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How do I migrate an SVN repository with history to a new Git repository?
I read the Git manual, FAQ, Git - SVN crash course, etc. and they all explain this and that, but nowhere can you find a simple instruction like:
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How to 'grep' a continuous stream?
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I use the tail -f <file> | grep <pattern> all the time.
It will wait till grep flushes, not till it finishes (I'm using Ubuntu).
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How to use sed to replace only the first occurrence in a file?
...lude directive before any existing #includes. For this sort of task, I normally use a small bash script with sed to re-write the file.
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Why dict.get(key) instead of dict[key]?
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It allows you to provide a default value if the key is missing:
dictionary.get("bogus", default_value)
returns default_value (whatever you choose it to be), whereas
dictionary["bogus"]
would raise a KeyError.
If omitted...
Intersection of two lists in Bash
... comm requires the inputs to be sorted. In this case, ls automatically sorts its output, but other uses may need to do this: comm -12 <(some-command | sort) <(some-other-command | sort)
– Alexander Bird
Jan 15 '15 at 21:11
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How can I explicitly free memory in Python?
...do its job. That said, if the OP is in a situation where he is suddenly deallocating a lot of objects (like in the millions), gc.collect may prove useful.
– Jason Baker
Aug 22 '09 at 19:53
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How to find corresponding log files folder for a web site?
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Ok, I've found this property - it's called "site id" and resides in "Advanced Properties" of the website.
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Command line progress bar in Java
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edited Nov 17 '11 at 10:48
KARASZI István
27.9k77 gold badges8989 silver badges114114 bronze badges
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Checking network connection
...t have a working internet connection, the DNS lookup itself may block the call to urllib_request.urlopen for more than a second. Thanks to @rzetterberg for pointing this out.
If the fixed IP address above is not working, you can find a current IP address for google.com (on unix) by running
% dig...
Difference between string and char[] types in C++
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A char array is just that - an array of characters:
If allocated on the stack (like in your example), it will always occupy eg. 256 bytes no matter how long the text it contains is
If allocated on the heap (using malloc() or new char[]) you're responsible for releasing the memory...