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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
Use Ruby version permanently

Ruby Version Manager (RVM) - https://rvm.io/ Show Sample Output
This is sample output - yours may be different.
```
Using /Users/weng/.rvm/gems/ruby-1.9.3-p448
```
0

rvm --default use ruby-1.9.3

99RedBalloons · 2013-10-04 02:43:59 199
thunderbird commandline invocation to attach email

Opens a window with $1 attached and ready to send.
This is sample output - yours may be different.
0

thunderbird -compose "attachment='file://`pwd`/$*'"

tobi · 2014-01-08 12:22:50 11
Convert serialized PHP data into JSON

Pipe serialized data into the command.
This is sample output - yours may be different.
0

php -r 'echo json_encode( unserialize( file_get_contents( "php://stdin" ) ) );'

westonruter · 2014-07-14 17:09:21 8
To debug asterisk start process
This is sample output - yours may be different.
0

bash -x /etc/init.d/asterisk start

nomikos · 2014-11-05 23:18:45 7
Linux: find names non non-virtual network interfaces

This is used to find externally accessible network interfaces; interfaces that others can connect to us with. By then finding the IP address of these interfaces, we can find addresses that other hosts would use in order to connect to us. Show Sample Output
This is sample output - yours may be different.
```
localhost core # ls -l /sys/class/net/ | grep /devices/ | grep -v /virtual/ | awk '{print $9}'
ens32
```
0

ls -l /sys/class/net/ | grep /devices/ | grep -v /virtual/ | awk '{print $9}'

marksheahan · 2015-02-26 18:46:07 8
Recursively remove directories less than specified size

Removes directories which are less than 1028KB total. This works for systems where blank directories are 4KB. If a directory contains 1 MB (1024KB) or less, it will remove the directory using a path relative to the directory where the command was initially executed (safer than some other options I found). Adjust the 1028 value for your needs. It would be helpful to test the results before proceeding with the removal. Simply run all but the last two commands to see a list of what will be removed: du | awk '{if($1<1028)print;}' | cut -d $'\t' -f 2- If you're unsure what size a blank folder is, test it like this: mkdir test; du test; rmdir test
This is sample output - yours may be different.
0

du | awk '{if($1<1028)print;}' | cut -d $'\t' -f 2- | tr "\n" "\0" | xargs -0 rm -rf

i814u2 · 2015-06-25 16:00:48 11
Copy your ssh public key to a server from a machine that doesn't have ssh-copy-id

This is what I use. You will need netcat installed on both machines. http://stackoverflow.com/a/39323186/3006854
This is sample output - yours may be different.
0

ssh user@host -c 'nc -l 55555 >> ~/.ssh/authorized_keys' & nc HOSTNAME 55555 < ~/.ssh/id_rsa.pub

keith · 2017-04-19 12:39:51 24
Quickly clean log files (assuming you don't want them anymore)

you don't need to echo, just a plain redirect is enough to empty the file
This is sample output - yours may be different.
0

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

svg · 2009-07-03 17:38:21 8

WPA/WPA2 ESSID and password automation with pyrit

This command will automate the creation of ESSIDs and batch processing in pyrit. Give it a list of WPA/WPA2 access points you're targeting and it'll import those ESSIDs and pre-compute the potential password hashes for you, assuming you've got a list of passwords already imported using: pyrit -i dictionary import_passwords Once the command finishes, point pyrit to your packet capture containing a handshake with the attack_db module. Game over. Show Sample Output

gopyrit () { if [ $# -lt 1 ]; then echo $0 '< list of ESSIDs >'; return -1; fi; for i in "$@"; do pyrit -e $i create_essid && pyrit batch; done; pyrit eval }

meathive · 2010-06-19 01:11:00 7

recursive transform all contents of files to lowercase
This is sample output - yours may be different.
0

perl -e "tr/[A-Z]/[a-z]/;" -pi.save $(find . -type f)

miccaman · 2010-11-25 12:48:39 4
Perl One Liner to Generate a Random IP Address
This is sample output - yours may be different.
0

perl -e 'printf join ".", map int rand 256, 1 .. 4;'

gml · 2011-01-16 02:15:29 6
Create a Christmas tree with perl

Require: perl -MCPAN -e 'install Acme::POE::Tree' From: http://www.catonmat.net/blog/christmas-tree-in-the-shell/
This is sample output - yours may be different.
0

perl -MAcme::POE::Tree -e 'Acme::POE::Tree->new()->run()'

anhpht · 2011-10-13 10:33:31 4
Mount a partitoned disk-image file

Mounts a disk-image of a hdd with partitions
This is sample output - yours may be different.
0

IMG="image.img";PART=1;mount -o loop,ro,offset=$(parted $IMG -s unit b print|awk '$1=='$PART' {sub(/B/,"",$2);print $2}') $IMG /mnt/whatever

