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Check if bash variable equals 0 [duplicate]

...and appears empty to bash. You can verify this using the below tests which all evaluate to true because xyz is either empty or unset: if [ -z ] ; then echo "true"; else echo "false"; fi xyz=""; if [ -z "$xyz" ] ; then echo "true"; else echo "false"; fi unset xyz; if [ -z "$xyz" ] ; then echo "t...
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Keep SSH session alive [closed]

...om ServerAliveInterval 240 To enable sending a keep-alive signal for all hosts, place the following contents in the configuration file: Host * ServerAliveInterval 240 share | improve thi...
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C compile error: “Variable-sized object may not be initialized”

... I am assuming that you are using a C99 compiler (with support for dynamically sized arrays). The problem in your code is that at the time when the compilers sees your variable declaration it cannot know how many elements there are in the array (I am also assuming here, from the compiler error that...
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AngularJS : Why ng-bind is better than {{}} in angular?

... not (yet). Remember that it's client-side templating we're talking about. All the interpolation has to be done in the browser loading the app. Usually angular loads fast enough for it not to be noticeable, but in some cases it becomes a problem. So, ng-cloak was invented to mend this problem. ...
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How do I get the current version of my iOS project in code?

...to make this extension on NSBundle instead of UIApplication this will also allow to replace static calls with the instance ones. – Zapko Dec 9 '16 at 1:03 ...
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Why does Node.js' fs.readFile() return a buffer instead of string?

... try fs.readFile("test.txt", "utf8", function(err, data) {...}); basically you need to specify the encoding. share | improve this answer | follow | ...
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EC2 Can't resize volume after increasing size

... Thank you Wilman your commands worked correctly, small improvement need to be considered if we are increasing EBSs into larger sizes Stop the instance Create a snapshot from the volume Create a new volume based on the snapshot increasing the size Check and remember the curr...
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Detecting arrow key presses in JavaScript

... @MrCroft - or also listen to onkeyup and stop the event there. Realistically you shouldn't be modifying UI behavior with Javascript, however. – Mark Kahn Jan 5 '17 at 19:52 ...
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Show data on mouseover of circle

...u don't need the mousehandler. The code would be something like vis.selectAll("circle") .data(datafiltered).enter().append("svg:circle") ... .append("svg:title") .text(function(d) { return d.x; }); If you want fancier tooltips, you could use tipsy for example. See here for an example....
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Conversion of System.Array to List

... None of these examples actually answer the actual question. But I guess he accepted the answer so he was happy. Still, not one of these actually convert an Array to a List. "Conversion of System.Array to List". Should add that example for completeness ...