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Hook up Raspberry Pi via Ethernet to laptop without router? [closed]
... potentially recover the Raspberry Pi, it will most likely be in a rural location and I'd like to turn off the Pi at that point safely.
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What is the difference between exit(0) and exit(1) in C?
... is the difference between exit(0) and exit(1) in C language?
exit(0) indicates successful program termination & it is fully portable, While
exit(1) (usually) indicates unsucessful termination. However, it's usage is non-portable.
Note that the C standard defines EXIT_SUCCESS and EXIT_FAILURE ...
Abort makefile if variable not set
... exists in the root
# directory, e.g. left by an accidental `make -t` invocation.
.PHONY : __check_defined_FORCE
__check_defined_FORCE :
Usage:
foo :|check-defined-BAR
Notice that the check-defined-BAR is listed as the order-only (|...) prerequisite.
Pros:
(arguably) a more clean syntax
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What does 'predicate' mean in the context of computer science? [duplicate]
...cifically I've seen it used in the context of text filtering. As if "predicate" == "filter criteria".
7 Answers
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Why are Perl 5's function prototypes bad?
...ar context returns the final element of the list. Your second-to-last invocation of foo() prints 2 because that is the final element in your two element slice. Change to my @array = qw(foo bar baz) and you'll see the difference. (As an aside, this is why I don't initialize arrays/lists to 0- or 1...
Is git's semi-secret empty tree object reliable, and why is there not a symbolic name for it?
..., the empty tree SHA1.
git log --pretty=raw
commit 9ed4ff9ac204f20f826ddacc3f85ef7186d6cc14
tree 4b825dc642cb6eb9a060e54bf8d69288fbee4904 <====
author VonC <vonc@laposte.net> 1381232247 +0200
committer VonC <vonc@laposte.net> 1381232247 +0200
initial empty commit
To show...
How to print matched regex pattern using awk?
...s situation. Example (replace line with matched group "yyy" from line):
$ cat testfile
xxx yyy zzz
yyy xxx zzz
$ cat testfile | sed -r 's#^.*(yyy).*$#\1#g'
yyy
yyy
Relevant manual page: https://www.gnu.org/software/sed/manual/sed.html#Back_002dreferences-and-Subexpressions
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How to pass the password to su/sudo/ssh without overriding the TTY?
... showing up in process list or log files by putting it in a file and using cat; 'cat pw | sudo -S <command>, and later rm pw.
– CAB
Mar 24 '16 at 16:43
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Java 理论与实践: 线程池与工作队列 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...到达服务器，这种方式可能是通过网络协议（例如 HTTP、FTP 或 POP）、通过 JMS 队列或者可能通过轮询数据库。不管请求如何到达，服务器应用程序中经常出现的情况是：单个任务处理的时间很短而请求的数目却是巨大的。
构建...
Recommended way to get hostname in Java
... resolve to several IP Addresses. And not all of those addresses must be located on the same computer! (Usecase: A simple form of load-balancing)
Let's not even start talking about dynamic IP addresses.
Also don't confuse the name of an IP-address with the name of the host (hostname). A metaphor mi...