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Auto export display when coming from SSH

In some case, you need to use remote gui on servers or simple machines and it's boring to see "cannot open display on ..." if you forgot to export your display. Juste add this line in .bashrc on remote machine. Dont forget to allow remote client on your local X server : xhost +
This is sample output - yours may be different.
0

[ -n "$SSH_CLIENT" ] && export DISPLAY=$(echo $SSH_CLIENT | awk '{ print $1 }'):0.0

GouNiNi · 2010-04-14 08:19:37 8
AIX: Set reserve lock=no in EMC disks that have reserve_lock=yes

It will change the reserve_lock attribute to all AIX EMC disk attached.
This is sample output - yours may be different.
0

for i in $(lsdev -Cc disk | grep EMC | cut -f 1 -d " " ); do if lsattr -a reserve_lock -El $i | grep -q "reserve_lock yes"; then chdev -a reserve_lock=no -l $i; fi; done

keymon · 2010-05-14 11:48:39 3
count how many cat processes are running
This is sample output - yours may be different.
0

pgrep -c cat

ioggstream · 2010-09-24 22:42:12 3
same as backspace and return

Backspace and Return/Enter equivalents
This is sample output - yours may be different.
0

<ctrl+h> and <ctrl+j>

retrodanny · 2011-01-15 21:20:09 6
Let yourself read the logs under /var/log/apache2 (on Debian)
This is sample output - yours may be different.
0

sudo usermod -a -G adm "$(whoami)"

unixmonkey17279 · 2011-02-18 16:01:59 3
use awk to replace field with it's md5sum

Source: http://www.eggheadcafe.com/software/aspnet/35700746/calculating-md5sum-strings-from-within-awk.aspx Show Sample Output
This is sample output - yours may be different.
```
In:
joe 123456789 fdfdsajk
bob 125344325 dfjsakl

Out:
joe b2cfa4183267af678ea06c7407d4d6d8 fdfdsajk
bob f052b6bf06cde7c020543ed6f7bc1146 dfjsakl
```
0

awk '{command="echo "$2"|md5sum" ;command | getline $2; close(command);sub(/[[:blank:]].*/,"",$2); print $0}'

erichelgeson · 2011-05-10 15:11:36 3
list uniq extensions of files from the current directory

find files recursively from the current directory, and list the extensions of files uniquely Show Sample Output
This is sample output - yours may be different.
```
bak
bat
cfg
conf
csv
doc
exe
exe_back
pyc
sql
txt
xls
```
0

find . -type f |egrep '^./.*\.' |sed -e "s/$^.*\.$$.*$$/\2/" |sort |uniq

dvst · 2012-11-12 17:17:55 8
export key-value pairs list as environment variables

This exports all lines of input file as environment variables, assuming each line is like these: OH=YEAH FU=UUUU
This is sample output - yours may be different.
0

while read line; do export $line; done < <(cat input)

dario · 2013-03-15 08:14:04 10
Convert Canon CR2 raw pictures to JPG

This command takes all CR2 files in the current directory and convert them into JPG
This is sample output - yours may be different.
0

for i in *.CR2; do dcraw -c -a -h $i | ppmtojpeg > `basename $i CR2`JPG; echo $i done; done

optyler · 2013-07-25 14:58:15 5
Open Android Virtual Device Manager (Mac OS)

This command will open the AVD Manager in Mac OS X.
This is sample output - yours may be different.
0

/usr/bin/java -Xmx256M -XstartOnFirstThread -Dcom.android.sdkmanager.toolsdir=android-sdk/tools -classpath android-sdk/tools/lib/sdkmanager.jar:android-sdk/tools/lib/swtmenubar.jar:android-sdk/tools/lib/x86_64/swt.jar com.android.sdkmanager.Main avd

