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How to modify a text file?

I'm using Python, and would like to insert a string into a text file without deleting or copying the file. How can I do that? ...
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Is non-blocking I/O really faster than multi-threaded blocking I/O? How?

I searched the web on some technical details about blocking I/O and non blocking I/O and I found several people stating that non-blocking I/O would be faster than blocking I/O. For example in this document . ...
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What is the difference between “JPG” / “JPEG” / “PNG” / “BMP” / “GIF” / “TIFF” Image?

...ow demonstrate the noticeable artifacting of lossy compression algorithms; select the thumbnail image to view the full size version. Each format is different as described below: JPEG JPEG (Joint Photographic Experts Group) files are (in most cases) a lossy format; the DOS filename extension is JPG...
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Command to get time in milliseconds

Is there a shell command in Linux to get the time in milliseconds? 12 Answers 12 ...
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sed command with -i option (in-place editing) works fine on Ubuntu but not Mac [duplicate]

I know nothing about Sed but need this command (which works fine on Ubuntu) to work on a Mac OSX: 4 Answers ...
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How dangerous is it to access an array out of bounds?

...? It can sometimes happen that I read from outside the array (I now understand I then access memory used by some other parts of my program or even beyond that) or I am trying to set a value to an index outside of the array. The program sometimes crashes, but sometimes just runs, only giving unexpect...
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Stop caching for PHP 5.5.3 in MAMP

...tions. Here are my notes on how each solution works and considerations for selecting a solution. Each solution works on its own; no need for redundancy. Webpage code solution opcache_reset(); <?php opcache_reset(); ?> Must be added in the webpage code. Forces all scripts to be reloaded. Wor...
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Is there a real solution to debug cordova apps [closed]

...5.In Safari’s menu, go to Develop and, look for your device’s name. 6.Select the tab you want to debug. share | improve this answer | follow | ...
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How do I programmatically change file permissions?

... selecting this one as I don't have the ability to use Marty Lamb's answer. – Roy Rico Mar 20 '09 at 0:44 ...
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How do I get the current username in Windows PowerShell?

...g the PowerShell instance) $(Get-WMIObject -class Win32_ComputerSystem | select username).username -- @TwonOfAn on this other forum Comparison @Kevin Panko's comment on @Mark Seemann's answer deals with choosing one of the categories over the other: [The Windows access token approach] is ...