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How to represent multiple conditions in a shell if statement?

...n this particular case, the parentheses aren't even needed, because -a actually has higher precedence than -o (unlike && and || in the shell - however, inside bash [[ ... ]] conditionals, && also has higher precedence than || ). If you wanted to avoid -a and -o for maximum robustness...
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Best Timer for using in a Windows service

...those will cause the service to load an additional assembly which is not really needed for the type of application you are building. Use System.Timers.Timer like the following example (also, make sure that you use a class level variable to prevent garbage collection, as stated in Tim Robinson's ans...
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How can I run PowerShell with the .NET 4 runtime?

... that will change the .NET framework loaded systemwide, which will in turn allow PowerShell to use .NET 4.0 classes: reg add hklm\software\microsoft\.netframework /v OnlyUseLatestCLR /t REG_DWORD /d 1 reg add hklm\software\wow6432node\microsoft\.netframework /v OnlyUseLatestCLR /t REG_DWORD /d 1 ...
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Git: Create a branch from unstaged/uncommitted changes on master

...tatus still show your local changes, although you are on master. If you really want to discard the local changes, you have to force the checkout with -f. git checkout master -f Since your changes were never committed, you'd lose them. Try to get back to your branch, commit your changes, then ch...
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Auto start node.js server on boot

... This isn't something to configure in node.js at all, this is purely OS responsibility (Windows in your case). The most reliable way to achieve this is through a Windows Service. There's this super easy module that installs a node script as a windows service, it's called n...
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bash: mkvirtualenv: command not found

... Solution 1: For some reason, virtualenvwrapper.sh installed in /usr/bin/virtualenvwrapper.sh, instead of under /usr/local/bin. The following in my .bash_profile works... source "/usr/bin/virtualenvwrapper.sh" export WORKON_HOME="/opt/virtual_env/" My install seems to work fi...
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How can I programmatically get the MAC address of an iphone

How to programmatically get an iPhone's MAC address and IP address? 12 Answers 12 ...
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How to configure postgresql for the first time?

I have just installed postgresql and I specified password x during installation. When I try to do createdb and specify any password I get the message: ...
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How do you get an iPhone's device name

... Be careful: the tutorial at that link, while quite useful, is aimed at OS 2.2, and uses some methods that are deprecated in 3.0. – Tim Jul 8 '09 at 19:49 ...
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find first sequence item that matches a criterion [duplicate]

What would be the most elegant and efficient way of finding/returning the first list item that matches a certain criterion? ...