大约有 9,000 项符合查询结果（耗时：0.0113秒） [XML]
How to create a bash script to check the SSH connection?
...
You can check this with the return-value ssh gives you:
$ ssh -q user@downhost exit
$ echo $?
255
$ ssh -q user@uphost exit
$ echo $?
0
EDIT: Another approach would be to use nmap (you won't need to have keys or login-stuff):
$ a=`nmap uphost -PN -p ssh | grep open`
$ b=`nmap downhos...
How to remove an item for a OR'd enum?
...lue 'X') and the complement of one or more set bits (let's call those bits Q and their complement ~Q), the statement X & ~Q clears any bits that were set in Q from X and returns the result.
So to remove or clear the BLUE bits, you use the following statement:
colorsWithoutBlue = colors & ~...
read subprocess stdout line by line
...e: according to the documentation the solution with an iterator should be equivalent to using readline(), except for the read-ahead buffer, but (or exactly because of this) the proposed change did produce different results for me (Python 2.5 on Windows XP).
...
How to find all combinations of coins when given some dollar value
...
Good answer, but minor quibbles: note that (1) This gives the number of ways, while for some reason the question asks for the actual set of all ways. Of course, there can be no way of finding the set in polynomial time, since the output itself has ...
regex.test V.S. string.match to know if a string matches a regular expression
...
@AlexShilman indexOf is faster (but not much) than test according to this stackoverflow.com/questions/183496/… (you'd expect it to be faster).
– podperson
Jul 21 '16 at 20:51
...
How to return multiple objects from a Java method?
...
package util;
public class Pair<A,B> {
public static <P, Q> Pair<P, Q> makePair(P p, Q q) {
return new Pair<P, Q>(p, q);
}
public final A a;
public final B b;
public Pair(A a, B b) {
this.a = a;
this.b = b;
}
@Overri...
Removing duplicates from a list of lists
... as the key, and print the keys.
create dictionary with tuple as key and index as value
print list of keys of dictionary
k = [[1, 2], [4], [5, 6, 2], [1, 2], [3], [4]]
dict_tuple = {tuple(item): index for index, item in enumerate(k)}
print [list(itm) for itm in dict_tuple.keys()]
# prints [...
Dynamic variable names in Bash
...
@DeaDEnD -a declares an indexed array, not an associative array. Unless the argument to grep_search is a number, it will be treated as a parameter with a numeric value (which defaults to 0 if the parameter isn't set).
– chepner...
In Perl, how can I read an entire file into a string?
...
I would do it like this:
my $file = "index.html";
my $document = do {
local $/ = undef;
open my $fh, "<", $file
or die "could not open $file: $!";
<$fh>;
};
Note the use of the three-argument version of open. It is much safer than ...
What does “Document-oriented” vs. Key-Value mean when talking about MongoDB vs Cassandra?
...s exactly what the name suggests: it's a storage system that stores values indexed by a key. You're limited to query by key and the values are opaque, the store doesn't know anything about them. This allows very fast read and write operations (a simple disk access) and I see this model as a kind of ...