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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
sets volume via command line

adjusts the 'Master' channel's volume up by 1dB. Can use command 'amixer' to see other channels : Simple mixer control 'Master',0 or Simple mixer control 'Capture',0 Show Sample Output
This is sample output - yours may be different.
```
Simple mixer control 'Master',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined
  Playback channels: Mono
  Limits: Playback 0 - 255
  Mono: Playback 55 [22%] [-50.00dB] [on]
```
0

amixer -c 0 set Master 1dB+

chrisp6825 · 2013-07-25 15:28:45 10
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Find default gateway (proper at ppp connections too)

Recursively grep thorugh directory for string in file.

-R, -r, --recursive Read all files under each directory, recursively; this is equivalent to the -d recurse option.

Batch edition of all OpenOffice.org Writer files in the current directory (body text)

This function does a batch edition of all OOO3 Writer files in current directory. It uses sed to search a FOO pattern into body text of each file, then replace it to foo pattern (only the first match) . I did it because I've some hundreds of OOO3 Writer files where I did need to edit one word in each ones and open up each file in OOO3 gui wasn't an option. Usage: bsro3 FOO foo

Find the package that installed a command

batch convert Nikon RAW (nef) images to JPG

converts RAW files from a Nikon DSLR to jpg for easy viewing etc. requires ufraw package

sum numbers in the file (or stdin)

add integers from the stdin and print out the result usually, cat /tmp/file | echo $(($(tr '\n' '+')0))

Rip DVD to YouTube ready MPEG-4 AVI file using mencoder

Rip DVD to YouTube ready AVI file, using MPEG-4 video codec and MP3 audio codec. Resizes to 320x240 and deinterlaces as needed.

shut of the screen ( Fool proof )

Use the command to create a script and bind it to a key using keyboard shortcut. eg: Script locks the screen in a loop until the command is executed again.At first it

Restart command if it dies.

works well in crontab.

Sort files in folders alphabetically

Creates one letter folders in the current directory and moves files with corresponding initial in the folder.

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