bulk rename bash

for f in oldprefix*; do mv "$f" "${f/oldprefix/newprefix}"; done

simple python mail script

got it from here: http://www.eskimo.com/~jet/python/examples/mail/smtp_email.html

import smtplib
import email.Message

def mail(serverURL=None, sender='', to='', subject='', text=''):
message = email.Message.Message()
message["To"] = to
message["From"] = sender
message["Subject"] = subject
message.set_payload(text)
mailServer = smtplib.SMTP(serverURL)
mailServer.sendmail(sender, to, message.as_string())
mailServer.quit()

Leopard samba client

Some Mac leopard clients ignore the force create mode settings from your smb.conf which work with most other clients.

If you want stuff to work with those clients try this (user+group can read, write all, others cannot do anything):


create mask = 0660
force create mode = 0660
security mask = 0000
force security mode = 0660

directory mask = 0770
force directory mode = 0770
directory security mask = 0000
force directory security mode = 0770


http://discussions.apple.com/message.jspa?messageID=5904901

php4-cgi with php5 apache2 module

Ran in a situation where I had to run php4 and 5 on the same box (but different folders).

On debian you'll have to install php4-cgi and enable apache mods (suexec, ssl, actions, mime) following VritualHost config worked for me:

<VirtualHost *:80 >

ServerAdmin bart@dlma.nl
DocumentRoot /var/www/tutos/HTML/
ServerName tutos.dlma.nl


ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
<Directory /var/www/tutos/HTML>
AllowOverride All
Options -Indexes

AddHandler php-script .php
Action php-script /cgi-bin/php4


</Directory>

</VirtualHost>

switch user svn+ssh

If you want to change the username of your svn+ssh working copy (and the username is in the url i.e. svn+ssh://username@host.nl/repos ) the '--username' will not work. Instead you'll have to change the URL with the 'switch --relocate' command as follows:

$svn switch --relocate svn+ssh://username@host.nl/repos svn+ssh://newusername@host.nl/repos

list scsi devices linux

The 'lsscsi' command lists the scsi drives attached to your system.

ubuntu (aptitude install lsscsi)

Also checkout the file
/proc/scsi/scsi


and the command hwinfo --scsi

trac Integrety Error

If your trac starts giving you Intgrety Errors try to do a:

trac-admin /your/trac/path resync

loop throught files with bash

For-in loops don't work well when you have filenames with spaces in them

#!/bin/bash
ls *.pdf | while read i; do
j=`echo $i | sed s/\.pdf/\.swf/`
pdf2swf "$i" -o "$j"
done

ssh X forwarding on your server

If you have an ubuntu/debian server running and want to run X apps through ssh -X you should "apt-get install xauth" for this to work.

tortoise SVN

In some cases tortoise svn (windows svn client) can't do checkouts of your repository and the following message is displayed:

"Not authorized to open root of edit operation"

Adding the following line to your svnserve.conf solved the problem for me:

"anon-access=none"

Hollandse hitmachines

Voor al uw nederlandse artiesten en hollandse hitmachines

http://www.watzitjenoutekijken.nl

convert int to a separate bytes

def intToBytes(self,n, bytecount):
""" returns the binary of integer n, using count number of digits """
str = ""

i=bytecount-1
#8 bit mask
mask = ~(sys.maxint^(pow(2,8)-1))
while i >= 0:
str = str + chr((n>>(i*8))&mask)
i-=1

return str

convert bytes to an integer in python

ran into a situation where i had to convert some bytes to an integer value in python. This func does the trick. The mask is only used to have a counter of the same length counting backwards (hence the negation).
def bytesToInt ( self, bytes ):
""" convert certain amount of bytes to an integer """
size=0
i=0

mask = sys.maxint&(len(bytes)-1)
while i < len(bytes):
size = size|ord(bytes[i])<<((~i)&mask)*8
i+=1

return size

rolling back with svn

Say you want to rollback (parts of) your svn repository to a certain revision. This can be done with svn merge.

it works like this:

$ svn merge -r 1481:1373 svn+ssh://your.host.com/srv/repos/subdir

where the first number is the current revision and the second number is the revision you want to 'rollback' to.

A list with changes should appear (also use svn status for this). If you think you're done do a commit and the changes will be done on the repository.

tcpdump

for ftp traffic
tcpdump -A -i eth0 tcp port 21

comes in handy when you want to see what passwords are used.

WEP cracking with aircrack-ng

Open three terminals

terminal 1:
$airodump-ng -c 4 --bssid FA:KE:FA:KE:FA:KE -i -w jah eth1

This is an exmaple that dumps only weak iv's (channel 4) interface eth1 from the AP with this particular BSSID

You can also do a scan for WEP AP's first by running "airodump-ng eth1" without any further args.

If you're seeing some traffic between the AP and the client (use bssid for reference). use aireplay like this (in the second terminal):

$aireplay-ng -3 -b FA:KE:FA:KE:FA:KE -h FA:KE:FA:KE:FA:KE eth1

the three means you're doing ARP. The -b is the AP. The -h is the client.

If you leave this running for some time you can use the third terminal to run aircrack on the .ivs file airodump-ng created. It'll try to crack the key every now and then so you can leave it running.

filenames beginning with a - (dash)

If you want to (for example) cd to a file starting with a dash (some mac users tend to use weird filenames like "-folder" ). do

$cd ./-folder

removing files matching a certain pattern

from the xargs man:

delete all .svn folder

$find /somedir -name .svn -print0 | xargs -0 /bin/rm -rf

xargs comes in handy when handling great amounts of files.

replacing text in a bunch of files matching a certain pattern

Replace comes with mysql. It's a handy tool for sed/awk n00bs. This one I used to change some static paths while excluding all .svn folders and logfiles.

~$ replace '/var/www/mydir' '/var/www/newdir/' -- `grep --exclude-dir=.svn --exclude=*.log -clr "/var/www/mydir" ./*`

Of course there are other/better ways to accomplish this, look at this
http://www.brunolinux.com/02-The_Terminal/Find_and%20Replace_with_Sed.html

ejecting a cd from a mac (running OS X)

Before rebooting try in terminal:

$drutil eject

page up / page down bash

add these lines to your /etc/inputrc to search backwards through history. It searches on the string already typef

"\e[5~": history-search-backward
"\e[6~": history-search-forward

example post commit hook

Sample script for a conditional post-commit hook in bash. This post-commit hook updates a local copy (www directory) to the latest revision when files are changed within a certain directory.

#!/bin/bash
umask 0002

REPOS=$1
REV=$2
MATCH=`/usr/bin/svnlook -r $REV dirs-changed $REPOS | /bin/grep -c "just a string"`

if [ $MATCH -gt 0 ];then
/usr/bin/svn update /var/www/projects/mysite
fi

Never create a PagesController in Cake

While fiddling with cake. I got some weird error in my PagesController:

You are seeing this error because the action display is not defined in controller PagesController"

Whatever I did, it kept asking for a default view. After some searching it seems the PagesController is reserved for cake itself.


Reference: http://logs.cakephp.nu/cakephp/chat.log.2007-06-26