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Delete empty lines using sed
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You may have spaces or tabs in your "empty" line. Use POSIX classes with sed to remove all lines containing only whitespace:
sed '/^[[:space:]]*$/d'
A shorter version that uses ERE, for example with gnu sed:
sed -r '/^\s*$/d'
(Note that se...
Rounded UIView using CALayers - only some corners - How?
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I used the answer over at How do I create a round cornered UILabel on the iPhone? and the code from How is a rounded rect view with transparency done on iphone? to make this code.
Then I realized I'd answered the wrong question (gave a rounded UILabel instead of UIImage) so...
Determine whether an array contains a value [duplicate]
...xOf = function(needle) {
var i = -1, index = -1;
for(i = 0; i < this.length; i++) {
var item = this[i];
if((findNaN && item !== item) || item === needle) {
index = i;
break;
}...
PermGen elimination in JDK 8
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Reasons of ignoring these argument is permanent generation has been removed in HotSpot for JDK8 because of following drawbacks
Fixed size at startup – difficult to tune.
Internal Hotspot types were Java objects : Could move with full GC...
Stash just a single file
...is probably the choice you want, but just in case you run into other even more tricky things in the future, remember that:
Stash is really just a very simple alternative to the only slightly more complex branch sets. Stash is very useful for moving things around quickly, but you can accomplish mor...
Checking if all elements in a list are unique
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Not the most efficient, but straight forward and concise:
if len(x) > len(set(x)):
pass # do something
Probably won't make much of a difference for short lists.
share
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How do I check for nulls in an '==' operator overload without infinite recursion?
The following will cause infinite recursion on the == operator overload method
13 Answers
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How to delete all files and folders in a directory?
Using C#, how can I delete all files and folders from a directory, but still keep the root directory?
29 Answers
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How to prevent buttons from submitting forms
In the following page, with Firefox the remove button submits the form, but the add button does not.
17 Answers
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What is the fastest way to create a checksum for large files in C#
...o see how much it reads from the filestream), which is too small a buffer for disk IO.
To speed things up (2 minutes for hashing 2 Gb file on my machine with SHA256, 1 minute for MD5) wrap FileStream in BufferedStream and set reasonably-sized buffer size (I tried with ~1 Mb buffer):
// Not sure if...