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Format images for Kindle

optipng *.png http://www.mobileread.com/forums/showpost.php?p=147076&postcount=7 -dither FloydSteinberg produces a more uniform dither than the default.
This is sample output - yours may be different.
0

mogrify -colorspace Gray -rotate '-90>' -resize 600x800 -dither FloydSteinberg -colors 16 -format png *

yoyoyojomo · 2012-02-01 17:16:52 3
Unmuting master channel, printing only percent value, while suppressing other outputs
This is sample output - yours may be different.
0

amixer -c 0 set Master toggle | tail -1 | awk '{print $4}' | sed "s/[^0-9]//g" ; amixer -c 0 set Speaker toggle >/dev/null; amixer -c 0 set Front toggle >/dev/null

dtsip · 2012-06-26 21:18:07 5
UDP over SSH

Forward local UDP port to remotetarget via ssh.
This is sample output - yours may be different.
0

socat udp-listen:1611 system:'ssh remoteserver "socat stdio udp-connect:remotetarget:161"'

kbo · 2013-07-02 15:08:14 5
walk in a directory for specific files and copy it to desired destination

helpful when you see something like this: zsh: argument list too long: cp
This is sample output - yours may be different.
0

for file in ./data/message-snapshots/*.jpg; do cp "$file" /data/digitalcandy/ml/images/; done

ferdous · 2014-06-14 17:26:21 6
Opens Windows internet shortcut files (*.url files) in Firefox.

This command will use grep to read the shortcut (which in the above examle is file.url), and filter out all but the only important line, which contains the website URL, and some extra characters that will need to be removes (for example, URL=http://example.com). The cut command is then used to get rid of the URL= at the beginning. The output is then piped into Firefox, which should interpret the it as a web URL to be opened. Of course, you can replace Firefox with any other broswer. Tested in bash and sh.
This is sample output - yours may be different.
0

firefox "$(grep -i ^url=* file.url | cut -b 5-)"

nachos117 · 2014-10-08 05:56:27 8
check port open without telnet
This is sample output - yours may be different.
0

nc 127.0.0.1 22 < /dev/null; echo $?

kankan55 · 2015-01-20 04:55:51 9
Display how much memory installed on system

This will display the system memory size in kb. If you want to see the value in mb, you can type: grep MemTotal: /proc/meminfo | awk '{printf("MemTotal: %d MB\n",$2/1024)}' Show Sample Output
This is sample output - yours may be different.
```
$ grep MemTotal: /proc/meminfo
MemTotal:       16385508 kB
```
0

grep MemTotal: /proc/meminfo # display how much memory installed

mpb · 2015-05-15 09:19:02 17
list the open files for a particular process ID
This is sample output - yours may be different.
0

lsof -p PID

blasetherexaler · 2015-11-11 02:55:39 11
bulk rename files with GNU Parallel

Works with any file name: space, ', " and even \n is OK. The code in {= =} is a perl expression.
This is sample output - yours may be different.
0

parallel -0 mv {} {=s/foo/bar/g=} ::: *

unixmonkey91589 · 2015-12-25 17:22:43 12
Find the top most 5 duplicate files in a folder

To allow recursivity : find -type f -exec md5sum '{}' ';' | sort | uniq -c -w 33 | sort -gr | head -n 5 | cut -c1-7,41- Display only filenames : find -maxdepth 1 -type f -exec md5sum '{}' ';' | sort | uniq -c -w 33 | sort -gr | head -n 5 | cut -c43- Show Sample Output
This is sample output - yours may be different.
```
     50 ./file17.txt
     32 ./file44.txt
     11 ./file72.txt
      5 ./file29.txt
      3 ./file53.txt
```
0

find -maxdepth 1 -type f -exec md5sum '{}' ';' | sort | uniq -c -w 33 | sort -gr | head -n 5 | cut -c1-7,41-

MaDCOw · 2017-02-09 11:36:31 18
Execute the last line of output from the previous command

alex@alex-box:~$ sl The program 'sl' is currently not installed. You can install it by typing: sudo apt-get install sl alex@alex-box:~$ dolast Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: sl 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
This is sample output - yours may be different.
0

alias dolast='$( $(history 2| head -n 1| sed "s/.* //") 2>&1 | tail -n 1)'

aheinous · 2017-02-25 01:26:49 19
Change all the files on your system that have the OLDGID group by the new NEWGID.

