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Get program execution time in the shell

I want to execute something in a linux shell under a few different conditions, and be able to output the execution time of each execution. ...
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Can I replace groups in Java regex?

I have this code, and I want to know, if I can replace only groups (not all pattern) in Java regex. Code: 7 Answers ...
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In git, what is the difference between merge --squash and rebase?

I'm new to git and I'm trying to understand the difference between a squash and a rebase. As I understand it you perform a squash when doing a rebase. ...
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Get name of current class?

How do I get the name of the class I am currently in? 7 Answers 7 ...
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Any difference between First Class Function and High Order Function

I'm wondering whether/what difference between First Class Function and High Order Function . 6 Answers ...
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Get string character by index - Java

I know how to work out the index of a certain character or number in a string, but is there any predefined method I can use to give me the character at the nth position? So in the string "foo", if I asked for the character with index 0 it would return "f". ...
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GIT: Checkout to a specific folder

...per Do a "git export" (like "svn export")? You can use git checkout-index for that, this is a low level command, if you want to export everything, you can use -a, git checkout-index -a -f --prefix=/destination/path/ To quote the man pages: The final "/" [on the prefix] is important. The expo...
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How do I view all commits for a specific day?

I've already looked at the relevant docs from git-scm.com and gitref.org , but I can't seem to figure this out. 5 Answe...
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Why is lazy evaluation useful?

I have long been wondering why lazy evaluation is useful. I have yet to have anyone explain to me in a way that makes sense; mostly it ends up boiling down to "trust me". ...
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In Unix, how do you remove everything in the current directory and below it?

... Practice safe computing. Simply go up one level in the hierarchy and don't use a wildcard expression: cd ..; rm -rf -- <dir-to-remove> The two dashes -- tell rm that <dir-to-remove> is not a command-line option, even whe...