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How can I check if a command exists in a shell script? [duplicate]
...my first shell script. In my script I would like to check if a certain command exists, and if not, install the executable. How would I check if this command exists?
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How long does it take for GitHub page to show changes after changing index.html
...t (or break a cache) you can append a query string like myfile.jpg?ver=123 and every time you update the string the cache will bust, and you can verify that the CDN is updating.
– Joel Glovier
Dec 19 '16 at 14:10
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Android Fragment onClick button Method
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If you don't want the above in activity. initialize button in fragment and set listener to the same.
<Button
android:id="@+id/btn_conferma" // + missing
Then
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View...
How to use null in switch
... Integer or other Wrapper class, because of unboxing. But what about enums and strings? Why can't they be null?
– Luan Nico
Nov 2 '13 at 11:20
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Android: Clear the back stack
In Android I have some activities, let's say A, B, C.
38 Answers
38
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Why can't I push to this bare repository?
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I'm doing sudo apt-get upgrade git-core and sudo apt-get upgrade git and it think no update is necessary. git --version returns 1.7.3.1. Any idea what's missing? I admit currently apt-get update doesn't work for me, but it did not too long ago.
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Best way to define error codes/strings in Java?
I am writing a web service in Java, and I am trying to figure out the best way to define error codes and their associated error strings . I need to have a numerical error code and an error string grouped together. Both the error code and error string will be sent to the client accessing the web ser...
How do I negate a condition in PowerShell?
...ld also use bitwise exclusive or, though it's not the most readable/understandable method.
if ((test-path C:\code) -bxor 1) {write "it doesn't exist!"}
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C# Regex for Guid
I need to parse through a string and add single quotes around each Guid value. I was thinking I could use a Regex to do this but I'm not exactly a Regex guru.
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Merging two arrays in .NET
Is there a built in function in .NET 2.0 that will take two arrays and merge them into one array?
21 Answers
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