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How to echo shell commands as they are executed

In a shell script, how do I echo all shell commands called and expand any variable names? 13 Answers ...
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android edittext onchange listener

I know a little bit about TextWatcher but that fires on every character you enter. I want a listener that fires whenever the user finishes editing. Is it possible? Also in TextWatcher I get an instance of Editable but I need an instance of EditText . How do I get that? ...
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Print PHP Call Stack

I'm looking for a way to print the call stack in PHP. 15 Answers 15 ...
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Difference between signed / unsigned char [duplicate]

So I know that the difference between a signed int and unsigned int is that a bit is used to signify if the number if positive or negative, but how does this apply to a char ? How can a character be positive or negative? ...
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How do I POST JSON data with cURL?

I use Ubuntu and installed cURL on it. I want to test my Spring REST application with cURL. I wrote my POST code at the Java side. However, I want to test it with cURL. I am trying to post a JSON data. Example data is like this: ...
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Bootstrap: Position of dropdown menu relative to navbar item

I have the following dropdown 7 Answers 7 ...
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Linux command to list all available commands and aliases

Is there a Linux command that will list all available commands and aliases for this terminal session? 20 Answers ...
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Bash: Strip trailing linebreak from output

When I execute commands in Bash (or to be specific, wc -l < log.txt ), the output contains a linebreak after it. How do I get rid of it? ...
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The term 'Update-Database' is not recognized as the name of a cmdlet

I am using EF5 beta1 and while I was able to run the "Update-Database" before. Now that I shut down Visual Studio, I cannot get it to run. I get the following error: ...
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How to succinctly write a formula with many variables from a data frame?

Suppose I have a response variable and a data containing three covariates (as a toy example): 6 Answers ...