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Hiding and Show files on Mac OS X

These commands will mark a file as hidden or visible to Mac OS X Finder. Notice the capitol V vs the lowercase v. This will also work for directories. setfile -a V foo.bar; // This marks the file invisible setfile -a v foo.bar; // This marks the file visible I have also found that adding the following aliases are helpful: alias hide='setfile -a V' alias show='setfile -a v'
This is sample output - yours may be different.
1

setfile -a V foo.bar; setfile -a v foo.bar;

JakeCarter · 2009-08-12 17:16:03 12
grep certain file types recursively
This is sample output - yours may be different.
4

find . -name "*.[ch]" | xargs grep "TODO"

freestyler · 2009-08-12 16:53:01 5
Generate random IP addresses

It never ends Show Sample Output
This is sample output - yours may be different.
```
136.159.200.131
188.52.81.164  
67.192.148.226 
192.136.218.176
93.242.113.87  
112.209.160.94 
(... ad infinitum ...)
```
1

nmap -n -iR 0 -sL | cut -d" " -f 2

kovan · 2009-08-12 16:49:55 8
use vim to get colorful diff output

:q to quit
This is sample output - yours may be different.
23

svn diff | view -

freestyler · 2009-08-12 16:41:31 17
List path of binaries

( IFS=:; for i in $PATH; do echo $i; done; ) echo $PATH|sed -e 's/:/\n/g' # but the tr one is even better of course echo $PATH|xargs -d: -i echo {} # but this comes up with an extra blank line; can't figure out why and don't have the time :( echo $PATH|cut -d: --output-delimiter=' ' -f1-99 # note -- you have to hit ENTER after the first QUOTE, then type the second one. Sneaky, huh? echo $PATH | perl -l -0x3a -pe 1 # same darn extra new line; again no time to investigate echo $PATH|perl -pe 's/:/\n/g' # too obvious; clearly I'm running out of ideas :-)
This is sample output - yours may be different.
-17

not necessarily better, but many...!

sitaramcUnused · 2009-08-12 11:03:26 4
Get a regular updated list of zombies

to omit "grep -v", put some brackets around a single character
This is sample output - yours may be different.
6

watch "ps auxw | grep [d]efunct"

alvinx · 2009-08-12 08:11:16 4
List path of binaries
This is sample output - yours may be different.
-2

echo $PATH|awk -F: ' { for (i=1; i <= NF; i++) print $i }'

nitins · 2009-08-12 07:56:56 4
Change Windows Domain password from Linux

If you use Linux in a Windows domain and there are N days to expiry, this is how you can change it without resorting to a windows machine.
This is sample output - yours may be different.
7

smbpasswd -r <domain-server> -U <user name>

greppo · 2009-08-12 07:46:48 11
Download file with multiple simultaneous connections

`aria2c` (from the aria2 project) allows. Change -s 4 to an arbitrary number of segments to control the number of concurrent connections. It is also possible to provide multiple URLs to the same content (potentially over multiple protocols) to download the file concurrently from multiple hosts.
This is sample output - yours may be different.
8

aria2c -s 4 http://my/url

jrk · 2009-08-11 22:34:00 11
Preview of a picture in a terminal

This command allows you to see a preview of a picture via the terminal. It can be usefull when you are ssh'ing your server without X-forwarding. To have en example of the output you can get with this command see http://www.vimeo.com/3721117 Download at http://inouire.net/image-couleur.html Sources here: http://inouire.net/archives/image-couleur_source.tar.gz
This is sample output - yours may be different.
2

img test.jpg

Inouire · 2009-08-11 22:09:21 10
Get info on RAM Slots and Max RAM.
This is sample output - yours may be different.
2

dmidecode 2.9 | grep "Maximum Capacity"; dmidecode -t 17 | grep Size

lunarblu · 2009-08-11 21:23:29 4
On Mac OS X, runs System Profiler Report and e-mails it to specified address.

Replace "user@domain.com" with the target e-mail address. Thanks to alediaz for "$HOSTNAME" which is very useful when running the command with Apple Remote Desktop to multiple machines simultaneously.
This is sample output - yours may be different.
4

system_profiler | mail -s "$HOSTNAME System Profiler Report" user@domain.com

monkeymac · 2009-08-11 20:16:37 7
Move all but the newest 100 emails to a gzipped archive
This is sample output - yours may be different.
3

find $MAILDIR/ -type f -printf '%T@ %p\n' | sort --reverse | sed -e '{ 1,100d; s/[0-9]*\.[0-9]* $.*$/\1/g }' | xargs -i sh -c "cat {}&&rm -f {}" | gzip -c >>ARCHIVE.gz

maergil · 2009-08-11 20:12:15 3
ps -A

list all the processes Show Sample Output
This is sample output - yours may be different.
```
list all the process
```
-13

ps -A

xraj · 2009-08-11 16:52:59 7
Sum columns from CSV column $COL

More of the same but with more elaborate perl-fu :-)
This is sample output - yours may be different.
1

perl -F',' -ane '$a += $F[3]; END { print $a }' test.csv

coffeeaddict_nl · 2009-08-11 15:08:58 3
Testing php configuration
This is sample output - yours may be different.
6

php -i

elzapp · 2009-08-11 14:17:13 27
Testing php configuration
This is sample output - yours may be different.
1

php -r "phpinfo;"

s0x · 2009-08-11 13:39:16 4
Check if a domain is available and get the answer in just one line

