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diff directories, quick cut and paste to view the changes

We use this to quickly highlight differences and provide a quick way to cut and paste the command to view the files using the marvellous vimdiff Show Sample Output
This is sample output - yours may be different.
```
vimdiff dir1/filea dir2/filea
vimdiff dir1/fileb dir2/fileb
vimdiff dir1/filec dir2/filec
```
1

diff -q dir1/ dir2/ | grep differ | awk '{ print "vimdiff " $2 " " $4 }'

binaryslate · 2009-02-05 12:37:00 1
bulk dl files based on a pattern

-O switch creates local filename same as remote curl [][] -o #1#2 makes local files unique inserting sequence values into #x placeholders sequences can be alpha or numeric e.g [a-z] [1-25]
This is sample output - yours may be different.
4

curl -O http://hosted.met-art.com/generated_gallery/full/061606AnnaUkrainePasha/met-art-free-sample-00[00-19].jpg

kumara · 2009-02-05 12:35:07 2
list all file-types (case-insensitive extensions) including subdirectories
This is sample output - yours may be different.
-1

find /path/to/dir -type f |sed 's/^.*\///'|grep -o '\.[^.]*$'|sort -f|uniq -i

beila · 2009-02-05 12:34:44 1
while series of video and subtitles have unmatched file names, rename subtitles the same as video files.

Subtitles' file names contain S04E01, S04E02, ... S04E12 and end with ".smi". Videos' file names contain S04E01, S04E02, ... S04E12 and end with ".avi". You can change the patterns by changing `ls *S04E$jj*.smi` and `ls *S04E$jj*.avi` parts. You can change the number of starting and ending file by changing `seq -f "%02.0f" 1 12` part.
This is sample output - yours may be different.
-1

for jj in `seq -f "%02.0f" 1 12`; do rr=`ls *S04E$jj*.smi`; tt=`ls *S04E$jj*.avi`; mv "$rr" "${tt%.*}.smi"; done

beila · 2009-02-05 12:16:06 2
Replaces every ocurrences of 'old' for 'new' in all files specified

Replaces every ocurrence of 'old' for 'new' in all files specified. After the 'i' char you can put a '~' or whatever to create a backup file for each replaced with the name equal to the original plus character.
This is sample output - yours may be different.
-1

perl -i -pe "s/old/new/g" *

pandres · 2009-02-05 12:07:27 1
cycle through a 256 colour palette

just for fun
This is sample output - yours may be different.
14

yes "$(seq 232 255;seq 254 -1 233)" | while read i; do printf "\x1b[48;5;${i}m\n"; sleep .01; done

pixelbeat · 2009-02-05 12:01:37 2
Serve current directory tree at http://$HOSTNAME:8000/
This is sample output - yours may be different.
835

python -m SimpleHTTPServer

pixelbeat · 2009-02-05 11:57:43 25
Shows the largest files in your archives
This is sample output - yours may be different.
0

tar -tvjf backup.tar.bz2 | sort -nrk 3 | head

Sekenre · 2009-02-05 11:57:18 1
Remove invalid host keys from ~/.ssh/known_hosts

Useful if you have to tunnel ssh through a local port and it complains of the host key being different. Much easier than manually editing the file.
This is sample output - yours may be different.
9

ssh-keygen -R \[localhost\]:8022

Sekenre · 2009-02-05 11:48:09 1
find all processes named hunger and force kill, minus the grep itself and output to a file called fu.bar
This is sample output - yours may be different.
-4

ps -auwx|egrep hunger|grep -v grep| awk '{print "kill -9",$1}' > ~/fu.bar

lendellray · 2009-02-05 11:43:38 3
rgrep: recursive grep without .svn

Only excludes .svn from filenames. Show Sample Output
This is sample output - yours may be different.
```
[[email protected] ~/css]$ rgrep sprites
./template.php:require "css_sprites.php";
./template.php: $abs_path.'/sprites/',
./template.php: 'sprites.css',
./template.php:include 'sprites.css';
```
2

alias rgrep="find . $ ! -name .svn -o -prune $ -type f -print0 | xargs -0 grep"

nf · 2009-02-05 11:23:23 7
Get the 10 biggest files/folders for the current direcotry
This is sample output - yours may be different.
48

du -s * | sort -n | tail

bambambazooka · 2009-02-05 11:18:43 4
Start urxvt and do whatever is needed to open the screen session named "main"

Open a terminal (urxvt in this case) to connect to a screen session (named "main") and create the screen session if necessary.
This is sample output - yours may be different.
0

screen -ls | grep main && urxvt -name screen -e screen -x main || urxvt -name screen -e screen -R -S main

trey · 2009-02-05 10:51:31 1
SSH to a machine's internet address if it is not present on your local network