99RedBalloons · 2013-10-04 02:39:00 84
Generate all possible combinations between aaa 999

tr ' ' '\n' isn't needed, it's just there to make the output prettier. Show Sample Output
This is sample output - yours may be different.
```
...
8Q0
8Q1
8Q2
8Q3
8Q4
8Q5
8Q6
8Q7
8Q8
8Q9
8Ra
8Rb
8Rc
8Rd
8Re
8Rf
8Rg
8Rh
8Ri
8Rj
8Rk
8Rl
8Rm
8Rn
8Ro
8Rp
...
```
0

echo {{a..z},{A..Z},{0..9}}{{a..z},{A..Z},{0..9}}{{a..z},{A..Z},{0..9}} | tr ' ' '\n'

freja · 2015-06-25 15:24:29 9
Copy a file using dd and watch its progress

Recent versions of dd provides status flag. Setting that flag to progress shows progress in realtime.
This is sample output - yours may be different.
0

dd status=progress if=infile of=outfile bs=512

tankmohit11 · 2017-03-15 05:46:25 21
Test internet connection
This is sample output - yours may be different.
0

if nc -zw1 google.com 443 2>/dev/null; then echo 'Connected!'; fi

keith · 2017-04-19 12:18:43 32
Locate Hacked Files and Dump.

This will check all .HTML file contents for the word "Hacked" and dump it to hacklog.txt. This is great for located all those files affected by nasty Joomla exploits. Change the .HTML to any other extension you wish to check, and of course the word "HACKED" for other searches.
This is sample output - yours may be different.
0

find . -type f -name '*.html' -exec grep -H HACKED {} \; > hacklog.txt

nullrouter · 2009-02-16 08:57:25 84

Today's date on a yearly calendar... credits to http://lifehacker.com/250825/cli-fun--todays-date-on-a-yearly-calendar Show Sample Output

cal -y | tr '\n' '|' | sed "s/^/ /;s/$/ /;s/ $(date +%e) / $(date +%e | sed 's/./#/g') /$(date +%m | sed s/^0//)" | tr '|' '\n'

luishka · 2009-05-26 20:31:26 715

Quickly clean log files (assuming you don't want them anymore)

Empties all files in /var/log over 5000k. Useful if /var goes crazy or if you just haven't cleaned up in a while.
This is sample output - yours may be different.
0

for file in `find /var/log/ -type f -size +5000k`; do echo " " > $file; done

jemmille · 2009-07-03 16:26:36 6
Check the apt security keys

For example: check the APT security keys to make sure the Google digital signature was imported correctly Show Sample Output
This is sample output - yours may be different.
```
uid                  Google, Inc. Linux Package Signing Key
<linux-packages-keymaster@google.com>
sub   2048g/C07CB649 2007-03-08
```
0

apt-key list

0disse0 · 2009-09-03 19:32:11 3
Extract all urls from last firefox sessionstore used in a portable way.

If you want all the URLs from all the sessions, you can use : perl -lne 'print for /url":"\K[^"]+/g' ~/.mozilla/firefox/*/sessionstore.js Thanks to tybalt89 ( idea of the "for" statement ). For perl purists, there's JSON and File::Slurp modules, buts that's not installed by default.
This is sample output - yours may be different.
0

perl -lne 'print for /url":"\K[^"]+/g' $(ls -t ~/.mozilla/firefox/*/sessionstore.js | sed q)

sputnick · 2009-12-14 00:51:54 2
Test internet connectivity

8.8.8.8 and 8.8.4.4 are two Google public DNS. As their address is really simple, it's easy to use this command to test if Internet is reachable. Beware of large corporate networks however, that may use this address on router's loopbacks interfaces.
This is sample output - yours may be different.
0

ping 8.8.8.8

petrus · 2011-02-18 19:51:36 93

# Multiline paragraph sort; with case insensitive option (-i)

Among other things, this allows the sorting of comment descriptions and command lines retrieved as text from CommandLineFu.com. Show Sample Output

gawk 'BEGIN {RS="\n\n"; if (ARGV[1]=="-i"){IGNORECASE=1; ARGC=1}};{Text[NR]=$0};END {asort(Text);for (i=1;i<=NR;i++) printf "%s\n\n",Text[i] }' -i<Zip.txt

IF_Rock · 2011-05-10 19:08:27 5

Create a temp file

Another way to create temp files in your scripts, if tempfile fails, it will create a hidden local file in the current directory, don't forget to delete $FILE
This is sample output - yours may be different.
0

