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How to select a single field for all documents in a MongoDB collection?
...e returned document will return only the roll field (and exclude the _id).
If we don't mention _id:0 the fields returned will be roll and _id. The '_id' field is always displayed by default. So we need to explicitly mention _id:0 along with roll.
...
Logstash实践: 分布式系统的日志监控 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的文本即可：
tail -f /data/log/logstash/all.log | awk '{
if (match($0, /.*(PHP Deprecated|PHP Notice|PHP Fatal error|PHP Warning|ERROR|WARN).*/)) { print "\033[41;37;1m"$0"\033[0m" }
else if (match($0, /.*关键信息1.*/)) { print "\033[32;1m"$0"\033[0m" }
else if (match($0, /...
How to paste in a new line with vim?
... solution unless you combined it with some keyboard map as suggested in a different answer. For instance, you can map it to any key (even p):
:nmap p :pu<CR>
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Rails server says port already used, how to kill that process?
...
Just to clarify for novices: in the second line of code, you are supposed to replace the PID with the actual number that is shown in your console upon entering the first line of code (eg, 12345).
– CodeBiker
...
How can I list all tags in my Git repository by the date they were created?
...o list all tags in my system by the date they were created but am not sure if I can get that data via git-log. Ideas?
9 Ans...
How to randomize (or permute) a dataframe rowwise and columnwise?
... Well, this is changing order of rows and columns, but what OP wanted is different: shuffle each column/row independently
– JelenaČuklina
Feb 2 '16 at 10:51
...
Timing a command's execution in PowerShell
... [switch]$quiet = $false
)
$start = Get-Date
try {
if ( -not $quiet ) {
iex $command | Write-Host
} else {
iex $command > $null
}
} finally {
$(Get-Date) - $start
}
}
Source: https://gist.github.com/bender-the-great...
Inspect element that only appear when other element is mouse overed/entered
...n
Press F8 to freeze the page
Switch to the Elements panel and use the magnifying glass icon in the top left to select the tooltip
If the tooltip shows up because of CSS, here's what you can do in that case:
Step-by-step:
Open the DevTools
Select the triggering element in the dev tools (the li...
Counting the number of elements with the values of x in a vector
...bset it:
> a[names(a)==435]
435
3
Or convert it into a data.frame if you're more comfortable working with that:
> as.data.frame(table(numbers))
numbers Freq
1 4 2
2 5 1
3 23 2
4 34 2
...
...
Entity framework linq query Include() multiple children entities
....CompleteCompanies().FirstOrDefault(c => c.Id == companyID);
//or if you want even more
Company company =
context.CompanyById(companyID);
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