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Perform an action in every sub-directory using Bash
...esn't print each word in a folder name as a separate entity.
# Option A
$ time for D in ./big_dir/*; do find "$D" -type d > /dev/null; done
real 0m0.327s
user 0m0.084s
sys 0m0.236s
# Option B
$ time for D in `find ./big_dir/* -type d`; do echo "$D" > /dev/null; done
real 0m0.787...
Why does C++11's lambda require “mutable” keyword for capture-by-value, by default?
...because by default, a function object should produce the same result every time it's called. This is the difference between an object orientated function and a function using a global variable, effectively.
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What's the difference between an object initializer and a constructor?
...t a variable when using an initializer list, you won't notice it until run-time (and maybe not even immediately). Furthermore: the field can't be readonly, making accidental changes possible, without the compiler complaining
– Harald Coppoolse
Jan 19 '17 at 9:1...
When is it practical to use Depth-First Search (DFS) vs Breadth-First Search (BFS)? [closed]
... solutions are rare, depth first search
(DFS) might take an extremely long time, but BFS could be faster.
If the tree is very wide, a BFS might need too much memory, so it
might be completely impractical.
If solutions are frequent but located deep in the tree, BFS could be
impractical.
If the sea...
List Git aliases
...ias called (strangely enough) alias for exactly this purpose... handy from time to time if you use aliasing enough...
$ git config --global alias.alias "config --get-regexp ^alias\."
Note, the regex makes sure the line starts with alias..
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Standard concise way to copy a file in Java?
...VisitDirectory(Path dir, IOException exc) {
// fix up modification time of directory when done
if (exc == null && Arrays.toList(options).contains(COPY_ATTRIBUTES)) {
Path newdir = target.resolve(source.relativize(dir));
try {
FileTime t...
How to input a regex in string.replace?
...here is an excellent online tutorial at: www.regular-expressions.info. The time you spend there will pay for itself many times over. Happy regexing!
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Error 908: Permission Receive SMS - #5 by Taifun - MIT App Inventor Help - MIT App Inventor Community
...sions are included in the manifest and, if Android >= 6.0, requested at runtime.
Prior to this change, ReceivingEnabled was default Foreground, not Off. Therefore, older tutorials may not work since they assume the old behavior. People will need to consciously enable the receiving option to recei...
How to convert timestamp to datetime in MySQL?
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Use the FROM_UNIXTIME() function in MySQL
Remember that if you are using a framework that stores it in milliseconds (for example Java's timestamp) you have to divide by 1000 to obtain the right Unix time in seconds.
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Why should eval be avoided in Bash, and what should I use instead?
Time and time again, I see Bash answers on Stack Overflow using eval and the answers get bashed, pun intended, for the use of such an "evil" construct. Why is eval so evil?
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