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Read a variable in bash with a default value
....
– Ricardo Marimon
Apr 15 '10 at 5:05
43
This doesn't actually answer the question. The default ...
psql: could not connect to server: No such file or directory (Mac OS X)
Upon restarting my Mac I got the dreaded Postgres error:
21 Answers
21
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Why is my program slow when looping over exactly 8192 elements?
...am in question. The matrix img[][] has the size SIZE×SIZE, and is initialized at:
2 Answers
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Behaviour of increment and decrement operators in Python
...d to be consistent and readable.
Confusing side-effects. One common newbie error in languages with ++ operators is mixing up the differences (both in precedence and in return value) between the pre- and post-increment/decrement operators, and Python likes to eliminate language "gotcha"-s. The preced...
Awk学习笔记 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...正则表达式
< <= > >= != ==
关系运算符
空格
连接
+ -
加，减
* / &
乘，除与求余
+ - !
一元加，减和逻辑非
^ ***
求幂
++ --
增加或减少，作为前缀或后缀
$
字段引用
in
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Difference between staticmethod and classmethod
... class rather than from a class instance. A.foo(1) would have raised a TypeError, but A.class_foo(1) works just fine:
A.class_foo(1)
# executing class_foo(<class '__main__.A'>,1)
One use people have found for class methods is to create inheritable alternative constructors.
With staticmet...
MISCONF Redis is configured to save RDB snapshots
During writes to Redis ( SET foo bar ) I am getting the following error:
31 Answers
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RVM is not a function, selecting rubies with 'rvm use …' will not work
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@AdityaPednekar So, sometimes reading the error/console message actually helps, RVM is not a function, selecting rubies with 'rvm use ...' will not work. You need to change your terminal emulator preferences to allow login shell. Sometimes it is required to use /b...
Emulating a do-while loop in Bash
... done.
– Alexej Magura
Feb 12 at 19:05
2
Never said anything different, only that true is not a b...
Setting UIButton image results in blue button in iOS 7
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In iOS7 there is new button type called UIButtonTypeSystem NS_ENUM_AVAILABLE_IOS(7_0), // standard system button
Check your .xib file and change button type to Custom
To do this programmatically, add this line to the viewDidLoad:
[UIButton buttonWithType:UIButtonTypeSystem];
...