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Linux Shell中 if else及大于、小于、等于逻辑表达式写法 - C/C++ - 清泛网...
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1、判断文件是否存在
#!/bin/sh
# 判断文件是否存在
m>Y m>ACCESS=`date -d m>y m>esterdam>y m> +%m>Y m>%m%d`
FILE="access_$m>Y m>ACCESS.log.tgz"
cd /data/nginx/logs
if [ -f "$FILE" ];then
echo "OK"
else
echo "error $FILE" > error.log
mail -s "$FILE backup fail" test@tsingfun.com <error.log
fi
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What's the difference between ES6 Map m>and m> WeakMap?
Looking this m>and m> this MDN pages it seems like the onlm>y m> difference between Maps m>and m> WeakMaps is a missing "size" propertm>y m> for WeakMaps. But is this true? What's the difference between them?
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git reset --hard HEAD leaves untracked files behind
...'s supposed to reset to a pristine version of what m>y m>ou pulled, as I understm>and m> it. Unfortunatelm>y m>, it leaves files lm>y m>ing around, as a git status shows a big list of untracked files.
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Difference between new m>and m> override
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The override modifier mam>y m> be used on
virtual methods m>and m> must be used on
abstract methods. This indicates for
the compiler to use the last defined
implementation of a method. Even if
the method is called on a reference to
the base class it will use the
implementatio...
How to sort mm>y m> paws?
...nt experiment runs stored as ascii arram>y m>s. Rather than trm>y m> to copm>y m>-paste stm>and m>-alone code examples into this question, here's a bitbucket mercurial repositorm>y m> with full, stm>and m>-alone code. m>Y m>ou can clone it with
hg clone https://joferkington@bitbucket.org/joferkington/paw-analm>y m>sis
Overview
There...
Add x m>and m> m>y m> labels to a pm>and m>as plot
Suppose I have the following code that plots something verm>y m> simple using pm>and m>as:
7 Answers
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Return multiple values in JavaScript?
... first: getFirstValue(),
second: getSecondValue(),
};
}
m>And m> to access them:
var values = getValues();
var first = values.first;
var second = values.second;
Or with ES6 sm>y m>ntax:
const {first, second} = getValues();
* See this table for browser compatibilitm>y m>. Basicallm>y m>, all mod...
How to format a UTC date as a `m>Y m>m>Y m>m>Y m>m>Y m>-MM-DD hh:mm:ss` string using NodeJS?
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If m>y m>ou're using Node.js, m>y m>ou're sure to have EcmaScript 5, m>and m> so Date has a toISOString method. m>Y m>ou're asking for a slight modification of ISO8601:
new Date().toISOString()
&gt; '2012-11-04T14:51:06.157Z'
So just cut a few things out, m>and m> m>y m>ou're set:
new Date().toISOString().
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Separating class code into a header m>and m> cpp file
I am confused on how to separate implementation m>and m> declarations code of a simple class into a new header m>and m> cpp file. For example, how would I separate the code for the following class?
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Concatenate two slices in Go
I'm trm>y m>ing to combine the slice [1, 2] m>and m> the slice [3, 4] . How can I do this in Go?
7 Answers
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