Code & Commands Snippets
Here's a collection of useful code and commands i've picked up over the years, use at your own risk.
Apple iPhone
\var\root\Library\Notes\notes.db ...location of notes
C# Guid
Create a Guid (globally unique identifier)
string strGuid = Guid.NewGuid().ToString();
CSS
Class
<div class="myclass"></div>
.myclass { .... }
ID
<div id="myid"></div>
#myid { .... }
Firefox
CTRL+SHIFT+DEL = clear private data outside dialog
GIT Distributed Version Control
sudo aptitude install git-core
git init ...init repository
git add . ...add everything in dir to repository
git commit -a -m 'update' ...add + commit changes
git status ...show repository status
git checkout [path] ...checkout remote repository
git add [file] ...add file
git rm [file] ...remove file
git mv [file] ...move file
JavaScript
generate random number...
var randomnumber=Math.floor(Math.random()*11)
convert integer to string...
mys = myi + '';
convert object to string...
myi = Math.floor(myo);
href links...
<a href="javascript:void(0);" onclick="dosomething();" />
to access a javascript object from outside the iframe...
top.[my js object]
onclick="top.myobj.close();"
check if form element exists...
function testIsValidObject(objToTest) {
if (objToTest == null || objToTest == undefined) {
return false;
}
return true;
}
get value of selected list item...
$('myListBox').options[$('myListBox').options.selectedIndex].value
get text name of selected list item...
$('myListBox').options[$('myListBox').options.selectedIndex].value
JavaScript - Prototype
attach function to load event of page
Event.observe(window, 'load', myfunc);
or attach code to run once page has fully loaded (if you've got one Event.observe-on-load already setup, this will be appended to that one, so one doesn't overwrite the other)...
Event.observe(window, "load", function () {
...code...
};
alternatively, try Dexagogo's FastInit library,
...more functions,
- parseFloat syntax: parseFloat('string')
- parseInt syntax: parseInt( 'string' [, base] )
JAVA
compile java file to .class binaries
JAVAC [source.java]
run java program
JAVA [source -minus .java extension]
IIS
IISRESET ...restart iis service (run as administrator)
Linux
who ..users logged in and what they're doing
users ..users logged in
last ..users who have logged in / out + when last rebooted
lastlog ..does the same but lists as log
whoami ..who you're logged in as
sudo passwd [user] ..change users password
nano [file] ..nice text editor
gedit . ..open current dir in gnome editor (note the . )
cat /proc/cpuinfo ..show cpu info
free -tm ..shows memory free in mb
top ..memory usage
uname -options ..show o/s info
dmesg ..debug info
chown [user] file/folder ..change file/folder ownership
which [program] ..find location of program
sudo aptitude update
sudo aptitude safe-upgrade
sudo aptitude clean
sudo aptitude install [package]
sudo aptitude remove [package]
crontab -e
..start task on reboot without email reporting
@reboot (sh /startup.sh) > /dev/null 2>&1
poweroff ..shutdown machine
shutdown -r now ..reboot machine
rm -rf [dir] ...remove directory recursively
ls -a ..show files / dirs inc. hidden files
ls -l ..show file / dir permissions & sizes
ssh-keygen ..generate rsa key
ssh-keygen -d ..generate dsa key
ssh-keygen -f mykey ..generate named rsa key
chmod -R a+rw public ..make [public] public recursively
lspci | grep VGA ..show video hardware
Tip: if your copying files from one server to another wondering why the target server doesn't retain your file permissions; make sure your target server has the same user account as your source server.
adduser [username]
Security Enhanced Linux - SELinux
Linux add user to SUDOers List
Be as root, then edit the suoders file
su root
nano /etc/sudoers
Now add & save...
mynewsudoer ALL=(ALL) ALL
Logout, login and you're done.
Linux Frozen Restart
Hold down ALT + SysRq, then type REISUB, after which you machine will shutdown gracefully from a total lockup, quaintly remembered as 'Raising Elephants Is So Utterly Boring'.
