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Difference between \n and \r?
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To complete,
In a shell (bash) script, you can use \r to send cursor, in front on line and, of course \n to put cursor on a new line.
For example, try :
echo -en "AA--AA" ; echo -en "BB" ; echo -en "\rBB"
The first "echo" display AA--AA
The second : A...
How to import a .cer certificate into a java keystore?
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Here's a script I used to batch import a bunch of crt files in the current directory into the java keystore. Just save this to the same folder as your certificate, and run it like so:
./import_all_certs.sh
import_all_certs.sh
KEYS...
Using generic std::function objects with member functions in one class
...he class instance. If you are creating a binding system for reflection or scripting, you will not want to do that. This alternative method is valid and relevant for some people.
– Greg
Nov 3 '16 at 23:06
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Utilizing multi core for tar+gzip/bzip compression/decompression
...n and vice versa.
p7zip
For p7zip for compression you need a small shell script like the following:
#!/bin/sh
case $1 in
-d) 7za -txz -si -so e;;
*) 7za -txz -si -so a .;;
esac 2>/dev/null
Save it as 7zhelper.sh. Here the example of usage:
$ tar -I 7zhelper.sh -cf OUTPUT_FILE.tar.7z pa...
How can I count the occurrences of a list item?
...at Counter is faster by a constant factor of approximately 2.
Here is the script I used:
from __future__ import print_function
import timeit
t1=timeit.Timer('Counter(l)', \
'import random;import string;from collections import Counter;n=1000;l=[random.choice(string.ascii_letters) f...
Check if a user has scrolled to the bottom
...as per the documentation from MDN, the simplest way is by using native javascript properties:
element.scrollHeight - element.scrollTop === element.clientHeight
Returns true when you're at the bottom of any scrollable element. So simply using javascript:
element.addEventListener('scroll', functio...
How to return only the Date from a SQL Server DateTime datatype
...sequent queries, so throw out execution #1 if you like.
Here is full test script and performance results that prove DateDiff is substantially faster than converting to varchar.
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How to run Gulp tasks sequentially one after the other
...g. return gulp.src('app/**/*.js').pipe(concat(app.js)).pipe(gulp.dest('app/scripts');, the key is to identify task one as a dependent when defining task two: gulp.task('two', ['one'], function() {... Task two will now wait for task one to end before running.
– esvendsen
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What are the most common SQL anti-patterns? [closed]
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My favorite is when people embed HTML AND javascript, e.g. SELECT '<a href=... onclick="">' + name ' </a>'
– Matt Rogish
Jan 14 '09 at 17:19
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Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array
I need to check a JavaScript array to see if there are any duplicate values. What's the easiest way to do this? I just need to find what the duplicated values are - I don't actually need their indexes or how many times they are duplicated.
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