It's change the group id of all the files on your system that have the OLDGID group as the owner group by the new NEWGID. But first do this: Document which files will be changed, use: find / -gid OLDGID ! -type l > resplado-gid.txt Be sure to disconnect users from the old group. Stop demons or services associated with the group. Be sure the new group exist and take note of GID
This is sample output - yours may be different.
0

$ find / -gid OLDGID ! -type l -exec chgrp NEWGID {} \;

rcorrea · 2017-08-09 21:37:51 18
Remove multiple entries of the same command in .bash_history with preserving the chronological order

Only the first appearance of a repeated command in the history will be kept. Otherwise, if you prefer to keep last occurrence of a repeated command then maybe you can achieve that by including reverse input/output i.e with 'tac' command in expression above. To see statistics of removed repeated commands: diff --suppress-common-lines -y ~/.bash_history.bak ~/.bash_history|uniq -c|sort -n|tr -s " "|sed '/^ 1/d'|grep '<'
This is sample output - yours may be different.
0

cp -a ~/.bash_history ~/.bash_history.bak && perl -ne 'print unless $seen{$_}++' ~/.bash_history.bak >~/.bash_history

knoppix5 · 2019-04-15 12:39:09 71
Rotate the X screen via xrandr

You need the RANDR support enable, to enable it with an ATI card run: aticonfig --set-pcs-str="DDX,EnableRandr12,TRUE" To show your available output run: xrandr -q -d [yourdisplay]
This is sample output - yours may be different.
0

xrandr --output [youroutput] --rotate [right|left|normal] -d [yourdisplay]

michelem · 2009-02-05 18:28:43 29
Top like mysql monitor

mytop is a top like monitor for displaying Mysql server statistic and performance. Part of mytop package ,tested on Debian.
This is sample output - yours may be different.
0

mytop --prompt

servermanaged · 2009-05-19 19:04:57 5
Grep through the text of djvu files and format results

Count the occurences of the word 'Berlekamp' in the DJVU files that are in the current directory, printing file names from the one having the least to the most occurences.
This is sample output - yours may be different.
0

find ./ -iname "*.djvu" -execdir perl -e '@s=`djvutxt \"$ARGV[0]\"\|grep -c Berlekamp`; chomp @s; print $s[0]; print " $ARGV[0]\n"' '{}' \;|sort -n

unixmonkey4437 · 2010-04-07 11:15:26 8
Check whether laptop is running on battery or cable
This is sample output - yours may be different.
0

cat /proc/acpi/ac_adapter/ACAD/state

takeshin · 2010-06-10 08:02:09 4
resize all JPG images in folder and create new images (w/o overwriting)
This is sample output - yours may be different.
0

ls *.JPG | cut -d . -f 1 | xargs -L1 -i convert -resize 684 {}.JPG {}.jpg

homoludens · 2010-09-12 19:47:38 3
Untar a directory in a tar file over ssh

This may be listed already but this command is useful to untar a specific directory to a different server.
This is sample output - yours may be different.
0

cat tarfile.tar.gz | ssh server.com " cd /tmp; tar xvzf - directory/i/want"

alf · 2011-02-11 17:10:01 4
Convert vcd to avi format

Convert VCD to .AVI
This is sample output - yours may be different.
0

mencoder vcd://2 -o sample.avi -oac copy -ovc lavc -lavcopts vcodec=mpeg4

mmghaseminya · 2011-10-02 17:25:14 3
Get the total length of all video / audio in the current dir (and below) in H:m:s

