Scripting Languages I Node. Python, PHP, Rubya side by side reference sheetsheet one version grammar and execution variables and expressions arithmetic and logic strings regexes dates and time arrays dictionaries functions execution control exceptions threadssheet two streams asynchronous events files file formats directories processes and environment option parsing libraries and namespaces objects inheritance and polymorphism reflection net and web gui databases unit tests logging debuggingversionnode. V python version php version ruby versionimplicit prologue  npm install lodashconst requirelodash import os, re, sys sudo apt install php mbstringnonegrammar and executionnode. UTF 8. Python 3 source is UTF 8 by default Python 2 source is US ASCII coding us ascii none. Ruby 2. 0 source is UTF 8 by default coding utf 8 end of line comment  comment comment comment comment commentmultiple line comment lineanother line use triple quote string literal comment lineanother linecomment lineanother line begincomment lineanother lineendvariables and expressionsnode. SA-stuff/AVEuX-alt.png' alt='Index Of Parent Directory Windows Iso S' title='Index Of Parent Directory Windows Iso S' />ES6 let x 1 let y 2, z 3 older alternative to let var x 1 let local scope is nearest enclosing block var local scope is nearest function body. File. Var n nonenonenoneglobal variableglobal. Global global. ES6const PI 3. PI 3. 1. 4definePI, 3. PI 3. 1. 4 warning if capitalized identifier is reassigned. PI 3. 1. 4assignment v 1 assignments can be chained but otherwise dont return values v 1v 1 v 1parallel assignment  new in ES6 let x, y, z 1, 2, 3 x, y, z 1, 2, 3 raises Value. Error x, y 1, 2, 3 raises Value. Error x, y, z 1, 2listx, y, z 1 ,2, 3 3 is discarded listx, y 1, 2, 3 z set to NULL listx, y, z 1, 2 x, y, z 1, 2, 3 3 is discarded x, y 1, 2, 3 z set to nil x, y, z 1, 2swap  new in ES6 x, y y, x x, y y, xlistx, y y, x x, y y, xcompound assignmentarithmetic, string, logical, bit none nonelt lt do not return values lt lt none. None. NULL case insensitivenilnull test v nullv is Noneisnullv Evaluates as undefined. FOSS-Cloud-iso-choosable.jpeg' alt='Index Of Parent Directory Windows Iso S' title='Index Of Parent Directory Windows Iso S' />UNIX For DOS Users. Aish Hatorah Rabbinical Program on this page. The following table shows a comparison between DOS COMMAND. COM and MSWindows NT CMD. EXE shell commands and the equivalent LinuxUnix or Bash. This is the old version, please see the new Sysprep a Windows 7 Machine Start to Finish V2. Note I highly recommend creating a boot or rescue disk before. While processing a request the server looks for the first existing configuration file from this list of names in every directory of the path to the document, if. In computing, directory service or name service maps the names of network resources to their respective network addresses. It is a shared information infrastructure. Windows-7.png' alt='Index Of Parent Directory Windows Iso Service' title='Index Of Parent Directory Windows Iso Service' />Use the triple equality operator to test for this value. Name. Error. Evaluates as NULLraises Name. Errorconditional expression x 0 True False. TRUE FALSE case insensitivetrue falsefalsehoods false null undefined 0 Na. NFalse None 0 0. 0 FALSE NULL 0 0. Math. min1, 2, 3Math. Math. min. applyMath, 1, 2, 3Math. Math, 1, 2, 3min1, 2, 3max1, 2, 3min1, 2, 3max1, 2, 3min1, 2, 3max1, 2, 3a 1, 2, 3minamaxa1, 2, 3. In Python 2, performs integer division. Math. floor2. 2 72. Returns Infinity, Na. N, or Infinity depending upon sign of dividend. There are literals for Infinity and Na. N. raises Zero. Division. Errorreturns FALSE with warningraises Zero. Division. Errorfloat division 2. Python 2 float2. Zero. Division. Errorreturns FALSE with warningreturns Infinity, Na. N, or Infinitypower Math. Math. sqrt2import mathmath. Mathsqrt2sqrt 1 Na. N raises Value. Error import mathmath. Install Oracle 8I On Windows 2008. Na. NMath. sqrt 1 raises Math Domain. Error unless require complex is in effect. Math. exp Math. log Math. Math. cos Math. tan Math. Math. acos Math. atan Math. Mathexp log sin cos tan asin acos atan atan. Math. PIMath. Eimport mathmath. MPI MEinclude Math. PI Efloat truncation none. Math. round3. 1Math. Math. ceil3. 1import mathintxintroundxmath. Math. abs 3absxabsxx. Bignumfloat overflow Infinityraises Overflow. Error. INFInfinityrational construction nonefrom fractions import Fractionx Fraction2. Math. floorMath. Math. Python 2. 