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Check if bash variable equals 0 [duplicate]
...and appears empty to bash. You can verify this using the below tests which all evaluate to true because xyz is either empty or unset:
if [ -z ] ; then echo "true"; else echo "false"; fi
xyz=""; if [ -z "$xyz" ] ; then echo "true"; else echo "false"; fi
unset xyz; if [ -z "$xyz" ] ; then echo "t...
UCenter实现各系统通信的原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...原理
1、用户登录bbs，通过logging.php文件中，使用函数uc_user_login验证，如果验证成功，将调用函数uc_user_synlogin（位于uc_client下的client.php文件中）， 在这个函数中调用 uc_api_post('user', 'synlogin', array('uid'=>$uid));之后向UC_API.'/index.php'...
How to properly add cross-site request forgery (CSRF) token using PHP
... deterministically
Try this out:
Generating a CSRF Token
PHP 7
session_start();
if (empty($_SESSION['token'])) {
$_SESSION['token'] = bin2hex(random_bytes(32));
}
$token = $_SESSION['token'];
Sidenote: One of my employer's open source projects is an initiative to backport random_bytes() a...
How do I handle the window close event in Tkinter?
...
Tkinter supports a mechanism called protocol handlers. Here, the term protocol refers to the interaction between the application and the window manager. The most commonly used protocol is called WM_DELETE_WINDOW, and is used to define what happens when th...
Get filename and path from URI from mediastore
... cursor.moveToFirst();
return cursor.getString(column_index);
} finally {
if (cursor != null) {
cursor.close();
}
}
}
share
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improve this answer
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f...
What is “export default” in javascript?
...he default export can be imported without using braces. This answer is actually pretty wrong as it says you can only use default when there is only one export in a file, which is not true at all. You can have several exports in the same file, but of course only 1 of them can be set as the default on...
Notification click: activity already open
...current task, then instead of launching a new instance of that
activity, all of the other activities on top of it will be closed and
this Intent will be delivered to the (now on top) old activity as a
new Intent.
For example, consider a task consisting of the activities: A, B, C, D.
If...
Failed to load c++ bson extension
...
I guess you did not have the make tools available when you installed your mongodb library. I suggest you do
xcode-select --install (on a mac)
or sudo apt-get install gcc make build-essential (on ubuntu)
and run
rm -rf node_modules
npm cache clean
npm install
OR just npm update bas...
How to upgrade PowerShell version from 2.0 to 3.0
...he OS that I am using is Windows 7, and the PowerShell version that is installed here is 2.0. Is it possible for me to upgrade it to version 3.0 or 4.0?
...
Define make variable at rule execution time
...r are evaluated. In order to create the directory only when out.tar is actually fired, you need to move the directory creation down into the steps:
out.tar :
$(eval TMP := $(shell mktemp -d))
@echo hi $(TMP)/hi.txt
tar -C $(TMP) cf $@ .
rm -rf $(TMP)
The eval function evaluates a...