FILE=$(tempfile 2>/dev/null || echo .$RANDOM)

h3nr1x · 2011-06-22 15:12:21 3
Gets the english pronunciation of a phrase

No need to install additional packages eg: say hello For multiword say how+are+you
This is sample output - yours may be different.
0

say() { wget -q -U Mozilla -O output.mp3 "http://translate.google.com/translate_tts?tl=en&q=$1"; gnome-terminal -x bash -c "totem output.mp3"; sleep 4; totem --quit;}

totti · 2011-09-07 19:48:53 3
Get all links of a website

This will get all links from a given URL, remove any duplicates, and output the result.
This is sample output - yours may be different.
0

lynx -dump http://example.com/ | awk '/http/{print $2}' | sort -u

mathias · 2011-10-13 09:49:36 6
Add ofxAddons mentioned in source files, into addons.make

ofxGui ofxFX
This is sample output - yours may be different.
0

grep -hor ofx[a-zA-Z]*.h src/ | grep -o ofx[^\.]* >> addons.make

egeoffray · 2013-03-15 11:29:50 6
Use wpa_supplicant to access a wifi AP without using a .conf file

If you need to hop on a wifi fast, perhaps you're fixing a system and it's read-only this command pipes the output of wpa_passphrase used to generate a .conf file and instead reads it from the standard input stream. The -i switch for interface may not be wlan0, as udev will change it. A quick "ifconfig" or "dmesg | grep wlan0" will show you the wireless interface name.
This is sample output - yours may be different.
0

wpa_passphrase "ESSID" "Password" | wpa_supplicant -Dwext -iwlan0 -c/dev/stdin&

adamrights · 2013-05-07 11:05:50 7
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Group OR'd commands where you expect only one to work

Something to stuff in an alias when you are working in multiple environments. The double-pipe OR will fall through until one of the commands succeeds, and the rest won't be executed. Any STDERR will fall out, but the STDOUT from the correct command will bubble out of the parenthesis to the less command, or some other command you specify.

See entire packet payload using tcpdump.

This command will show you the entire payload of a packet. The final "s" increases the snaplength, grabbing the whole packet.

Stream system sounds over rtmp

sox (SOund eXchange) can capture the system audio be it a browser playing youtube or from hardware mic and can pipe it to ffmpeg which encodes it into flv and send it over rtmp. Tested using Red5 rtmp server.

Display a list of RPMs installed on a particular date

Find out which RPMs were installed on a particular date. These would (naturally) include update RPMs. This example shows searching for "Thu 05 Mar" (with grep). Alternatively, pipe it to less so you can search inside less (with less's neat text highlighting of the search term): rpm -qa --queryformat '%{installtime} \"%{vendor}\" %{name}-%{version}-%{release} %{installtime:date}\n' | less # (this example) search term: Thu 05 Mar

Find UTF-8 text files misinterpreted as ISO 8859-1 due to Byte Order Mark (BOM) of the Unicode Standard.

Character: "?" is the Byte Order Mark (BOM) of the Unicode Standard. Specifically it is the hex bytes EF BB BF, which form the UTF-8 representation of the BOM, misinterpreted as ISO 8859/1 text instead of UTF-8.

Show log message including which files changed for a given commit in git.

Squish repeated delimiters into one

This can be particularly useful used in conjunction with a following cut command like $echo "hello::::there" | tr -s ':' | cut -d':' -f2 which prints 'there'. Much easier that guessing at -f values for cut. I know 'tr -s' is used in lots of commands here already but I just figured out the -s flag and thought it deserved to be highlighted :)

make, or run a script, everytime a file in a directory is modified

Uses inotifywait from inotify-tools ( http://wiki.github.com/rvoicilas/inotify-tools/ ), that is compatible only with linux. Usefull when you work with files that have to be compiled.. latex, haml, c..

Report bugs in Ubuntu

As of 10.04 LTS, you need to use this command-line to reports bugs to the launchpad.net tracking system (you need a launchpad acct for this to work). This command is preferred over using the website because it collects/sends info about your system to help developers. ubuntu-bug is a symlink to apport-bug which sees if KDE/Gnome is running and calls apport-gtk/apport-kde dialogs, otherwise apport-cli, so you can fill out a bug report. First run 'ubuntu-bug' without args to see a list of known symptoms. If there's no matching symptom, or you know which package is to blame, then run 'ubuntu-bug <package>'. If the process is still running, use 'ubuntu-bug <PID>'

move all files older than 60 days to a folder

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