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Test whether string is a valid integer
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[[ $var =~ ^-?[0-9]+$ ]]
The ^ indicates the beginning of the input pattern
The - is a literal "-"
The ? means "0 or 1 of the preceding (-)"
The + means "1 or more of the preceding ([0-9])"
The $ indicates the end of the input pattern
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App Inventor 2 Web客户端（Web）详细用法示例 · App Inventor 2 中文网
...网IP:8768/upload。
中途验证：电脑浏览器打开 http://127.0.0.1:8768/，看到 {"uploads": []}。
第 2 步：确认手机连得到电脑
查电脑的局域网 IP（Windows 运行 ipconfig 看「IPv4 地址」，macOS/Linux 运行 ifconfig 或 ip addr），例如 192.168.1.23。
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How do I break out of a loop in Scala?
...f loops.
Suppose you want to sum numbers until the total is greater than 1000. You try
var sum = 0
for (i <- 0 to 1000) sum += i
except you want to stop when (sum > 1000).
What to do? There are several options.
(1a) Use some construct that includes a conditional that you test.
var sum...
How are cookies passed in the HTTP protocol?
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302
The server sends the following in its response header to set a cookie field.
Set-Cookie:name=v...
jQuery How to Get Element's Margin and Padding?
...ry - I can get an elements formatted total padding and margin etc ? i.e. 30px 30px 30px 30px or 30px 5px 15px 30px etc
8 A...
Pip freeze vs. pip list
...ecific format for pip to understand, which is
feedparser==5.1.3
wsgiref==0.1.2
django==1.4.2
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That is the "requirements format".
Here, django==1.4.2 implies install django version 1.4.2 (even though the latest is 1.6.x).
If you do not specify ==1.4.2, the latest version available would be in...
How to escape braces (curly brackets) in a format string in .NET
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10 Answers
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Convert unix time to readable date in pandas dataframe
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230
These appear to be seconds since epoch.
In [20]: df = DataFrame(data['values'])
In [21]: df.co...
Alter MySQL table to add comments on columns
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answered Jan 29 '10 at 14:18
RufinusRufinus
23.5k66 gold badges5959 silver badges7878 bronze badges
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Passing route control with optional parameter after root in express?
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190
That would work depending on what client.get does when passed undefined as its first parameter.
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