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/etc/apt/sources.list" E212: Can't open file for writing
...rces.list using vi editor but getting the following error while saving the file:
12 Answers
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What should go into an .h file?
When dividing your code up into multiple files just what exactly should go into an .h file and what should go into a .cpp file?
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Using G++ to compile multiple .cpp and .h files
I've just inherited some C++ code that was written poorly with one cpp file which contained the main and a bunch of other functions. There are also .h files that contain classes and their function definitions.
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How to read lines of a file in Ruby
I was trying to use the following code to read lines from a file. But when reading a file , the contents are all in one line:
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How to get file creation & modification date/times in Python?
I have a script that needs to do some stuff based on file creation & modification dates but has to run on Linux & Windows .
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How to delete from a text file, all lines that contain a specific string?
How would I use sed to delete all lines in a text file that contain a specific string?
17 Answers
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How to create a subdirectory for a project QtCreator?
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One method you could use is to add a project include file for each sub directory.
Qt Creator displays these in the GUI in a nested fashion, and allows you to add files to them.
e.g.
in project.pro
include(folder1/include.pri)
in folder1/include.pri
HEADERS += MyClass.h
S...
How to jump to a particular line in a huge text file?
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The linecache module allows one to get any line from a Python source file, while attempting to optimize internally, using a cache, the common case where many lines are read from a single file. This is used by the traceback module to retrieve source lines for inclusion in the formatted tracebac...
How can I get a file's size in C++? [duplicate]
...mplementary question to this one .
What is the most common way to get the file size in C++?
Before answering, make sure it is portable (may be executed on Unix, Mac and Windows),
reliable, easy to understand and without library dependencies (no boost or qt, but for instance glib is ok since it is p...
git add only modified changes and ignore untracked files
I ran "git status" and listed below are some files that were modified/or under the heading "changes not staged for commit".
It also listed some untracked files that I want to ignore (I have a ".gitignore" file in these directories).
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