0x. 2a. String7parse. Int6. Stringstr Python 2 unicode array of bytes string. Stringstring literal dont say nodont say nodont say nodont say nodont say no Python 2 and Python 3 uloremuipsumdont say nodont say nodont say nodont say nodont say nonewline in literal  backquote literals only first linesecond line Backslashes can be used to break long strings. Uhhhhhhhh. In Python 2, u and U only available in string literals with u prefixdouble quoted f n r t v xhh ooosingle quoted double quoted a b cx e f n r s t v xhh ooo uhhhh uhhhhhsingle quoted here document nonenoneword amet s lt lt lt EOFlorem ipsumdolor sit word. EOF word amets lt lt EOFlorem ipsumdolor sit wordEOFvariable interpolation let count 3 let item ball let s count items count 3item ballprintcount items. Python 3. 6 printfcount itemscount 3 item ball echo count itemsn count 3item ballputs count itemsexpression interpolation1 1 1 11 1. Python 3. 6 f1 1 1 1none1 1 1 1format string  None use string concatenation. Evaluates to 1. Fixed2lorem s d f ipsum, 1. Hello, World s Hello, s. World juxtaposition can be used to concatenate literals s. Hello, Worlds Hello, s. World s Hello, s. World juxtaposition can be used to concatenate literals s. Hello, Worldreplicate let hbar. Upper. CaseLOREM. Lower. Caselorem. LOREM. lowermbstrtoupperloremmbstrtolowerLOREM strtoupperstrtolower are ASCII onlylorem. LOREM. downcasecapitalizestring, words. ASCII only ucfirststrtolowerloremucwordsstrtolowerlorem ipsum Unicode title case mbconvertcaselorem ipsum, MBCASETITLElorem. Leftlorem. trim. Right lorem. Startlorem, 1. Endlorem, 1. STRPADLEFTstrpads, 1. STRPADBOTHlorem. Math. Math. PI 1. 00 1. Python 3. 6 fmath. MPI, 2include Math. PIPI. round2string to number 7 parse. Sample Program In Java Using Switch Case here. Int1. 2, 1. 07. Float. Int1. 2A Na. N parse. IntA7 int1. Value. Error int1. A raises Value. Error intA7 1. A 0 0 A7 1. A. toi 0 A. Type. Error. None, 1pregsplits, do re mi fa, 2do re mi fa. NULL, PREGSPLITDELIMCAPTUREdo re mi fa. Withfoofoobar. Withbarfoobar. Ofipsum raises Value. Error if not found do re re. Mac OS X Hints A community built collection of OS X hints. This is my takean update on lasvegas hint I found here awhile back for running OS updates without creating a user on a Mac. It is applicable to any system 1. This can be helpful if you have a Time Machine backup thats on a newer OS than your install media, or if youre sellingdonating your Mac as it saves the new user having to update things. First things first, wipe your drive and zero it if you dont trust the end user of this computer and reinstall your desired OS. Once your OS is installed, boot to your install media or the Recovery Partition if available. Open Terminal from the Utilities option in the menubar. In the new Terminal window, type the following. This will bring up the Password Reset utility. Click Macintosh HD or whatever your HDD is called. Youll notice the only user account thats available is root. Enter a password youd like to useremember, though it doesnt really matter as well be disabling root and removing this password later. Click save, close the password reset utility and go back to working in Terminal. Now youll want to enter the following command. VolumesMacintosh HDprivatevardb. Apple. Setup. Done. This will create the file on Macintosh HD that tells the computer it has completed the setup so youre able to skip the process and login with the root account we just enabled. Close Terminal and reboot the computer into the Macintosh HD. You should be greeted by the login screen with an option that says Other. Click Other, enter root as the username and the password you chose to login. Proceed with Software Updates and any optional software youd like to install, making sure to install for All Users if prompted. Also keep in mind that any preference changes you make will only apply to the root user, so theres no sense in wasting any time customizing the look, feel and general operation of the computer. After all software is installed, open up Terminal once more. Enter the following code. Apple. Setup. Done. This will remove the file we originally created and re enable the setup assistant to help create the newfirst user on the Mac. Next, open up Directory Utility. This can be found in Users Groups in System Preferences. Click Login Options, then click Join. Network Account Server. You should then see the option Open Directory Utility. Once in Directory Utility, click Edit in the menubar and then select Disable root user. As a note, this can be done while logged in as root. Close Directory Utility and restart the computer, booting back into to your install media or Recovery Partition. Open up Terminal one last time and enter. Once the Password Reset utility has appeared, click the root user once more. Instead of changing the password, however, simply click the Reset button to reset Home Folder ACLs. Reboot your Mac, confirm you see the Setup Assistant and youre ready to move onto restoring your backup or selling your computer I havent tested this one.