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/etc/apt/sources.list" E212: Can't open file for writing
... of how to save those changes:
One time Setup demo to create a root owned read only file for a lower user:
sudo touch temp.txt
sudo chown root:root temp.txt
sudo chmod 775 temp.txt
whoami
el
First open the file as normal user:
vi temp.txt
Then make some changes to the file, it warns you its r...
jQuery selector regular expressions
... The answer below from nickf should be the accepted one. If you are reading this answer, be sure to read that one!
– Quentin Skousen
Sep 17 '14 at 19:58
5
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JavaScript ternary operator example with functions
... It's a great way to reduce four lines of code into one without impacting readability. The only word of advice I would give you is to avoid nesting multiple ternary statements on the same line (that way lies madness!)
shar...
How do I look inside a Python object?
...
First, read the source.
Second, use the dir() function.
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Simple basic explanation of a Distributed Hash Table (DHT)
...ing, and some claim to O(1)-hop routing at the cost of more maintenance.
Read the wikipedia page, and if you really want to know in a bit of depth, check out this coursepage at Harvard which has a pretty comprehensive reading list.
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How to calculate time elapsed in bash script?
...hus, you can just set SECONDS to 0 before starting the timed event, simply read SECONDS after the event, and do the time arithmetic before displaying.
SECONDS=0
# do some work
duration=$SECONDS
echo "$(($duration / 60)) minutes and $(($duration % 60)) seconds elapsed."
As this solution doesn't de...
Is there an advantage to use a Synchronized Method instead of a Synchronized Block?
... that the method synchronizes on the object instance and is (presumably) thread-safe.
– Scrubbie
Mar 14 '12 at 18:08
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What exactly does stringstream do?
...stream, 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 stringstream class are
str(), which returns the contents of its buffer in s...
Hidden Features of SQL Server
... extras:
MultipleActiveResultSets=true;
This makes ADO.Net 2.0 and above read multiple, forward-only, read-only results sets on a single database connection, which can improve performance if you're doing a lot of reading. You can turn it on even if you're doing a mix of query types.
Application N...
Dealing with commas in a CSV file
...aid, you need to escape values that include quotes. Here’s a little CSV reader in C♯ that supports quoted values, including embedded quotes and carriage returns.
By the way, this is unit-tested code. I’m posting it now because this question seems to come up a lot and others may not want an ...