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This is sample output - yours may be different.

gnu@robby:~$ mencoder -idx out2.ogv -ovc lavc -oac mp3lame -audiofile /home/gnu/snowballz/data/music/snowballz2.mp3  -o snow.avi
MEncoder 2:1.0~rc2-0ubuntu19 (C) 2000-2007 MPlayer Team
CPU: Intel(R) Pentium(R) D CPU 2.80GHz (Family: 15, Model: 4, Stepping: 7)
CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled with runtime CPU detection.
success: format: 0  data: 0x0 - 0x76c7ec5
Ogg stream 0 is of an unknown type
[Ogg] stream 1: video (Theora v3.2.1), -vid 0
Ogg file format detected.
VIDEO:  [theo]  1024x768  24bpp  15.000 fps    0.0 kbps ( 0.0 kbyte/s)
Audio file file format detected.
[V] filefmt:65536  fourcc:0x6F656874  size:1024x768  fps:15.00  ftime:=0.0667
==========================================================================
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
AUDIO: 44100 Hz, 2 ch, s16le, 192.0 kbit/13.61% (ratio: 24000->176400)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
==========================================================================
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
[theora @ 0x88423b0]Missing extradata!
Could not open codec.
VDecoder init failed :(
Opening video decoder: [theora] Theora/VP3
VDec: vo config request - 1024 x 768 (preferred colorspace: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
videocodec: libavcodec (1024x768 fourcc=34504d46 [FMP4])
Selected video codec: [theora] vfm: theora (Theora (free, reworked VP3))
==========================================================================
MP3 audio selected.
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Pos: 169.7s   2546f ( 0%) 12.61fps Trem:   0min   0mb  A-V:0.139 [815:231]
Skipping frame!
Pos: 170.4s   2557f ( 0%) 12.62fps Trem:   0min   0mb  A-V:0.135 [816:230]
Skipping frame!
Pos: 331.8s   4979f ( 0%) 13.60fps Trem: 603min 3609mb  A-V:0.102 [791:230]
Flushing video frames.
Writing index...
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.

Video stream:  791.586 kbit/s  (98948 B/s)  size: 32831029 bytes  331.800 secs  4979 frames

Audio stream:  230.839 kbit/s  (28854 B/s)  size: 4917529 bytes  170.423 secs

mencoder -idx Your_Input_Video_File -ovc lavc -oac mp3lame -audiofile Your_Audio_track.mp3 -o Output_File.avi

eastwind · 2009-12-11 23:50:37 3

Duplicate several drives concurrently

If you have some drive imaging to do, you can boot into any liveCD and use a commodity machine. The drives will be written in parallel. To improve efficiency, specify a larger block size in dd: dd if=/dev/sda bs=64k | tee >(dd of=/dev/sdb bs=64k) | dd of=/dev/sdc bs=64k To image more drives , insert them as additional arguments to tee: dd if=/dev/sda | tee >(dd of=/dev/sdb) >(dd of=/dev/sdc) >(dd of=/dev/sdd) | dd of=/dev/sde
This is sample output - yours may be different.
23

dd if=/dev/sda | tee >(dd of=/dev/sdb) | dd of=/dev/sdc

nerd65536 · 2009-12-11 17:34:38 12
validate xml in a shell script.

For debian likes, that's in python-xml package.
This is sample output - yours may be different.
-1

xmlproc_parse.python-xml &>/dev/null <FILE> || exit 1

sputnick · 2009-12-11 17:30:03 5
validate xml in a shell script using xmllint
This is sample output - yours may be different.
1

xmllint --noout some.xml 2>&1 >/dev/null || exit 1

putnamhill · 2009-12-11 16:36:21 6
Print line numbers

Print out contents of file with line numbers. This version will print a number for every line, and separates the numbering from the line with a tab. Show Sample Output
This is sample output - yours may be different.
```
1     This is line 1.
2     This is line 2.
3
4     This is line 4.
```
-1

sed = <file> | sed 'N;s/\n/\t/'

jgc · 2009-12-11 14:39:14 3
List the size (in human readable form) of all sub folders from the current location

