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What's a concise way to check that environment variables are set in a Unix shell script?

I've got a few Unix shell scripts where I need to check that certain environment variables are set before I start doing stuff, so I do this sort of thing: ...
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proper way to sudo over ssh

I have a script which runs another script via SSH on a remote server using sudo. However, when I type the password, it shows up on the terminal. (Otherwise it works fine) ...
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Detect changes in the DOM

...omChange = onDomChange; })(window); Usage: onDomChange(function(){ alert("The Times They Are a-Changin'"); }); This works on IE 5.5+, FF 2+, Chrome, Safari 3+ and Opera 9.6+ share | improv...
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Response.Redirect to new window

... open in a new browser window. I've done this before without using the JavaScript register script method. I just can't remember how? ...
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Can you pass parameters to an AngularJS controller on creation?

...; <html ng-app="angularjs-starter"> <head lang="en"> <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.min.js"></script> <script src="app.js"></script> </head> <body ng-controller="MainCtrl" ng-init="init('James Bond','0...
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How do I unset an element in an array in javascript?

...;. Thus: var myArray = []; myArray["bar"] = true; myArray["foo"] = true; alert(myArray.length); // returns 0. because you have not added elements to the array, you have only modified myArray's bar and foo members. share ...
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pip broke. how to fix DistributionNotFound error?

... '__main__': sys.exit( load_entry_point('pip==0.8.2', 'console_scripts', 'pip')() ) I installed pip through easy_install which probably caused me this headache. I think this is how you should do it nowadays.. $ sudo apt-get install python-pip python-dev build-essential $ sudo pip...
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Cron jobs and random times, within given hours

I need the ability to run a PHP script 20 times a day at completely random times. I also want it to run only between 9am - 11pm. ...
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Bash: Syntax error: redirection unexpected

I do this in a script: 9 Answers 9 ...
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How to handle command-line arguments in PowerShell

... You are reinventing the wheel. Normal PowerShell scripts have parameters starting with -, like script.ps1 -server http://devserver Then you handle them in param section in the beginning of the file. You can also assign default values to your params, read them from console...