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find: missing argument to -exec
...
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
...
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 <- ...
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...
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...
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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