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Linux how to copy but not overwrite? [closed]
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Note, this will exit with an error if the file exists. To exit with success, try cp -n source.txt destination.txt || true
– galenandrew
Apr 1 '16 at 16:38
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When is layoutSubviews called?
...e
intelligently calls layoutSubviews on
the view having its frame set only
if the size parameter of the frame is
different
scrolling a UIScrollView
causes layoutSubviews to be called on
the scrollView, and its superview
rotating a device only calls
layoutSubview on the parent view (the
responding vi...
How to Parse Command Line Arguments in C++? [duplicate]
What is the best way of parsing command-line arguments in C++ if the program is specified
to be run like this:
10 Answers
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How to do stateless (session-less) & cookie-less authentication?
...quest to authenticate the user. This, in my opinion, is unsafe, especially if the application isn't single page. It is also not scalable, especially if you want to add authorization to your app in addition to authentication in the future (although I guess you could build something based on logins to...
Is assert evil? [closed]
...isused.
Assert is for sanity checks. Things that should kill the program if they are not correct. Not for validation or as a replacement for error handling.
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Pass all variables from one shell script to another?
...ariables like arrays easily, but also means that the other script could modify variables in the source shell.
UPDATE:
To use export to set an environment variable, you can either use an existing variable:
A=10
# ...
export A
This ought to work in both bash and sh. bash also allows it to be co...
Best practice for creating millions of small temporary objects
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Escape analysis often disappoints, it is worth checking if the JVM has figured out what you're doing or not.
– Nitsan Wakart
May 8 '13 at 8:09
2
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Linq to Sql: Multiple left outer joins
... dc.Vendors
.Where(v => v.Id == order.VendorId)
.DefaultIfEmpty()
from status
in dc.Status
.Where(s => s.Id == order.StatusId)
.DefaultIfEmpty()
select new { Order = order, Vendor = vendor, Status = status }
//Vendor and Status properties will ...
Should struct definitions go in .h or .c file?
... for that file should go in the .c file, with a declaration in the .h file if they are used by any functions in the .h .
Public structures should go in the .h file.
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Validating URL in Java
I wanted to know if there is any standard APIs in Java to validate a given URL?
I want to check both if the URL string is right i.e. the given protocol is valid and then to check if a connection can be established.
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