Improvement on Coderjoe's Solution. Gets rid of grep and cut (and implements them in awk) and specifies some different mplayer options that speed things up a bit. Show Sample Output
This is sample output - yours may be different.
```
02:23:58
```
0

find /path/to/dir -iname "*.ext" -print0 | xargs -0 mplayer -really-quiet -cache 64 -vo dummy -ao dummy -identify 2>/dev/null | awk '/ID_LENGTH/{gsub(/ID_LENGTH=/,"")}{SUM += $1}END{ printf "%02d:%02d:%02d\n",SUM/3600,SUM%3600/60,SUM%60}'

DarkSniper · 2012-03-11 12:28:48 3
Find a file with a certail date stamp
This is sample output - yours may be different.
0

cp -p `ls -l | awk '/Apr 14/ {print $NF}'` /usr/users/backup_dir

akashrpatel · 2012-12-27 19:12:08 4
Shutdown ubuntu
This is sample output - yours may be different.
0

sudo shutdown -h now

permanaj · 2013-04-23 02:34:48 5
Gets the X11 Screen resolution
This is sample output - yours may be different.
0

xdpyinfo | grep dimensions | awk '{print $2}'

sgnn7 · 2013-12-06 17:49:40 6
Display thread information in ps
This is sample output - yours may be different.
0

ps m

blasetherexaler · 2015-11-11 02:57:41 9
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What's this?

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Copy all files. All normal files, all hidden files and all files starting with - (minus).

./* is for copying files starting with - .[!.]* is for copying hidden files and avoiding copying files from the parent directory. ..?* is for copying files starting with .. (avoids the directory ..) /path/to/dir the path to the directory where the files should be copied Can also be used as a script. Input argument is /path/to/dir in tcsh, replace .[!.]* with .[^.]*

Short Information about loaded kernel modules

Run this as root, it will be helpful to quickly get information about the loaded kernel modules.

List all available commands (bash, ksh93)

kill all running instances of wine and programs runned by it (exe)

Look mah! All pipes

Check if it's OK to spawn tmux. Bool's Rools.

The command cechks if we are connected to a X11 console, if the $TERM var noct yet contains a "screen" derivat, and only then attachs to tmux. You could add a test for interactive shell [[ $- == *i* ]] but your .bashrc has that already, I bet.

Stream YouTube URL directly to mplayer.

This is the result of a several week venture without X. I found myself totally happy without X (and by extension without flash) and was able to do just about anything but watch YouTube videos... so this a the solution I came up with for that. I am sure this can be done better but this does indeed work... and tends to work far better than YouTube's ghetto proprietary flash player ;-) Replace $i with any YouTube ID you want and this will scrape the site for the _real_ URL to the full quality .FLV file on Youtube's server and will then will hand that over to mplayer (or vlc or whatever you want) to be streamed. In some browsers you can replace $i with just a % or put this in a shell script so all YouTube IDs can be handed directly off to your media player of choice for true streaming without the need for Flash or a downloader like clive. (I do however fully recommend clive if you wish to archive videos instead of streaming them) If any interest is shown I would be more than happy to provide similar commands for other sites. Most streaming flash players use similar logic to YouTube. Edit: 05/03/2011 - Updated line to work with current YouTube. It could be a lot prettier but I will probably follow up with another update when I figure out how to get rid of that pesky Grep. Sed should take that syntax... but it doesn't. Original (no longer working) command: mplayer -fs $(echo "http://youtube.com/get_video.php?$(curl -s $youtube_url | sed -n "/watch_fullscreen/s;.*$video_id.\+$&title.*;\1;p")")

Rapidly invoke an editor to write a long, complex, or tricky command

Next time you are using your shell, try typing ctrl-x e (that is holding control key press x and then e). The shell will take what you've written on the command line thus far and paste it into the editor specified by $EDITOR. Then you can edit at leisure using all the powerful macros and commands of vi, emacs, nano, or whatever.

re-assign line numbers

list block devices

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

Give webpage status code

this function will give you a status webpage code using curl.

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