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How to install a specific version of a ruby gem?
...sudo to work with RVM gems. When you do
sudo you are running commands as root, another user in another shell
and hence all of the setup that RVM has done for you is ignored while
the command runs under sudo (such things as GEM_HOME, etc...). So to
reiterate, as soon as you 'sudo' you are run...
How to access component methods from “outside” in ReactJS?
...the component instance. You can pass a ref callback in when rendering the root of the component to get the instance, like so:
// React code (jsx)
function MyWidget(el, refCb) {
ReactDOM.render(<MyComponent ref={refCb} />, el);
}
export default MyWidget;
and:
// vanilla javascript code...
super() raises “TypeError: must be type, not classobj” for new-style class
...
super() can be used only in the new-style classes, which means the root class needs to inherit from the 'object' class.
For example, the top class need to be like this:
class SomeClass(object):
def __init__(self):
....
not
class SomeClass():
def __init__(self):
....
What is the difference between JOIN and UNION?
... subsets it -- completely different operations. Trivial example of UNION:
mysql> SELECT 23 AS bah
-> UNION
-> SELECT 45 AS bah;
+-----+
| bah |
+-----+
| 23 |
| 45 |
+-----+
2 rows in set (0.00 sec)
similary trivial example of JOIN:
mysql> SELECT * FROM
-> (SELECT...
Git Push ERROR: Repository not found
...
The .git/ directory can be found on the project's root directory.
– Gui Imamura
Aug 5 '15 at 19:28
...
马云：互联网时代已经过去20年，接下来30年才是关键 - 资讯 - 清泛网 - 专...
...正的机会。所谓现在提出互联网+，还有一个就是互联网如何变成一种应用。未来的时代，更多的靠知识，更多靠的是你的勇气，更多靠你的坚韧不拔去努力。所以我觉得，未来的30年，我们这些人，肯定不行了，那时候我是后来...
What is CMake equivalent of 'configure --prefix=DIR && make all install '?
...that wouldn't do. DESTDIR worked like a charm for getting things into buildroot.
– Mr Redstoner
Feb 11 at 11:45
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sendmail: how to configure sendmail on ubuntu? [closed]
...t the following, matching up to your smtp server:
AuthInfo:your.isp.net "U:root" "I:user" "P:password"
#Generate the Authentication database, make both files readable only by root
makemap hash client-info < client-info
chmod 600 client-info
cd ..
Add the following lines to sendmail.mc, but bef...
Do I need to create indexes on foreign keys on Oracle?
...int creates also an index... i.e. Jet Engine (MSAccess files, Firebird and MySQL)
– bubi
Apr 23 '15 at 15:19
17
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Command not found when using sudo
...un a command using sudo you are effectively running it as the superuser or root.
The reason that the root user is not finding your command is likely that the PATH environment variable for root does not include the directory where foo.sh is located. Hence the command is not found.
The PATH enviro...