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write a shell script to ssh to a remote machine and execute commands
...e; hostname -f'
If the file hosts.txt has a large number of entries, say 100, then the parallelism option may also be set to 100 to ensure that the commands are run concurrently:
pssh -i -h hosts.txt -p 100 -t 0 sleep 10000
Options:
-I: Read input and sends to each ssh process.
-P: Tells p...
Vertically centering a div inside another div [duplicate]
...nner {
position: absolute;
top: 50%;
left: 50%;
width: 100px;
height: 100px;
-webkit-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
background: red;
}
<div class="cn">
<div class="inner">
test
<...
Is Big O(logn) log base e?
... @Kinopiko: OK. I think we are saying the same thing. I would say O(100) = O(1) because O(100) = O(100 * 1) = O(C * 1) = O(1). Which is what I meant by constant expressions being superfluous. That is, the order of any constant is 1.
– Daniel Pryden
Oct...
Custom thread pool in Java 8 parallel stream
...parallelism", "20");
s.parallel().forEach(i -> {
try { Thread.sleep(100); } catch (Exception ignore) {}
System.out.print((System.currentTimeMillis() - start) + " ");
});
The output is:
215 216 216 216 216 216 216 216 315 316 316 316 316 316 316 316 415 416 416 416
So you can see t...
When should I use Struct vs. OpenStruct?
...
Other benchmark:
require 'benchmark'
require 'ostruct'
REP = 100000
User = Struct.new(:name, :age)
USER = "User".freeze
AGE = 21
HASH = {:name => USER, :age => AGE}.freeze
Benchmark.bm 20 do |x|
x.report 'OpenStruct slow' do
REP.times do |index|
OpenStruct.new(:na...
Short description of the scoping rules?
...scope:
from __future__ import print_function # for python 2 support
x = 100
print("1. Global x:", x)
class Test(object):
y = x
print("2. Enclosed y:", y)
x = x + 1
print("3. Enclosed x:", x)
def method(self):
print("4. Enclosed self.x", self.x)
print("5. Globa...
css z-index lost after webkit transform translate3d
...50px);
}
#element_b {
-webkit-transform: translate3d(0, 0, 100px);
}
#element_a:hover {
-webkit-transform: translate3d(100px, 0, 60px);
}
#element_b:hover {
-webkit-transform: translate3d(-100px, 0, -60px);
}
</style>
<body>
<d...
How to print colored text in Python?
... windows (provided you use ANSICON, or in Windows 10 provided you enable VT100 emulation). There are ansi codes for setting the color, moving the cursor, and more.
If you are going to get complicated with this (and it sounds like you are if you are writing a game), you should look into the "curses"...
How can I clone an SQL Server database on the same server in SQL Server 2008 Express?
..._log nvarchar(50);
DECLARE @destDb nvarchar(50);
DECLARE @destMdf nvarchar(100);
DECLARE @destLdf nvarchar(100);
DECLARE @sqlServerDbFolder nvarchar(100);
SET @sourceDb = 'db1'
SET @sourceDb_log = @sourceDb + '_log'
SET @backupPath = 'E:\tmp\' + sourceDb + '.bak' --ATTENTION: file must already exis...
Perform debounce in React.js
... super(props);
this.method = debounce(this.method.bind(this),1000);
}
method() { ... }
}
ES5
var SearchBox = React.createClass({
method: function() {...},
componentWillMount: function() {
this.method = debounce(this.method.bind(this),100);
},
});
See JsF...