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How can I use a file in a command and redirect output to the same file without truncating it?
...y the time grep looks at file_name, it is already empty. You can use a temporary file though.
#!/bin/sh
tmpfile=$(mktemp)
grep -v 'seg[0-9]\{1,\}\.[0-9]\{1\}' file_name > ${tmpfile}
cat ${tmpfile} > file_name
rm -f ${tmpfile}
like that, consider using mktemp to create the tmpfile but note t...
Implementing slicing in __getitem__
I am trying to implement slice functionality for a class I am making that creates a vector representation.
5 Answers
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How can I detect if a browser is blocking a popup?
...sionally, I've come across a webpage that tries to pop open a new window (for user input, or something important), but the popup blocker prevents this from happening.
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Upgrading PHP in XAMPP for Windows?
I would like to know how you upgrade PHP in Xampp for Windows? I tried to download the latest PHP version from the main PHP site but when I check (phpinfo) I still get that the previous version is still in use.
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Why no generics in Go?
Disclaimer: I've only played with Go for one day now, so there's a good chance I've missed a lot.
6 Answers
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Determine if 2 lists have the same elements, regardless of order? [duplicate]
Sorry for the simple question, but I'm having a hard time finding the answer.
4 Answers
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Java: Calling a super method which calls an overridden method
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The keyword super doesn't "stick". Every method call is handled individually, so even if you got to SuperClass.method1() by calling super, that doesn't influence any other method call that you might make in the future.
That means th...
How to place two divs next to each other?
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Float one or both inner divs.
Floating one div:
#wrapper {
width: 500px;
border: 1px solid black;
overflow: hidden; /* will contain if #first is longer than #second */
}
#first {
width: 300px;
float:left; /* add t...
What is the difference between `after_create` and `after_save` and when to use which?
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after_create only works once - just after the record is first created.
after_save works every time you save the object - even if you're just updating it many years later
So if you want to do this email operation only just the once (and then n...
Python Mocking a function from an imported module
I want to understand how to @patch a function from an imported module.
2 Answers
2
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