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Difference between int[] array and int array[]
...
They are semantically identical. The int array[] syntax was only added to help C programmers get used to java.
int[] array is much preferable, and less confusing.
sh...
Regular expression to match DNS hostname or IP Address?
...o be escaped with \.
ValidHostnameRegex is valid as per RFC 1123. Originally, RFC 952 specified that hostname segments could not start with a digit.
http://en.wikipedia.org/wiki/Hostname
The original specification of
hostnames in RFC
952,
mandated that labels could not start
with a d...
360安全检测到18%后提示失败，关闭云盾、设置白名单解决 - 更多技术 - 清泛...
360安全检测到18%后提示失败，关闭云盾、设置白名单解决使用的是阿里云服务器，而服务器开启的云盾有DDos防护功能，把360检测当做DDos攻击拦截了。我们首先想到临时关闭云盾功能，不过笔者找了好...使用的是阿里云服务器，...
C#定点任务代码 类似Windows计划任务（健壮性高） - 更多技术 - 清泛网 - ...
C#定点任务代码 类似Windows计划任务（健壮性高）CSharp_Plan_TaskC#只提供Timer定时器，若要实现类似Windows计划任务的那种每日定点任务该如何实现呢？本文将详细介绍如何利用Timer实现定点任务。本文中代码为Demo版，原代码经过了...
C#定点任务代码 类似Windows计划任务（健壮性高） - 更多技术 - 清泛网移动...
C#定点任务代码 类似Windows计划任务（健壮性高）CSharp_Plan_TaskC#只提供Timer定时器，若要实现类似Windows计划任务的那种每日定点任务该如何实现呢？本文将详细介绍如何利用Timer实现定点任务。本文中代码为Demo版，原代码经过了...
C#定点任务代码 类似Windows计划任务（健壮性高） - 更多技术 - 清泛网 - ...
C#定点任务代码 类似Windows计划任务（健壮性高）CSharp_Plan_TaskC#只提供Timer定时器，若要实现类似Windows计划任务的那种每日定点任务该如何实现呢？本文将详细介绍如何利用Timer实现定点任务。本文中代码为Demo版，原代码经过了...
Quick-and-dirty way to ensure only one instance of a shell script is running at a time
... signal but just checks if a process with the given PID exists. Also the call to trap will ensure that the lockfile is removed even when your process is killed (except kill -9).
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What are the differences between LinearLayout, RelativeLayout, and AbsoluteLayout?
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LinearLayout means you can align views one by one (vertically/ horizontally).
RelativeLayout means based on relation of views from its parents and other views.
ConstraintLayout is similar to a RelativeLayout in that it uses relations to position and size widgets, but has addition...
Converting Secret Key into a String and Vice Versa
... throws InvalidParameterException {
try {
if (Cipher.getMaxAllowedKeyLength("AES") < keysize) {
// this may be an issue if unlimited crypto is not installed
throw new InvalidParameterException("Key size of " + keysize
+ " not supported i...
How to search contents of multiple pdf files?
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Your distribution should provide a utility called pdftotext:
find /path -name '*.pdf' -exec sh -c 'pdftotext "{}" - | grep --with-filename --label="{}" --color "your pattern"' \;
The "-" is necessary to have pdftotext output to stdout, not to files.
The --with-filen...