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The way to check a HDFS directory's size?
...
Prior to 0.20.203, and officially deprecated in 2.6.0:
hadoop fs -dus [directory]
Since 0.20.203 (dead link) 1.0.4 and still compatible through 2.6.0:
hdfs dfs -du [-s] [-h] URI [URI …]
You can also run hadoop fs -help for more ...
Change the current directory from a Bash script
...adding this line:
# . ~/bin/myprog.sh
#
function myprog() {
A=$1
B=$2
echo "aaa ${A} bbb ${B} ccc"
cd /proc
}
The reason is that each process has its own current directory, and when you execute a program from the shell it is run in a new process. The standard "cd", "pushd" and "popd" ar...
Accessing inactive union member and undefined behavior?
...ough a union, whereas C++ (c++11) has no such permission.
c11
6.5.2.3 Structure and union members
95) If the member used to read the contents of a union object is not the same as the member last used to
store a value in the object, the appropriate part of the object representation of...
用户界面（UI）组件 · App Inventor 2 中文网
...如何水平对齐的数字，含义如下：
1 （左对齐）
2 （右对齐）
3 （水平居中）
垂直对齐
表示屏幕内容如何垂直对齐的数字，含义如下：
1 （顶部对齐）
2 （垂直居中）
3 （底部对齐）
如果屏幕可...
Bash if statement with multiple conditions throws an error
...
251
Use -a (for and) and -o (for or) operations.
tldp.org/LDP/Bash-Beginners-Guide/html/sect_07_0...
Replace only text inside a div using jquery
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edited Oct 29 '14 at 20:50
cuSK
7701010 silver badges2323 bronze badges
answered Aug 8 '1...
How can I listen for a click-and-hold in jQuery?
... clearTimeout(timeoutId);
});
Edit: correction per AndyE...thanks!
Edit 2: using bind now for two events with same handler per gnarf
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How to match a String against string literals in Rust?
... => println!("0"),
"b" => println!("1"),
"c" => println!("2"),
_ => println!("something else!"),
}
There's also an as_str method as of Rust 1.7.0:
match stringthing.as_str() {
"a" => println!("0"),
"b" => println!("1"),
"c" => println!("2"),
_ =>...
Assign pandas dataframe column dtypes
...ated in 0.17)
df = pd.DataFrame({'x': {0: 'a', 1: 'b'}, 'y': {0: '1', 1: '2'}, 'z': {0: '2018-05-01', 1: '2018-05-02'}})
df.dtypes
x object
y object
z object
dtype: object
df
x y z
0 a 1 2018-05-01
1 b 2 2018-05-02
You can apply these to each column you want to co...