Ping machine once, waiting 1 second for response until failing. Upon fail, ssh globally, otherwise ssh locally.
This is sample output - yours may be different.
1

ping localip -c 1 -W 1 &> /dev/null && ssh localip || ssh globalip

trey · 2009-02-05 10:40:26 2
search the manual page names and descriptions
This is sample output - yours may be different.
2

apropos somekeyword

chrisdrew · 2009-02-05 10:29:15 2
locate bin, src, and man file for a command
This is sample output - yours may be different.
4

whereis somecommand

chrisdrew · 2009-02-05 10:29:10 1
locate a command

Returns the pathnames of the files which would be executed in the current environment had its arguments been given as a command.
This is sample output - yours may be different.
-1

which somecommand

chrisdrew · 2009-02-05 10:29:04 1
Search through files, ignoring .svn

Variant of find grep that ignores files with .svn in the name. Useful for searching through a local repository of source code.
This is sample output - yours may be different.
-3

find . -type f -print0 | grep -vzZ '.svn' | xargs -0 grep --color -nEHi "SEARCHTERM"

troelskn · 2009-02-05 10:27:15 4
cd canonical (resolve any symlinks)
This is sample output - yours may be different.
-2

alias cdc='cd `pwd -P`'

adavies42 · 2009-02-05 10:15:11 2
ring the bell
This is sample output - yours may be different.
2

alias beep='echo -en "\007"'

adavies42 · 2009-02-05 10:14:24 4
get a directory from one machine to another using tar and ssh
This is sample output - yours may be different.
2

ssh somemachine "cd some dir; tar zcpf - somedirname" |tar zxpf -

mischamolhoek · 2009-02-05 09:10:56 5
A nice command for summarising repeated information
This is sample output - yours may be different.
3

alias counts=sort | uniq -c | sort -nr

porges · 2009-02-05 08:24:02 1
Rip audio from a video file.

Replace and accordingly.
This is sample output - yours may be different.
66

mplayer -ao pcm -vo null -vc dummy -dumpaudio -dumpfile <output-file> <input-file>

sykora · 2009-02-05 08:17:04 4
diff two unsorted files without creating temporary files

bash/ksh subshell redirection (as file descriptors) used as input to diff
This is sample output - yours may be different.
96

diff <(sort file1) <(sort file2)

systemj · 2009-02-04 22:20:13 1
Run a command only when load average is below a certain threshold

Good for one off jobs that you want to run at a quiet time. The default threshold is a load average of 0.8 but this can be set using atrun. Show Sample Output
This is sample output - yours may be different.
```
job 6 at 2009-02-04 19:03
```
42

echo "rm -rf /unwanted-but-large/folder" | batch

root · 2009-02-04 19:07:52 4
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Convert control codes to visible Unicode Control Pictures

Converts control codes and spaces (ASCII code ≤ 32) to visible Unicode Control Pictures, U+2400 ? U+2420. Skips \n characters, which is probably a good thing.

MySQL dump restore with progress bar and ETA

Display a progress bar while restoring a MySQL dump.

read a file line by line and perform some operation on each line

see sample output

Get all available packages on Ubuntu (or any distro that uses apt)

List open sockets protocol/address/port/state/PID/program name

Set laptop display brightness

Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

Find recursively, from current directory down, files and directories whose names contain single or multiple whitespaces and replace each such occurrence with a single underscore.

Note the g for global in the perl expression; without it, only the first occurrence in the name would be replaced.

add the result of a command into vi

':r!ls -l' results in listing the files in the current directory and paste it into vi

Emptying a text file in one shot

Within vi allow to empty a text file in one shot

Put uppercase letters in curly brackets in a BibTeX database

It is often recommended to enclose capital letters in a BibTeX file in braces, so the letters will not be transformed to lower case, when imported from LaTeX. This is an attempt to apply this rule to a BibTeX database file. DO NOT USE sed '...' input.bib > input.bib as it will empty the file! How it works: $ /^\s*[^@%]/ Apply the search-and-replace rule to lines that start (^) with zero or more white spaces (\s*), followed by any character ([...]) that is *NOT* a "@" or a "%" (^@%). $ s===g Search (s) for some stuff and replace by other stuff. Do that globally (g) for all matches in each processed line. $ $[A-Z][A-Z]*$$[^}A-Z]\|},$$ Matches at least one uppercase letter ([A-Z][A-Z]*) followed by a character that is EITHER not "}" and not a capital letter ([^}A-Z]) OR (|) it actually IS a "}", which is followed by "," at the end of the line ($). Putting regular expressions in escaped parentheses ($ and $, respectively) allows to dereference the matched string later. $ {\1}\2 Replace the matched string by "{", followed by part 1 of the matched string (\1), followed by "}", followed by the second part of the matched string (\2). I tried this with GNU sed, only, version 4.2.1.

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