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Check if a method exists
...j respondsToSelector:@selector(methodName:withEtc:)]) {
[obj methodName:123 withEtc:456];
}
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write a shell script to ssh to a remote machine and execute commands
... -S apt-get install vlc"
HOSTS=("192.168.1.121" "192.168.1.122" "192.168.1.123")
USERNAMES=("username1" "username2" "username3")
PASSWORDS=("password1" "password2" "password3")
for i in ${!HOSTS[*]} ; do
echo ${HOSTS[i]}
SCR=${SCRIPT/PASSWORD/${PASSWORDS[i]}}
sshpass -p ${PASSWORDS[i]...
How to linebreak an svg text within javascript?
...to simulate actual lines of text. For example:
<g transform="translate(123 456)"><!-- replace with your target upper left corner coordinates -->
<text x="0" y="0">
<tspan x="0" dy="1.2em">very long text</tspan>
<tspan x="0" dy="1.2em">I would like to li...
Adding Python Path on Windows 7
...out and back in after setting the Path variable.
– dk123
Nov 5 '13 at 2:34
Suffering a similar problem, had done every...
How do you install ssh-copy-id on a Mac?
...to compiling dependencies errors at ssl.
cat ~/.ssh/id_rsa.pub | ssh user@123.45.56.78 "mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys"
credit goes to this site
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总结const_cast、static_cast、dynamic_cast、reinterpret_cast - C/C++ - ...
...至它即便不是一个CDerived你也可以这样做。
当然，这个问题只在如果你做了多继承时发生。在你将CDerived转换 到 CBaseX时static_cast<> 和 reinterpret_cast<>是没有区别的。
情况3：void*之间的向前和向后转换
因为任何指针可以被转...
How to use a variable to specify column name in ggplot
... whoever heard of ensym() before? BIG SIGH
– CoderGuy123
Jun 4 '19 at 14:37
...
How do you remove a specific revision in the git history?
...
123
Here is a way to remove non-interactively a specific <commit-id>, knowing only the <c...
Can I store images in MySQL [duplicate]
...ation. I want it that for each image, there should be a thumb created with PHP (which is not that difficult). I want to save the thumbs (since they are very small) in the database and I use MySQL. (I don't want to save the thumbs as physical files on the drive.)
Does MySQL allow saving and retriev...
Why did my Git repo enter a detached HEAD state?
...
123
I reproduced this just now by accident:
lists the remote branches
git branch -r
origi...