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Is there any way to git checkout previous branch?

... sort of want the equivalent of cd - for git. If I am in branch master and I checkout foo , I would love to be able to type something like git checkout - to go back to master , and be able to type it again to return to foo . ...
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PSQLException: current transaction is aborted, commands ignored until end of transaction block

... I got this error using Java and PostgreSQL doing an insert on a table. I will illustrate how you can reproduce this error: org.postgresql.util.PSQLException: ERROR: current transaction is aborted, commands ignored until end of transaction block Summa...
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Batch file to delete files older than N days

...ll files older than 7 days in a batch file. I've searched around the web, and found some examples with hundreds of lines of code, and others that required installing extra command line utilities to accomplish the task. ...
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What is the difference between ManualResetEvent and AutoResetEvent in .NET?

I have read the documentation on this and I think I understand. An AutoResetEvent resets when the code passes through event.WaitOne() , but a ManualResetEvent does not. ...
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The new keyword “auto”; When should it be used to declare a variable type? [duplicate]

Have we (as a community) had enough experience to determine when and/or whether auto is being abused? 6 Answers ...
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How do I move an existing Git submodule within a Git repository?

...ules: Since git 1.8.5, git mv old/submod new/submod works as expected and does all the plumbing for you. You might want to use git 1.9.3 or newer, because it includes fixes for submodule moving. The process is similar to how you'd remove a submodule (see How do I remove a submodule?): Edi...
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Flexbox: center horizontally and vertically

How to center div horizontally, and vertically within the container using flexbox. In below example, I want each number below each other (in rows), which are centered horizontally. ...
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Way to go from recursion to iteration

... needed. ... } Note: if you have more than one recursive call inside and you want to preserve the order of the calls, you have to add them in the reverse order to the stack: foo(first); foo(second); has to be replaced by stack.push(second); stack.push(first); Edit: The article Stacks and Rec...
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Difference between CC, gcc and g++?

...t are the difference between the 3 compilers CC, gcc, g++ when compiling C and C++ code in terms of assembly code generation, available libraries, language features, etc.? ...
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Why isn't sizeof for a struct equal to the sum of sizeof of each member?

...y alignment constraints. Data structure alignment impacts both performance and correctness of programs: Mis-aligned access might be a hard error (often SIGBUS). Mis-aligned access might be a soft error. Either corrected in hardware, for a modest performance-degradation. Or corrected by emulation...