Parsing the output of ls is never a good idea for any reason. Using find this way: - works with files that have spaces in their names. - actually lists "sub folders" and not of all files and folders. - does not break if there are a huge number of files in the current directory.
This is sample output - yours may be different.
-6

find . -maxdepth 1 -type d -not -name . -exec du -sh {} +

sorpigal · 2009-12-11 14:37:26 4
Change your swappiness Ratio under linux

This command allow you to set the swappiness var at 50 (default is 60). The value interval must be set between 0 and 100. If swappiness is high=Swap usage is high, if swappiness is low=Ram usage is high.
This is sample output - yours may be different.
8

sysctl vm.swappiness=50

marousan · 2009-12-11 10:40:21 7
Find the ratio between ram usage and swap usage.

it provides the ratio used for the RAM and The SWAP under Linux. When swappiness is high, Swap usage is high. When swappiness is low, Ram usage is high. Show Sample Output
This is sample output - yours may be different.
```
vm.swappiness = 60
```
3

sysctl -a | grep vm.swappiness

marousan · 2009-12-11 10:33:35 4
List all TCP opened ports on localhost in LISTEN mode

Alternative of OJM snippet : This one show the IP too, where ports bind. It's very important, because if there's only 127.0.0.1 instead of 0.0.0.0, connections from internet are rejected.
This is sample output - yours may be different.
3

netstat -nptl

sputnick · 2009-12-11 10:23:43 4
Analyse compressed Apache access logs for the most commonly requested pages
This is sample output - yours may be different.
4

zcat access_log.*.gz | awk '{print $7}' | sort | uniq -c | sort -n | tail -n 20

tkb · 2009-12-11 09:36:30 4
list all opened ports on host
This is sample output - yours may be different.
3

sudo lsof -P -i -n -sTCP:LISTEN

OJM · 2009-12-11 07:16:54 3
Send a local file via email

Another way of sending an attachment. -s : subject file : file to be sent
This is sample output - yours may be different.
4

mpack -s "Backup: $file" "$file" email@id.com

sentinel · 2009-12-11 04:03:06 3
See non printable caracters like tabulations, CRLF, LF line terminators ( colored )

For fancier and cleaner output, try the following snippet : showendlines(){ while read i; do od --address-radix=n --width=$(wc -c <<< "$i") -c <<< "$i" | perl -pe 's/.\K\s{2,3}//g'; done < $1 | grep --color '\\.'; } Now you can run that with : showendlines <FILE> Thanks to prince_jammys to "debug" my English ;)
This is sample output - yours may be different.
7

od -c <FILE> | grep --color '\\.'

sputnick · 2009-12-11 02:15:48 9
Send a local file via email

Send it the easy way, with MIME and everything handled for you by an app that knows best.
This is sample output - yours may be different.
4

mutt your@email_address.com -s "Message Subject Here" -a attachment.jpg </dev/null

linuxrawkstar · 2009-12-10 22:49:38 5
list all opened ports on host
This is sample output - yours may be different.
4

nmap -p 1-65535 --open localhost

solarislackware · 2009-12-10 20:03:37 3
Send a local file via email

on this way we can define the body too
This is sample output - yours may be different.
0

{ echo -e "$body"; uuencode "$outfile" "$outfile"; } | mail -s "$subject" "$destaddr" ;

glaudiston · 2009-12-10 18:08:59 4
prints line numbers

There's too many options to number, My curiosity has forced me to make it using only sed. Maybe useful... or not... :-S
This is sample output - yours may be different.
-1

sed '/./=' infile | sed '/^/N; s/\n/ /'

glaudiston · 2009-12-10 16:24:56 6
List the size (in human readable form) of all sub folders from the current location
This is sample output - yours may be different.
7

du -sh */

guxtavo · 2009-12-10 16:19:15 6
List the size (in human readable form) of all sub folders from the current location
This is sample output - yours may be different.
-4

ls | xargs du -sh

jyro · 2009-12-10 15:58:05 3
extract plain text from MS Word docx files

Tested on MacOS X
This is sample output - yours may be different.
5

unzip -p some.docx word/document.xml | sed -e 's/<[^>]\{1,\}>//g; s/[^[:print:]]\{1,\}//g'

putnamhill · 2009-12-10 15:13:33 12
Find jpeg images and copy them to a central location

