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程序员之网络安全系列（一）：为什么要关注网络安全？ - 更多技术 - 清泛网...
...识，保护用户数据，同时防止自己被骗，对那些安全性不高的网站尽量不要使用，对那些安全不高的系统尽量不使用。
作为一个多年的程序员，我对网络安全相关的知识也非常少，我知道一些常规的东西，比如敏感数据加密存...
STL中map容器使用自定义key类型报错详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...定义该运算符或到预定义运算符可接收的类型的转换
定位错误
定位到第一个错误行的代码位置：f:\vs2008\vc\include\functional(143) :143行代码：
// TEMPLATE STRUCT less
emplate<class _Ty>
struct less
: public binary_function<_Ty, _Ty, bool>
{ // ...
What specifically are wall-clock-time, user-cpu-time, and system-cpu-time in UNIX?
...what you think. System calls, which include I/O calls such as read, write, etc. are executed by jumping into kernel code and executing that.
If wall clock time < CPU time, then you're executing a program in parallel. If wall clock time > CPU time, you're waiting for disk, network or other dev...
I forgot the password I entered during postgres installation
...te the postgres user's password
alter user postgres with password 'secure-passwd-here';
Edit the file /etc/postgresql/<version>/main/pg_hba.conf and change trust back to md5 and save the file
Reload the postgresql service
$ sudo service postgresql reload
Verify that the password change is...
How to pass the value of a variable to the stdin of a command?
...
(cat <<END
$passwd
END
) | command
The cat is not really needed, but it helps to structure the code better and allows you to use more commands in parentheses as input to your command.
...
How to run the sftp command with a password from Bash script?
... your file:
#!/bin/sh
HOST=<yourhostname>
USER=<someusername>
PASSWD=<yourpasswd>
cd <base directory for your put file>
lftp<<END_SCRIPT
open sftp://$HOST
user $USER $PASSWD
put local-file.name
bye
END_SCRIPT
And write/quit the vi editor after you edit the host, us...
Linux日志切分工具：Logrotate - 更多技术 - 清泛网 - 专注C/C++及内核技术
...似的还有Verbose选项，这里就不多说了。
Logrotate的疑问
问题：sharedscripts的作用是什么？
大家可能注意到了，我在前面Nginx的例子里声明日志文件的时候用了星号通配符，也就是说这里可能涉及多个日志文件，比如：access.log和e...
What are the differences between the threading and multiprocessing modules?
...o run a huge number of processes or to create and destroy them frequently, etc. But the GIL weighs heavily on the balance toward processes, in a way that isn't true for, say, C or Java. So, you will find yourself using multiprocessing a lot more often in Python than you would in C or Java.
Meanwh...
How to check if a symlink exists
...n't exist"
fi
the result of above is like:
root@linux:~# ./sym.sh /etc/passwd
you entry is not symlink
root@linux:~# ./sym.sh /usr/mda
your entry is symlink
root@linux:~# ./sym.sh
=> File doesn't exist
share
...
What does multicore assembly language look like?
...ng "load the EDX register with the value 5", "increment the EDX" register, etc.
10 Answers
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