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How to remove the lines which appear on file B from another file A?
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If the files are sorted (they are in your example):
comm -23 file1 file2
-23 suppresses the lines that are in both files, or only in file 2. If the files are not sorted, pipe them through sort first...
See the man page here
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NodeJS - What does “socket hang up” actually mean?
... @BigMoney you could use setTimeout(). see this question: stackoverflow.com/questions/6214902/…
– the holla
Nov 7 '16 at 16:53
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Function in JavaScript that can be called only once
...// "do something" happens
something(); // nothing happens
In answer to a comment by @Vladloffe (now deleted): With a global variable, other code could reset the value of the "executed" flag (whatever name you pick for it). With a closure, other code has no way to do that, either accidentally or de...
Is it safe to check floating point values for equality to 0?
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It is safe to expect that the comparison will return true if and only if the double variable has a value of exactly 0.0 (which in your original code snippet is, of course, the case). This is consistent with the semantics of the == operator. a == b means "...
Is there a vim command to relocate a tab?
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I have VIM - Vi IMproved 7.3 (2010 Aug 15, compiled Apr 2 2013 09:17:34) Included patches: 1-547 and +- not supported there, documentation said I should specify zero or positive value
– Vladimir
Sep 10 '13 at 13:41
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Where is Java's Array indexOf?
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There are a couple of ways to accomplish this using the Arrays utility class.
If the array is not sorted and is not an array of primitives:
java.util.Arrays.asList(theArray).indexOf(o)
If the array is primitives and not sorted, one should use a solution...
Bash continuation lines
...arameter separator) and are now only printed correctly because of the echo command.
– user880248
Sep 6 '11 at 7:19
1
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How do I sort a vector of pairs based on the second element of the pair?
...ght) {
return left.second < right.second;
});
Just use a custom comparator (it's an optional 3rd argument to std::sort)
struct sort_pred {
bool operator()(const std::pair<int,int> &left, const std::pair<int,int> &right) {
return left.second < right.seco...
How to show the “Are you sure you want to navigate away from this page?” when changes committed?
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For a simple check, or you can add more complex validation on each change
– Keith
Jul 13 '09 at 15:09
1
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How to determine when Fragment becomes visible in ViewPager
...oblem: Fragment onResume() in ViewPager is fired before the fragment becomes actually visible.
26 Answers
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