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How to use sed to replace only the first occurrence in a file?
...the 0 with a 1, so: sed '1,/RE/s//to_that/' file
– mhost
Oct 5 '14 at 1:24
13
Could somebody plea...
What does if __name__ == “__main__”: do?
...ightly different code sample to explore how imports and scripts work. Suppose the following is in a file called foo.py.
# Suppose this is foo.py.
print("before import")
import math
print("before functionA")
def functionA():
print("Function A")
print("before functionB")
def functionB():
p...
Purpose of #!/usr/bin/python3
...t the shebang line.
You can use #!/usr/bin/env python3 for portability across different systems in case they have the language interpreter installed in different locations.
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How do I correctly clean up a Python object?
...esources that need to be cleaned up. The problem with using an explicit close() statement is that you have to worry about people forgetting to call it at all or forgetting to place it in a finally block to prevent a resource leak when an exception occurs.
To use the with statement, create a class ...
TCP: can two different sockets share a port?
...utbound connections to use a random client-side port, in which case it is possible to run out of available ports if you make a lot of connections in a short amount of time.
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How to use an existing database with an Android application [duplicate]
...ataBaseExist) {
this.getReadableDatabase();
this.close();
try {
// Copy the database from assests
copyDataBase();
Log.e(TAG, "createDatabase database created");
} catch (IOException mIOException) {
...
bundler vs RVM vs gems vs RubyGems vs gemsets vs system ruby [closed]
...f Ruby (it is itself packaged as a gem), but it a "de facto standard" for most applications (you will not find many people not using it, and no good reasons not to use it, actually).
RVM is a tool allowing you to install multiple versions of Ruby on a machine, switching between them when needed. Th...
What exactly does stringstream do?
...her numerical types. The usage of stringstream is similar to the usage of iostream, so it is not a burden to learn.
Stringstreams can be used to both read strings and write data into strings. It mainly functions with a string buffer, but without a real I/O channel.
The basic member functions of st...
The command rbenv install is missing
...ithub.com/rbenv/ruby-build.git "$(rbenv root)"/plugins/ruby-build
On Mac OS X you can install it through homebrew:
brew install ruby-build
On Debian (version >= 7) and Ubuntu (version >= 12.10) both rbenv and ruby-build can be installed using apt-get (or aptitude):
sudo apt-get update
su...
Use jQuery to get the file input's selected filename without the path
...MikeDeSimone I've tested split('\\').pop(); on Win 7, Ubuntu 11.04 and Mac OS X and it works fine on all of them.
– Alex
Mar 8 '12 at 14:57
3
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