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How can I check if a program exists from a Bash script?
...y do what you want, while the effects of external commands can easily vary from system to system.
Why care?
Many operating systems have a which that doesn't even set an exit status, meaning the if which foo won't even work there and will always report that foo exists, even if it doesn't (note that ...
Update Git branches from master
...for b2 and b3
This leaves the history exactly as it happened: You forked from master, you made changes to all branches, and finally you incorporated the changes from master into all three branches.
git can handle this situation really well, it is designed for merges happening in all directions, a...
Using %f with strftime() in Python to get microseconds
...strftime accepts a timetuple that does not carry microsecond information.
from datetime import datetime
datetime.now().strftime("%H:%M:%S.%f")
Should do the trick!
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How to concatenate a std::string and an int?
.../all platforms
safe, slow, and verbose; requires #include <sstream> (from standard C++)
is brittle (you must supply a large enough buffer), fast, and verbose; itoa() is a non-standard extension, and not guaranteed to be available for all platforms
is brittle (you must supply a large enough buf...
How to prevent scrollbar from repositioning web page?
...enter-aligned DIV. Now, some pages need scrolling, some don't. When I move from one type to another, the appearance of a scrollbar moves the page a few pixels to the side. Is there any way to avoid this without explicitly showing the scrollbars on each page?
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Install Application programmatically on Android
...if it is possible to programmatically install a dynamically downloaded apk from a custom Android application.
16 Answers
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How to save a git commit message from windows cmd?
I run git from the command line.
6 Answers
6
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Vagrant reverse port forwarding?
...ide the guest machine, and the last two are the service address as visible from the host machine.
– Eero
May 13 '13 at 12:33
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How is std::function implemented?
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The implementation of std::function can differ from one implementation to another, but the core idea is that it uses type-erasure. While there are multiple ways of doing it, you can imagine a trivial (not optimal) solution could be like this (simplified for the specific c...
iPhone: Detecting user inactivity/idle time since last screen touch
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Hi Mike, My AppDelegate is inherting from NSObject So changed it UIApplication and Implement above methods to detect user becoming idle but i am getting error "Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'There can only ...