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unix - head AND tail of file
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You can simply:
(head; tail) < file.txt
And if you need to uses pipes for some reason then like this:
cat file.txt | (head; tail)
Note: will print duplicated lines if number of lines in file.txt is smaller than default lines of head + default lines of tail.
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How do you clear a stringstream variable?
...nherited from ios and is used to clear the error state of the stream, e.g. if a file stream has the error state set to eofbit (end-of-file), then calling clear() will set the error state back to goodbit (no error).
For clearing the contents of a stringstream, using:
m.str("");
is correct, althou...
Save An Image To Application Documents Folder From UIView On IOS
...want to store these images in Core Data, since that can impact performance if the data set grows too large. Better to write the images to files.
NSData *pngData = UIImagePNGRepresentation(image);
This pulls out PNG data of the image you've captured. From here, you can write it to a file:
NSArray...
How do I clear/delete the current line in terminal?
If I'm using terminal and typing in a line of text for a command, is there a hotkey or any way to clear/delete that line?
1...
Calling startActivity() from outside of an Activity context
...nal flags to the intent (or with existing flags value).
EDIT
Be aware if you are using flags that you change the history stack as Alex Volovoy's answer says:
...avoid setting flags as it will interfere with normal flow of event and history stack.
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How to use a variable inside a regular expression?
...nterpolation, "f-strings". In your particular case the solution would be:
if re.search(rf"\b(?=\w){TEXTO}\b(?!\w)", subject, re.IGNORECASE):
...do something
EDIT:
Since there have been some questions in the comment on how to deal with special characters I'd like to extend my answer:
raw str...
How to run SQL script in MySQL?
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If you’re at the MySQL command line mysql> you have to declare the SQL file as source.
mysql> source \home\user\Desktop\test.sql;
share
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AngularJS Directive Restrict A vs E
...template. The
common case for this is when you are creating a Domain-Specific
Language for parts of your template. Use an attribute when you are
decorating an existing element with new functionality.
Edit following comment on pitfalls for a complete answer:
Assuming you're building an app t...
Converting a JS object to an array using jQuery
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If you are looking for a functional approach:
var obj = {1: 11, 2: 22};
var arr = Object.keys(obj).map(function (key) { return obj[key]; });
Results in:
[11, 22]
The same with an ES6 arrow function:
Object.keys(obj).ma...
How can I pass an argument to a PowerShell script?
...tement in your script
$iTunes = New-Object -ComObject iTunes.Application
if ($iTunes.playerstate -eq 1)
{
$iTunes.PlayerPosition = $iTunes.PlayerPosition + $step
}
Call it with
powershell.exe -file itunesForward.ps1 -step 15
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