大约有 43,000 项符合查询结果（耗时：0.0306秒） [XML]
find: missing argument to -exec
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I really confused. find /etc/nginx -name '*.conf' -exec echo {} ; and find /etc/nginx -name '*.conf' -exec echo {}\; gave the same result. :(
– Kirby
Mar 14 '16 at 22:19
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Difference between OData and REST web services
...methods, URL conventions, media types,
payload formats and query options etc. OData also guides you about
tracking changes, defining functions/actions for reusable procedures
and sending asynchronous/batch requests etc. Additionally, OData
provides facility for extension to fulfil any custom...
Framework vs. Toolkit vs. Library [duplicate]
...the task of the client code, such as building a window, resizing a window, etc. The lower levels of abstraction within a toolkit are either fixed, or can themselves be operated on by client code in a proscribed manner. (Think Window style, which can either be fixed, or which could be altered in adva...
What XML parser should I use in C++? [closed]
... are guaranteed to use the "basic subset" of XML: no namespaces, entities, etc.
So what does matter to you? The next question is: What is the most important thing to you in your XML work?
Maximum XML Parsing Performance
Your application needs to take XML and turn it into C++ datastructures as fast a...
Pass a data.frame column name to a function
...1(df, "B")
fun1(df, c("B","A"))
There's no need to use substitute, eval, etc.
You can even pass the desired function as a parameter:
fun1 <- function(x, column, fn) {
fn(x[,column])
}
fun1(df, "B", max)
Alternatively, using [[ also works for selecting a single column at a time:
df <- ...
T-SQL CASE Clause: How to specify WHEN NULL
... for null, and can be verified even in SQL Server by using case statements etc.)
SELECT NULL = NULL -- Results in NULL
SELECT NULL <> NULL -- Results in NULL
So there is no true/false answer to the question, instead the answer is also null.
This has many implications, for example in
CAS...
Making git auto-commit
...e is what I am using on Debian to track all changes to my calendar file:
/etc/rc.local:
su -c /home/<username>/bin/gitwait -l <username>
/home/<username>/bin/gitwait:
#!/bin/bash
#
# gitwait - watch file and git commit all changes as they happen
#
while true; do
inotify...
How can I combine two HashMap objects containing the same types?
...od can be more generic, use varargs and loop to putAll Maps from arguments etc. but I wanted to show a concept.
Also, ImmutableMap and its Builder have few limitations (or maybe features?):
they are null hostile (throw NullPointerException - if any key or value in map is null)
Builder don't accep...
JPA eager fetch does not join
What exactly does JPA's fetch strategy control? I can't detect any difference between eager and lazy. In both cases JPA/Hibernate does not automatically join many-to-one relationships.
...
Difference between encoding and encryption
...eeded to decipher the data, not the actual scheme/algorithms (e.g. RSA, DH etc).
– PragmaticProgrammer
Jan 17 at 18:39
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