大约有 40,000 项符合查询结果（耗时：0.0461秒） [XML]
Remove duplicate lines without sorting [duplicate]
...arger files, a Schwartzian transform approach involving the addition of an index field using awk followed by multiple rounds of sort and uniq involves less memory overhead. The following snippet works in bash
awk '{print(NR"\t"$0)}' file_name | sort -t$'\t' -k2,2 | uniq --skip-fields 1 | sort -k1,1...
Getting parts of a URL (Regex)
...
I modified this regex to identify all parts of the URL (improved version) - code in Python ^((?P<scheme>[^:/?#]+):(?=//))?(//)?(((?P<login>[^:]+)(?::(?P<password>[^@]+)?)?@)?(?P<host>[^@/?#:]*)(?::(?P<port>\d+)?)?)?(?P<path&g...
Run JavaScript code on window close or page refresh?
...ntListener("beforeunload", function(e){
// Do something
}, false);
Usually, onbeforeunload is used if you need to stop the user from leaving the page (ex. the user is working on some unsaved data, so he/she should save before leaving). onunload isn't supported by Opera, as far as I know, but yo...
How to cast an Object to an int
...so use object.hashCode(), but it can be type specific.
Scenario 5: unique index
In same cases you need a unique index for each object, like to auto incremented ID values in a database table (and unlike to identity hash which is not unique). A simple sample implementation for this:
class ObjectInd...
What are the rules for evaluation order in Java?
...at does not mean that the b=0 runs first! The rules of precedence say that indexing is higher precedence than assignment, but that does not mean that the indexer runs before the rightmost assignment.
(UPDATE: An earlier version of this answer had some small and practically unimportant omissions in ...
Difference between “git checkout ” and “git checkout -- ”
...s out the branch <name>. git checkout -- <name> checks out the index version of the file <name>.
– dunni
Jul 3 '11 at 9:33
...
How can I get the SQL of a PreparedStatement?
...
Although this is functionally true, there's nothing preventing utility code from reconstructing an equivalent unprepared statement. For example, in log4jdbc: "In the logged output, for prepared statements, the bind arguments are automatically insert...
How can I apply a function to every row/column of a matrix in MATLAB?
...nc, myMx)
??? Error using ==> arrayfun
Non-scalar in Uniform output, at index 1, output 1.
Set 'UniformOutput' to false.
Error in ==> @(func,matrix)arrayfun(applyToGivenRow(func,matrix),1:size(matrix,1))'
share
...
How can I parse a YAML file from a Linux shell script?
...n to select sub-values (ie: subvalue.maintainer is a valid key).
access by index is provided to sequences (ie: subvalue.things.-1 is the last element of the subvalue.things sequence.)
access to all sequence/structs elements in one go for use in bash loops.
you can output whole subpart of a YAML fil...
Does Foreign Key improve query performance?
...t least in SQL Server, the creation of an FK does not create an associated index, and you should create indexes on all FK fields to improve look up times.
share
|
improve this answer
|
...