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  • Why should I use $[ EXPR ] instead of $(( EXPR ))?

    - by qdii
    On the paragraph explaining arithmetic expansion, Bash's user guide uncovers 2 different ways of evaluating an expression, the first one uses $((?EXPRESSION?)) and the second one uses $[?EXPRESSION?]. The two ways seem pretty similar as the only difference I have found is: $[?EXPRESSION?] will only calculate the result of EXPRESSION, and do no tests: Yet, I am intrigued because the same document recommends using $[?EXPRESSION?] rather than $((?EXPRESSION?)). Wherever possible, Bash users should try to use the syntax with square brackets: Why would you want that if less tests are being done?

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  • Store product data in session variable or access db every time?

    - by JakeTheSnake
    I have my database storing lots of information about products (year, name, release_date, volume, etc. etc.). I currently load all of the products once and store them in a session variable - right now there's only 8 products but the list will grow as time progresses. The reason why I did this was to (perhaps foolishly) save HDD reads every time the products page was accessed. Am I shooting myself in the foot by storing this information in the session?

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  • Provide credentials to process in a safe manner

    - by Erik Aigner
    On system startup I need to launch a process which requires credentials for other services (database etc.) to interact. I obviously don't want to store those on disk for security reasons. I'm trying to think of a way to provide those credentials to the process on launch - and on launch only. After that they should be only available to the process. Is this possible somehow? The bottom line is to make it as hard as possible for an intruder to get to those credentials.

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  • how to export VARs from a subshell to a parent shell?

    - by webwesen
    I have a Korn shell script #!/bin/ksh # set the right ENV case $INPUT in abc) export BIN=${ABC_BIN} ;; def) export BIN=${DEF_BIN} ;; *) export BIN=${BASE_BIN} ;; esac # exit 0 <- bad idea for sourcing the file now these VARs are export'ed only in a subshell, but I want them to be set in my parent shell as well, so when I am at the prompt those vars are still set correctly. I know about . .myscript.sh but is there a way to do it without 'sourcing'? as my users often forget to 'source'. EDIT1: removing the "exit 0" part - this was just me typing without thinking first EDIT2: to add more detail on why do i need this: my developers write code for (for simplicity sake) 2 apps : ABC & DEF. every app is run in production by separate users usrabc and usrdef, hence have setup their $BIN, $CFG, $ORA_HOME, whatever - specific to their apps. so ABC's $BIN = /opt/abc/bin # $ABC_BIN in the above script DEF's $BIN = /opt/def/bin # $DEF_BIN etc. now, on the dev box developers can develop both ABC and DEF at the same time under their own user account 'justin_case', and I make them source the file (above) so that they can switch their ENV var settings back and forth. ($BIN should point to $ABC_BIN at one time and then I need to switch to $BIN=$DEF_BIN) now, the script should also create new sandboxes for parallel development of the same app, etc. this makes me to do it interactively, asking for sandbox name, etc. /home/justin_case/sandbox_abc_beta2 /home/justin_case/sandbox_abc_r1 /home/justin_case/sandbox_def_r1 the other option i have considered is writing aliases and add them to every users' profile alias 'setup_env=. .myscript.sh' and run it with setup_env parameter1 ... parameterX this makes more sense to me now

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  • How do I reset my PYTHONPATH?

    - by Underyx
    Somehow my PYTHONPATH environment variable got emptied, and now I can't import some downloaded modules. I've tried running the following command to reinstall all Python packages, but it didn't set the variable back to its original value: dpkg-query -W -f '${package}\n' | grep python | xargs -I % sudo apt-get install % --reinstall How do I reinstall the packages so that this gets sorted out? The (Vagrant) box is running Ubuntu 12.04.

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  • Path erased in Debian

    - by Lyon83
    I'm trying to deploy a rails app in Debian, using Apache/Passenger. I was trying to fox a problem with some GEMs and in the process I put executed this in console: export PATH=/var/lib/gems/1.8/bin/:${vendor/cache} Now my path environmental variable is gone, or at least its content. My server is running under Debian 6. Is there a way to recover my path info? Or at least can someone point me where to find the file where that variable i s stored? Some help please. This is a BIG problem for me. Thanks in advance!

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  • Windows 7 - User-specific %PATH%

    - by MiffTheFox
    I'd like to set up a system for Windows 7 where each user has their own private directory in %PATH%. I tried setting %PATH% to %HOMEDRIVE%%HOMEPATH%\Bin;%SystemRoot%\System32;[...] but it doesn't seem to work. For those who don't realize what I'm trying to do, it's sort of like EXPORT PATH=~/bin would be on *nix. It can be on a user specific basis if need be (and that would actually be prefer to the machine-wide settings).

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  • Google Analytics custom variables and how are they recorded?

    - by mrtsherman
    I have been asked to add GA custom variable tracking to my company's website. The company website uses server side includes, so making modifications to the tracking code happens identically everywhere. Maintenance is therefore a headache. Also, GA takes about twenty-four hours for custom variables to start showing up in reports and that makes troubleshooting a headache. So if you have custom variables // visitor level tracking, id = 12345 _gaq.push(['_setCustomVar', 1, 'id', '12345', 1]); // page level tracking, email = [email protected] _gaq.push(['_setCustomVar', 1, 'email', '[email protected]', 1]); The marketing people want the following out of this: User visits site and we record a unique id for them. Whenever they return this id will be used in GA. User signs up for our newsletter on page X and we record their email address. Whenever they return this email address is used in GA. Now a big problem for me is that I don't use GA and the marketing people don't use custom variables. So we don't actually know how this will work. Do I want Page, Session or Visitor level tracking? What happens because the same GA code is used on every page? If they visit the email sign up form and we record the email address, but then they go somewhere else where email is nonexistent will the value get 'overwritten.' Sorry for the long question, but there are a lot of unknowns for a GA noob.

