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How do I test if a variable is a number in Bash?
I just can't figure out how do I make sure an argument passed to my script is a number or not.
38 Answers
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Define a lambda expression that raises an Exception
... @ErlVolton Clever! Though using this anywhere except in a one-off script seems like a terrible idea...
– Kyle Strand
Oct 14 '14 at 16:01
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How to properly import a selfsigned certificate into Java keystore that is available to all Java app
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I ended up writing a small script that adds the certificates to the keystores, so it is much easier to use.
You can get the latest version from https://github.com/ssbarnea/keytool-trust
#!/bin/bash
# version 1.0
# https://github.com/ssbarnea/keytool-...
How many characters can UTF-8 encode?
...nes of Unicode, which include less common CJK characters, various historic scripts, mathematical symbols, and emoji (pictographic symbols).
source: Wikipedia
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How to edit incorrect commit message in Mercurial? [duplicate]
...ches isn't needed any, thus it can be removed via qfinish.
Following demo script shows all operations in action. In the example the commit message of third changeset is renamed.
# test.sh
cd $(dirname $0)
set -x -e -u
echo INFO: Delete old stuff
rm -rf .hg `seq 5`
echo INFO: Setu
Getting the first character of a string with $str[0]
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It'll vary depending on resources, but you could run the script bellow and see for yourself ;)
<?php
$tests = 100000;
for ($i = 0; $i < $tests; $i++)
{
$string = md5(rand());
$position = rand(0, 31);
$start1 = microtime(true);
$char1 = $string[$position];
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How to create Android Facebook Key Hash?
... the password in plain text when you input it. So you better write a small script that runs the commands separately.
– Pierre
Sep 15 '17 at 14:41
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mysqli or PDO - what are the pros and cons? [closed]
...y in an object. If you don't want to use an ORM (cause it's a just a quick script) but you do like object mapping, it's REALLY cool :
class Student {
public $id;
public $first_name;
public $last_name
public function getFullName() {
return $this->first_name.' '.$this->...
How do you rename a MongoDB database?
... renamed to db2 to achieve rename Database name.
you can do it in this Js script
var source = "source";
var dest = "dest";
var colls = db.getSiblingDB(source).getCollectionNames();
for (var i = 0; i < colls.length; i++) {
var from = source + "." + colls[i];
var to = dest + "." + colls[i];
db....
How to disable Google Chrome auto update?
...RE\Wow6432Node\Policies\Google\Update.
I created a GitHub gist powershell script to create the dwords under both Policies and Wow6432Node\Policies.
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