AndroTux · 2011-12-31 14:58:18 3

Python unicode `explain`

vs. map(unicodedata.name, u'\u2022') Show Sample Output

import unicodedata; map(unicodedata.name, '\u2022'.decode('ascii'))

evandrix · 2012-09-11 10:01:39 4

Join the lines with comma

A more simple way to join lines with paste command than sed. Show Sample Output
This is sample output - yours may be different.
```
line1,line2
```
0

paste -sd, <<< $'line1\nline2'

kodango · 2012-11-13 01:26:05 4
Get unique basewords from Hashcat pot
This is sample output - yours may be different.
0

cut -f 2 -d ':' oclHashcat.pot | egrep -oi '[a-z]{1,20}' | sort | uniq > base.pot

Creek · 2014-07-14 21:03:22 6
slow down/speed up video file
This is sample output - yours may be different.
0

mencoder -speed 2 -o output.avi -ovc lavc -oac mp3lame input.avi

FreedomBen · 2014-11-05 23:57:34 7
Show first IPv4 address for an interface without CIDR mask

Given a network interface (eth0 in this example), find its ip address, without CIDR netmask. Show Sample Output
This is sample output - yours may be different.
```
localhost core # ip addr show dev eth0 | grep -E '\binet\b' | sed 's|.*inet $[^/]*$/.*|\1|' | head -n 1
192.168.128.197
```
0

ip addr show dev eth0 | grep -E '\binet\b' | sed 's|.*inet $[^/]*$/.*|\1|' | head -n 1

marksheahan · 2015-02-26 19:07:10 8
Send pop-up notifications on Gnome
This is sample output - yours may be different.
0

zenity --info --text="I'am a popup"

fundor333 · 2016-08-12 19:04:59 14
Export only one SVG element by ID.

-z, --without-gui -j, --export-id-only -i, --export-id=ID -l, --export-plain-svg=FILENAME In Inkscape Press Ctrl-Shift-o to open object properties panel to give ID to a selected element
This is sample output - yours may be different.
0

inkscape project.svg -z -j -i icon.svg -l b.svg

atemvm · 2018-05-15 14:16:35 185
set timestamp in exif of a image
This is sample output - yours may be different.
0

exiv2 -M"set Exif.Photo.DateTimeOriginal `date "+%Y:%m:%d %H:%M:%S"`" filename.jpg

gecco · 2009-03-18 10:53:46 5
Equivelant of a Wildcard

This is exactly the same as a wildcard - good for times when wildcards are disabled and when you want have a wildcard of a directory that is not your current ({`ls /path/to/dir`}). Does not work on older versions of Bash though.
This is sample output - yours may be different.
0

`ls`

matthewbauer · 2009-08-17 03:56:05 7
Dump all of perl's config info

This dumps all of your installed perl's config information.
This is sample output - yours may be different.
0

perl -le 'use Config; foreach $i (keys %Config) {print "$i : @Config{$i}"}'

chuckr · 2009-09-22 22:14:21 4
Better "hours of video" summary for each file/dir in the current directory

I know this has been beaten to death but finding video files using mime types and printing the "hours of video" for each directory is (IMHO) easier to parse than just a single total. Output is in minutes. Among the other niceties is that it omits printing of non-video files/folders PS: Barely managed to fit it within the 255 character limit :D Show Sample Output
This is sample output - yours may be different.
```
Fundamentals Of Physics - 1724.32
Google Techtalks - 258.292
Introduction to Algorithms - 1805.26
Linear Algebra - 1675.23
```
0

for item in *;do echo -n "$item - ";find "$item" -type f -print0 | xargs -0 file -iNf - | grep video | cut -d: -f1 | xargs -d'\n' /usr/share/doc/mplayer/examples/midentify | grep ID_LENGTH | awk -F= '{sum+=$2} END {print(sum/60)}'; done | grep -v ' - 0$'

jnash · 2009-11-19 06:28:15 3
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Check all bash scripts in current dir for syntax errors

Check all bash scripts in current dir for syntax errors WITHOUT running them.

List out classes in of all htmls in directory

Lists out all classes used in all *.html files in the currect directory. usefull for checking if you have left out any style definitions, or accidentally given a different name than you intended. ( I have an ugly habit of accidentally substituting camelCase instead of using under_scores: i would name soemthing counterBox instead of counter_box) WARNING: assumes you give classnames in between double quotes, and that you apply only one class per element.

find the difference between two nodes

Alias for lazy tmux create/reattach

If a tmux session is already running attach it, otherwise create a new one. Useful if you often forget about running tmuxes (or just don't care)

list block devices

Shows all block devices in a tree with descruptions of what they are.

Find usb device

I often use it to find recently added ou removed device, or using find in /dev, or anything similar. Just run the command, plug the device, and wait to see him and only him

Get your external IP address ( 10 characters long )

Shortest url to a external IP-service, 10 characters.

Drop all tables from a database, without deleting it

Uses two comands, requieres mysqldump, but works as expected.

Find total Terabytes written to a SSD

You must have smartmontools installed for this to work. This also assumes you 512 byte sector sizes, this is pretty standard.

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