Returns nothing if the domain exists and 'No match for domain.com' otherwise.
This is sample output - yours may be different.
7

whois domainnametocheck.com | grep match

Timothee · 2009-08-11 13:33:25 17
Get a regular updated list of zombies

Shows all those processes; useful when building some massively forking script that could lead to zombies when you don't have your waitpid()'s done just right.
This is sample output - yours may be different.
5

watch "ps auxw | grep 'defunct' | grep -v 'grep' | grep -v 'watch'"

coffeeaddict_nl · 2009-08-11 12:22:13 4
Sum columns from CSV column $COL
This is sample output - yours may be different.
8

awk -F ',' '{ x = x + $4 } END { print x }' test.csv

coffeeaddict_nl · 2009-08-11 12:10:33 11
Testing php configuration

Run the function phpinfo() on the shell
This is sample output - yours may be different.
2

php -r phpinfo();

amaymon · 2009-08-11 07:00:51 4
Testing php configuration

http://localhost/test.php
This is sample output - yours may be different.
-3

echo "<?php phpinfo(); ?>" >> /srv/www/htdocs/test.php

userevolution · 2009-08-11 05:56:25 13
Picture Renamer
This is sample output - yours may be different.
1

exiv2 rename *.jpg

unixmonkey5069 · 2009-08-10 22:11:19 17
Recursively Find Images, Convert to JPEGS and Delete

Simple command to convert a large number of images into jpeg-format. Will delete originals after conversion.
This is sample output - yours may be different.
4

find . -name '*'.tiff -exec bash -c "mogrify -format jpg -quality 85 -resize 75% {} && rm {}" \;

erlebnishengst · 2009-08-10 18:27:10 6
Count the number of pages of all PDFs in current directory and all subdirs, recursively
This is sample output - yours may be different.
3

find . -name \*.pdf -exec pdfinfo {} \; | grep Pages | sed -e "s/Pages:\s*//g" | awk '{ sum += $1;} END { print sum; }'

unixmonkey3987 · 2009-08-10 16:28:24 45
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Add line number count as C-style comments

I often find the need to number enumerations and other lists when programming. With this command, create a new file called 'inputfile' with the text you want to number. Paste the contents of 'outputfile' back into your source file and fix the tabbing if necessary. You can also change this to output hex numbering by changing the "%02d" to "%02x". If you need to start at 0 replace "NR" with "NR-1". I adapted this from http://osxdaily.com/2010/05/20/easily-add-line-numbers-to-a-text-file/.

Create a backup of the file.

It will create a backup of the filename. The advantage is that if you list the folder the backups will be sorted by date. The command works on any unix in bash.

DVD ripping with ffmpeg

To rip DVD movie to ogg format using ffmpeg, follow these steps. 1) find the vob files on the mounted video DVD in VIDEO_TS that stores the movie itself. There would be a few other VOB files that stores splash screen or special features, the vob files for the movie itself can be identified by its superior size. You can verify these vob files by playing them directly with a player (e.g. mplayer) 2) concatenate all such vob files, pipe to ffmpeg 3) calculate the video size and crop size. The ogg video size must be multiple of 16 on both width and height, this is inherit limitation of theora codec. In my case I took 512x384. The -vcodec parameter is necessary because ffmpeg doesn't support theora by itself. -acodec is necessary otherwise ffmpeg uses flac by default.

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

validate xml in a shell script using xmllint

Extract rpm package name, version and release using some fancy sed regex

This command could seem pretty pointless especially when you can get the same result more easily using the rpm builtin queryformat, like: $ rpm -qa --qf "%{NAME} %{VERSION} %{RELEASE}.%{ARCH}\n" | sort | column -t but nonetheless I've learned that sometimes it can be quite interesting trying to explore alternative ways to accomplish the same task (as Perl folks like to say: There's more than one way to do it!)

Port Knocking!

Knock on ports to open a port to a service (ssh for example) and knock again to close the port. You have to install knockd. See example config file below. [options] logfile = /var/log/knockd.log [openSSH] sequence = 3000,4000,5000 seq_timeout = 5 command = /sbin/iptables -A INPUT -i eth0 -s %IP% -p tcp --dport 22 -j ACCEPT tcpflags = syn [closeSSH] sequence = 5000,4000,3000 seq_timeout = 5 command = /sbin/iptables -D INPUT -i eth0 -s %IP% -p tcp --dport 22 -j ACCEPT tcpflags = syn

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

sort through source to find most common authors

Get version of loaded kernel module

Returns the version of the kernel module specified as "MODULENAME", when available.

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