Linux Screen Resolution Fix
Grabbed this a while back, not completely sure on the 100% ness, but may help you out re-testing your hardware,
//backup xorg config
sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf_backup
//stop x server
sudo /etc/init.d/gdm stop
//logout to non-graphical interface
Ctrl+ Alt+ F1
//login
//reconfigure xorg
sudo dpkg-reconfigure -phigh xserver-xorg
//restart xorg
sudo /etc/init.d/gdm start
Linux SCP
Securely copy *.gz files from server to local Documents directory,
sudo scp joe@mybox.com:/home/joe/*.gz ~/Documents
Or with an ssh identity file,
sudo scp -i ~/.ssh/mybox.pub joe@mybox.com:/home/joe/*.gz ~/Documents
Microsoft .NET
File upload settings in WEB.CONFIG
By default, ASP.NET permits only files that are 4,096 kilobytes (KB) (or 4 megabytes [MB]) or less to be uploaded to the Web server. To upload larger files, you must change the maxRequestLength parameter of the
< httpRuntime
executionTimeout="90"
maxRequestLength="4096"
useFullyQualifiedRedirectUrl="false"
minFreeThreads="8"
minLocalRequestFreeThreads="4"
appRequestQueueLimit="100"
/>
MySQL 5
MySQL and MySqlDump paths
these are usually located in /usr/bin/mysqldump and /usr/bin/mysql
CocoaMySQL Config
host = localhost
user = root
password = blank
NGINX Config Files
Rails - Console
script/console ...open RoR interactive console
script/console production ...load in production mode
reload! ...reload classes, etc.
quit ...quit console (or try 'exit')
Rails - RAKE
rake db:create ..create database
rake db:drop ..drop database
rake db:sessions:clear ..empty sessions table
rake db:migrate ..run db migrations
rake db:migrate VERSION=<version to roll back to> ..rollback db
rake rails:update:javascripts ..update javascript libraries
rake routes ...list available routes in application
Rails - no such file to load -- sqlite3/database
/usr/local/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.2.2]$ sudo find . -perm 0662 -exec chmod 664 {} \;
...more here
TrueCrypt
sudo truecrypt arc ...mount archive
sudo truecrypt arc -d ...dismount archive
UltraEdit
Line breaks with CRLF
- find: ><
- replace: >^p<
SQL Server
Shrink TempDB, No Mercy
BACKUP LOG tempdb WITH TRUNCATE_ONLY
DBCC SHRINKDATABASE(tempdb,TRUNCATEONLY)
SQL 2005 User Account Security
In SQL 2005 onwards all user accounts get the ability to force users to change their passwords on login, along with expiration times. So if you're logging in via ODBC and get the message 'The Password of the account must be changed' its because 'must change' is flagged for the login account. To change this, open Management Studio / Security / Logins and select the login account, double-click and untick CHECK_POLICY and CHECK EXPIRATION. Alternatively delete the user account and re-create it but this time making sure MUST CHANGE and the two others are un-ticked.
Ruby on Rails
- Migrations Cheat Sheet
- Acts_as_Authenticated
- RailsCasts - PodCast
-
Rails [app] ...creates initial ruby application files and creates [app] directory they will reside under
TextMate
Mate [dir]
Mate ../mydir <= opens directory in textmate
Tube (london)
get status updates, send text to 60835 with...
Tube district
to get status updates for the district line, change [district] to the line you use.
VI
Emulators,
- Vim ...vi clone
- ViEmu ...Vi/vim emulation for Visual Studio, Word, Outlook and SQL Server
- Vimperator ...Vimperator is a free browser add-on for Firefox, which makes it look and behave like the Vim text editor
Visual Studio
Toggle whitespace
ctrl + r
ctrl + w
Win / Linux Command-Line
PING -t [server] ..ping address infinitely
TRACERT 192.001.002.002* ..trace path across net
DIG [domain name] ..domain info (mac/linux)
CLS ..clear screen (win)
NSLOOKUP [domain name] ..domain info (win)
IPCONFIG /FLUSHDNS ..flush local dns cache
note: for DIG, you'll need the BIND9 & DNSUTILS package,
sudo aptitude install bind9 dnsutils
Windows Hosts File
Located in...
c:/windows/system32/drivers/etc/
Open the file hosts with notepad to edit it (open as Administrator in Windows Vista to change it).
Window Vista Explorer View Settings
This is changed in Vista, to set how you want files to show, hidden files, extensions, etc.,
- open 'Computer'
- then click on the 'Organise' tab,
- then on the drop-down select 'Folder and Search Options'
- within the popup select the 'View' tab, from there you can set the view options.
