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What are the precise rules for when you can omit parenthesis, dots, braces, = (functions), etc.?
...can omit dot when using the prefix, infix and postfix notations -- the so called operator notation. While using the operator notation, and only then, you can omit the parenthesis if there is less than two parameters passed to the method.
Now, the operator notation is a notation for method-call, whi...
How do I turn off Oracle password expiration?
...ble substitutions.
SET VERIFY ON
SHOW VERIFY
REM Tell SQL*Plus to use the ampersand '&' to indicate variables in substitution/expansion.
SET DEFINE '&'
SHOW DEFINE
REM Specify in a SQL*Plus variable the account to 'reset'.
REM Note that user names are case sensitive in recent versions of O...
Postfix日常维护队列管理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...删除。
例如id是0EAF3A9B 那么postsuper -d 0EAF3A9B
postsuper -d ALL 删除所有邮件
显示信件列表：postqueue -p
显示信件內容：postcat -q Queue_ID
刪除各別信件：postsuper -d Queue_ID
全部刪除：postsuper -d ALL
扣住信件：postsuper -h Queue_ID
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Convert data.frame columns from factors to characters
I have a data frame. Let's call him bob :
18 Answers
18
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Iterating over each line of ls -l output
... instead of parsing output of "ls -l" line by line, you could iterate over all files and do an "ls -l" for each individual file like this:
for x in * ; do echo `ls -ld $x` ; done
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In Flux architecture, how do you manage Store lifecycle?
I'm reading about Flux but the example Todo app is too simplistic for me to understand some key points.
3 Answers
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What is “406-Not Acceptable Response” in HTTP?
...turned by the service"? How might I check this? I am returning json from a php file so Im presuming the content type will be json (or do i need to specify this in the headers of the php file?) also I provided this content type in my request header like so 'Accept':'application/json'. would this be c...
How to find out if an item is present in a std::vector?
...d()
This returns a bool (true if present, false otherwise). With your example:
#include <algorithm>
#include <vector>
if ( std::find(vec.begin(), vec.end(), item) != vec.end() )
do_this();
else
do_that();
...
How to grep (search) committed code in the Git history
...s and the like), you need to do:
git grep <regexp> $(git rev-list --all)
git rev-list --all | xargs git grep <expression> will work if you run into an "Argument list too long" error.
If you want to limit the search to some subtree (for instance, "lib/util"), you will need to pass tha...
What is the meaning of polyfills in HTML5?
...ce and example of polyfill here:
http://www.programmerinterview.com/index.php/html5/html5-polyfill/
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