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What is the difference between PS1 and PROMPT_COMMAND
...ttp://www.gnu.org/software/bash/manual/bashref.html
PROMPT_COMMAND
If set, the value is interpreted as a command to execute before
the printing of each primary prompt ($PS1).
I never used it, but I could have used this back when I only had sh.
...
Makefile variable as prerequisite
In a Makefile, a deploy recipe needs a environment variable ENV to be set to properly execute itself, whereas others don't care, e.g.:
...
What's the difference between “squash” and “fixup” in Git/Git Extension?
...ve commit
# l, label <label> = label current HEAD with a name
# t, reset <label> = reset HEAD to a label
# m, merge [-C <commit> | -c <commit>] <label> [# <oneline>]
# . create a merge commit using the original merge commit's
# . message (or the onelin...
How can I quantify difference between two images?
...PIL library will help to do it in Python.
If they are taken with the same settings and the same device, they are probably the same.
Are images well-aligned?
If not, you may want to run cross-correlation first, to find the best alignment first. SciPy has functions to do it.
If the camera and the s...
Bash set +x without it being printed
Does anyone know if we can say set +x in bash without it being printed:
5 Answers
5
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Placeholder in UITextView
...w I want the UITextView to have a placeholder similar to the one you can set for an UITextField .
62 Answers
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ASP.NET MVC: No parameterless constructor defined for this object
...structor:
public class MyViewModel
{
public SelectList Contacts { get;set; }
}
You'll need to refactor your model to do it a different way if this is the cause. So using an IEnumerable<Contact> and writing an extension method that creates the drop down list with the different property d...
Using IQueryable with Linq
...tackOverflowUser No - that's the beauty of IQueryable<T> - it can be setup to evaluate when you get the results - which means the Where clause, used after the fact, will still get translated into a SQL statement run on the server, and pull only the required elements across the wire...
...
How many levels of pointers can we have?
... didn't try higher. So I'd guess g++ doesn't impose any limit either. (Try setting size = 10 and looking in ptr.cpp if it's not immediately obvious.)
g++ create.cpp -o create ; ./create > ptr.cpp ; g++ ptr.cpp -o ptr ; ./ptr
create.cpp
#include <iostream>
int main()
{
const int size...
SQLite add Primary Key
... key index, (i.e. sqlite_autoindex_XXX_1, where XXX is the table name) and set the sql string to NULL. At last change the table definition itself.
One pittfal: sqlite does not see the index name change until the database is reopened. This seems like a bug, but not a severe one (even without reopenin...