You'll first need to install the uuid package. Available immediately from apt in Ubuntu, Debian, or other myriad Debian variants. You could always compile it from source as well. Show Sample Output
This is sample output - yours may be different.
```
bfcca18a-8857-11de-bdc3-0024e80e2d83
```
-1

uuid

linuxrawkstar · 2009-08-14 14:02:37 7
List complete size of directories (do not consider hidden directories)
This is sample output - yours may be different.
-1

du -sh * | grep -v '\.\/\.'

marcopferreira · 2010-04-10 23:19:46 4
Get Informed by your box that you are awesome ;)

sends notification msg within repeated intervals of time to notify-send ;) Just for fun.
This is sample output - yours may be different.
-1

while $i;do `notify-send -t 200 "You are awesome :)"`;sleep 60; done;

pahnin · 2011-02-14 18:49:38 7
Clear Cached Memory on Ubuntu

"That's it. Not much to see here. The first command writes any cache data that hasn't been written to the disk out to the disk. The second command tells the kernel to drop what's cached. Not much to it. This invalidates the write cache as well as the read cache, which is why we have the sync command first. Supposedly, it is possible to have some cached write data never make it to disk, so use it with caution, and NEVER do it on a production server. You could ... but why take the risk? As long as you are running a post 2.6.16 kernel,..." Source: http://ubuntuforums.org/showpost.php?p=3621283&postcount=1
This is sample output - yours may be different.
-1

sudo sync && sudo echo 3 | sudo tee /proc/sys/vm/drop_caches

StephenJudge · 2012-03-17 08:27:58 13
Useful to check if the disks as of same size or not. Helpful in checking Raid configs
This is sample output - yours may be different.
-1

df | awk '{if ($2!=dspace) print "different"; dspace=$2;}'

adimania · 2013-03-08 12:09:35 14
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 10
Shuffle mp3 files in current folder (and subfolders) and play them.

Add `-maxdepth 1` to find to exclude subfolders.
This is sample output - yours may be different.
-1

find . -iname "*.mp3" | mpg123 -Z --list -

bjodah · 2013-12-16 14:07:59 9
Change all instances of a word in all files in the current directory and it's sub-directories

This command will replace all instances of 'foo' with 'bar' in all files in the current working directory and any sub-directories.
This is sample output - yours may be different.
-1

perl -pi -e 's/foo/bar/g' $(grep -rl foo ./*)

dopeman · 2009-03-27 17:21:35 10
For finding out if something is listening on a port and if so what the daemon is.
This is sample output - yours may be different.
-1

lsfo -i :[port number]

unixmonkey11400 · 2010-08-17 19:25:37 3
Get your external IP address

Additionally it may give your geolocation if it's known by hostip.info Show Sample Output
This is sample output - yours may be different.
```
ipv4: 188.165.241.33
hostname: ns390090.ovh.net
city: Roubaix
country: FRANCE (FR)
latitude: 50.7
longitude: 3.1667
```
-1

curl http://my-ip.cc/host.txt

samleb · 2011-09-01 00:28:49 3
find all minimum values in file with at least 100 lines
This is sample output - yours may be different.
-1

for ff in directory; do numLines=`wc -l $ff`; numLines=$(echo $numLines | sed 's/ .*//g'); min=$(sort -nrk 1 $ff | tail -1); if [ $numLines -gt 100 ]; then echo $min >> minValues; fi;done;

user1234 · 2013-09-23 04:04:52 7
return external ip

alternative using 'host' Show Sample Output
This is sample output - yours may be different.
```
67.207.139.81
```
-1

host -t a dartsclink.com | sed 's/.*has address //'

dartsclink · 2009-08-14 16:11:18 13
List complete size of directories (do not consider hidden directories)
This is sample output - yours may be different.
-1

du -sh `ls -p | grep /`

sarcilav · 2010-04-11 02:53:51 11

Get your external IP address

XML version. Additionally it may give your geolocation if it's known by hostip.info Show Sample Output

-1

curl http://my-ip.cc/host.xml

samleb · 2011-09-01 00:30:03 3

Keep gz file after uncompressing
This is sample output - yours may be different.
-1

gunzip -c x.txt.gz >x.txt

zluyuer · 2014-10-24 10:00:21 10
display IP addresses with 5 or more unsuccessful login attempts today

display IP's that unsuccessfully attempted to login 5 or more times today may want to filter any trusted IP's and the localhost useful for obtaining a list IP addresses to block on the firewall Show Sample Output
This is sample output - yours may be different.
```
the output is zero or more IP addresses
```
-1

lastb -i | grep "$(date '+%a %b %d')" | awk '{ print $3 }' | sort | uniq -c | awk '{ if ($1 >= 5) print $2; }'

forestb · 2015-11-20 07:19:20 10
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Check if your desired password is already available in haveibeenpwnd database. This command uses the API provided by HIBP

Capture video of a linux desktop

This will grab the image from desktop, starting with the upper-left corner at x=100, y=200 with a width and height of 1024?768.

Quick and dirty RSS

runs an rss feed through sed replacing the closing tags with newlines and the opening tags with white space making it readable.

Make .bashrc function to backup the data you changed last houres

The original overwrites any previous backups, and only saves exactly the last hours worth, but not 1 hour + 1 minute. This version creates or appends files, and backs up everything since the last backup (using the backups timestamp as the reference), plus it uses TMPDIR if set.

Filter the output of a file continously using tail and grep

The OPs solution will work, however on some systems (bsd), grep will not filter the data, unless the --line-buffered option is enabled.

listen to an offensive fortune

or replace "espeak" with "festival --tts" if you like festival better when your buddy leaves his computer unlocked use "crontab" or "at" to play at some time that would be most embarassing (during his next sales presentation) $ echo "fortune -o | espeak" | at now + 30 minutes of course you can exclude the "-o" for non offensive fortunes, or if you don't have offensive fortunes installed

Execute multiple commands from history

Assuming that 219,229 and 221 are entries in history, I recall them in a single line for execute multiple commands 219 ifdown wlan0 ... 221 ifup wlan0 ... 229 iwconfig wlan0 mode Managed so the result is execution of # ifdown wlan0 ; iwconfig wlan0 mode Managed ; ifup wlan0

dont log current session to history

Be notified about overheating of your CPU and/or motherboard

You'll be notified if your core 1 temperature exceeds 50 degrees, you can change the monitored device by editing the "Core 1" or change the critical temperature by editing the "-gt 50" part. Note: you must have lm-sensors installed and configured in order to get this command working.

Use top to monitor only all processes with the same name fragment 'foo'

$ pgrep foo may return several pids for process foobar footy01 etc. like this: 11427 12576 12577 sed puts "-p " in front and we pass a list to top: $ top -p 11427 -p 12576 -p 12577

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