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  • DLL search on windows

    - by Luís Guilherme
    On linux, we have LIBRARY_PATH and LD_LIBRARY_PATH environment variables in order for programs to search for libraries. Do we have similar thing on windows? Particularly Windows 7? Also, I would like to know best practices for DLL use (where to put them, use envs or not, etc.), since I want to work on windows like everyone does, and not to sloth myself on workarounds :)

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  • what variable i can use instead of shared?

    - by SmartestVEGA
    I have the following variable which creates problem when i use multiples instance of the same web form. Could you please let me know how i could what variables other than shared i can use to achieve this purpose? Public strRoleType As String = String.Empty Protected Shared isAreaSelected As Integer = 0 Protected Shared isStoreSelected As Integer = 0 Protected Shared isHeadOfficeSelected As Integer = 0 Protected Shared isRegionSelected As Integer = 0

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  • How can I trace a variable at runtime in C#?

    - by luvieere
    How can I track a variable's values as they change, at runtime, in C#? I'm interested in the same functionality that the debugger provides when I'm tracing a variable through execution steps, only that I need to call upon it from my code. Some sort of key-value observing, but for all kinds of variables(local, class, static, etc), not only properties. So, basically, receive a notification when a variable's value changes.

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  • set windows PATH environment variable at runtime in Java

    - by hhhh
    I have a java program that fires off an executable using the Runtime.exec() method. I'm using the variant that takes in a set of command line params as one argument, and some environment variables as another argument. The environment variable I'm tryign to set is path, so i'm passing in "PATH=C:\some\path". This does not work. Is there some trick to this or any alternatives. I am stuck to Java 1.4 unfortunately.

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  • C variable declarations after function heading in definition

    - by Yktula
    When reading some FreeBSD source code (See: radix.h lines 158-173), I found variable declarations that followed the "function heading" in the definition. Is this valid in ISO C (C99)? when should this be done in production code instead of just declaring the variables within the "function heading?" Why is it being done here? I refer to the function heading the string that looks like this: int someFunction(int i, int b) {

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  • How do I call setattr() on the current module?

    - by Matt Joiner
    What do I pass as the first parameter "object" to the function setattr(object, name, value), to set variables on the current module? For example: setattr(object, "SOME_CONSTANT", 42); giving the same effect as: SOME_CONSTANT = 42 within the module containing these lines (with the correct object). I'm generate several values at the module level dynamically, and as I can't define __getattr__ at the module level, this is my fallback.

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  • Auto-Completion in Unix VI editor

    - by IllustratedInsomnia
    Hey guys, after using graphical IDE's like Visual Studio, I'm used to pressing CTRL+Space to auto-complete a variable or function name. Now, I know such a thing isn't completely possible in VI, but I heard there was a list of commands that could be mapped that allowed automatic completion of variables and functions in the current file opened. Does anyone know what this sequence is? Thanks in advance.

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  • Accessing an owners variable

    - by Dyldo42
    Okay, I have a ViewController that has 12 UIButtons as instance variables, and they are created in interface builder. I want to access another variable in the viewController from the UIButton's init method. Is that possible? By the way, I'm writing in Objective-C in the iPhone SDK. Cheers.

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  • What is the naming convention in Python for variable and function names?

    - by Ray Vega
    Coming from a C# background the naming convention for variables and method names are usually either CamelCase or Pascal Case: // C# example string thisIsMyVariable = "a" public void ThisIsMyMethod() In Python, I have seen the above but I have also seen underscores being used: # python example this_is_my_variable = 'a' def this_is_my_function(): Is there a more preferable, definitive coding style for Python?

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  • Refreshing page after posted vars

    - by Pete Herbert Penito
    So a form is submitted on my site, with form action equal to itself. I want the user to be able to refresh the page without sending the same variables again. I thought unset($_POST); would accomplish this for some reason it doesn't is there another way to accomplish this?

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  • how do i set up a grails environment variable

    - by TripWired
    I'm uploading images in a grails app I'm developing and I want to be able to have an environment variable the determines where these images are. So if I'm working locally it can just pull from /home/MyName/images but once it's in production it will pull from http://images.site.com. How would I do that? I'm assuming i can set up my config.groovy with the variables i'm just not sure how i switch between them or use them in code.

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  • What's the scope of a Python variable declared in an if statement?

    - by froadie
    I'm new to Python, so this is probably a simple scoping question. The following code in a Python file (module) is confusing me slightly: if __name__ == '__main__': x = 1 print x In other languages I've worked in, this code would throw an exception, as the x variable is local to the if statement and should not exist outside of it. But this code executes, and prints 1. Can anyone explain this behavior? Are all variables declared in a module global/available to the entire module?

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  • Allowed characters in linux environment variable names

    - by Christian Semrau
    What characters are allowed in linux environment variable names? My cursory search of man pages and the web did only produce information about how to work with variables, but not which names are allowed. I have a Java program that requires an defined environment variable containing a dot, like com.example.fancyproperty. With Windows I can set that variable, but I had no luck setting it in linux (tried in SuSE and Ubuntu). Is that variable name even allowed?

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