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C# 'is' operator performance
...at it then returns null instead of false.
– Konrad Rudolph
Nov 29 '09 at 23:55
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How to rollback a specific migration?
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rake db:rollback STEP=1
Is a way to do this, if the migration you want to rollback is the last one applied. You can substitute 1 for however many migrations you want to go back.
For example:
rake db:rollback STEP=5
Will also rollback all the migration that ...
How to edit incorrect commit message in Mercurial? [duplicate]
...Hg (Mercurial) and accidentally committed an incorrect commit message. How do I go about editing this commit message in the repository?
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Android - get children inside a View?
... View nextChild = ((ViewGroup) viewGroup).getChildAt(index);
}
Will that do?
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Remove Safari/Chrome textinput/textarea glow
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Edit (11 years later): Don't do this unless you're going to provide a fallback to indicate which element is active. Otherwise, this harms accessibility as it essentially removes the indication showing which element in a document has focus. Imagine ...
How do different retention policies affect my annotations?
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RetentionPolicy.SOURCE: Discard during
the compile. These annotations don't
make any sense after the compile has
completed, so they aren't written to
the bytecode.
Example: @Override, @SuppressWarnings
RetentionPolicy.CLASS: Discard during
class load. Useful when doing
bytecode-...
How to get the part of a file after the first line that matches a regular expression?
...each you need to use:
head -n -1 before
tail -n +2 after
Edit2:
IF you do not want to hard-code the filenames in the sed script, you can:
before=before.txt
after=after.txt
sed -e "1,/TERMINATE/w $before
/TERMINATE/,\$w $after" file
But then you have to escape the $ meaning the last line so th...
How do I get an apk file from an Android device?
How do I get the apk file from an android device? Or how do I transfer the apk file from device to system?
24 Answers
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Should commit messages be written in present or past tense? [closed]
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I think of these messages as they appear to other developers. They don't yet have the changes applied, and there is the implicit question, "what will applying this changeset/patch do?" It will "Fix the XXX bug in YYY"!
For other verbs writing them as a command seems more natural, and works...
Make xargs execute the command once for each line of input
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The following will only work if you do not have spaces in your input:
xargs -L 1
xargs --max-lines=1 # synonym for the -L option
from the man page:
-L max-lines
Use at most max-lines nonblank input lines per command line.
Trailing blank...