Use if you have pictures all over the place and you want to copy them to a central location Synopsis: Find jpg files translate all file names to lowercase backup existing, don't overwrite, preserve mode ownership and timestamps copy to a central location
This is sample output - yours may be different.
4

find . -iname "*.jpg" -print0 | tr '[A-Z]' '[a-z]' | xargs -0 cp --backup=numbered -dp -u --target-directory {location} &

oracular · 2009-12-10 08:47:04 5
show your locale language keyboard setting

Show Sample Output
This is sample output - yours may be different.
```
gnu@robby:~$ locale | grep LANG=
LANG=fr_BE.UTF-8
```
-1

locale | grep LANG=

eastwind · 2009-12-10 07:24:01 5
Format a flooppy with windows compatible disk

The 1440 is the number of bytes, and the A: specifies the floppy drive.
This is sample output - yours may be different.
-1

mformat -f 1440 A:

eastwind · 2009-12-10 06:51:20 3
mount a msdos formated floppy disk

-t option tells the system to look for a msdos filesystem The /dev/fd0 is your floppy drive ( This may be different for you check /dev folder to confirm) /mnt/floppy is the point where you want to mount the device to
This is sample output - yours may be different.
-2

mount -t msdos /dev/fd0 /mnt/floppy

eastwind · 2009-12-10 06:46:53 7
convert wmv into xvid avi format
This is sample output - yours may be different.
1

mencoder -ovc xvid -oac mp3lame -srate 44100 -af lavcresample=44100 -xvidencopts fixed_quant=4 Foo.wmv -o Bar.avi

eastwind · 2009-12-10 06:46:11 3
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list folders containing less than 2 MB of data

Just shortened the awk a bit and removed sed. Edit: I'm assuming there are no spaces in the path. To support white space in pathname try: $ awk '($1 < 2048) {sub(/^[0-9]+[ \t]+/,""); print $0}'

Disable graphical login on Solaris

With a full installation of Solaris 10, the graphical login and desktop will start by default. This command will disable that feature. To enable it again use: /usr/dt/bin/dtconfig -e

Prevent non-root users from logging in

Also with optional message: $ echo "no login for you" > /etc/nologin (This doesn't affect your current X session - you're already logged in!)

find the longest command in your history

aptbackup restore

Use when aptbackup will not start or you just want to see what's going on.

Format partition with ext4 but without a journal

For slow flash memory (cheap thumb drive), ext4 is the fastest stable file system for all use cases with no relevant exception: http://www.linuxplanet.com/linuxplanet/tutorials/7208/1 Since we can usually dispense with the benefits of a journal for this type of storage, this is a way to achieve the least awful I/O-speed. Disabling the journal for an existing ext4 partition can be achieved using $ tune2fs -O ^has_journal /dev/sdXN Note that it is often recommended to format removable flash media with ext2, due to the lack of a journal. ext4 has many advantages over ext2 even without the journal, with much better speed as one of the consequences. So the only usecase for ext2 would be compatibility with very old software.

Decrypt exported android wallet keys for import into desktop client (LTC,FTC,BTC)

Quickly generate an MD5 hash for a text string using OpenSSL

Thanks to OpenSSL, you can quickly and easily generate MD5 hashes for your passwords. Alternative (thanks to linuxrawkstar and atoponce): $ echo -n 'text to be encrypted' | md5sum - Note that the above method does not utlise OpenSSL.

Multiline Search/Replace with Perl

from http://stackoverflow.com/questions/1030787/multiline-search-replace-with-perl added greedy trick in wildcard match (.*?) from http://www.troubleshooters.com/codecorn/littperl/perlreg.htm#Greedy

Scroll up (or Down (PgDn)) in any terminal session (except KDE)

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