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how perform grep operation on all files in a directory
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grep $PATTERN * would be sufficient. By default, grep would skip all subdirectories. However, if you want to grep through them, grep -r $PATTERN * is the case.
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Determine the data types of a data frame's columns
...ation as a vector (i.e. you don't need it to do something else programmatically later), just use str(foo).
In both cases foo would be replaced with the name of your data frame.
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How to access a dictionary element in a Django template?
...s the following lookups, in
this order:
Dictionary lookup (e.g., foo["bar"])
Attribute lookup (e.g., foo.bar)
Method call (e.g., foo.bar())
List-index lookup (e.g., foo[2])
The system uses the first lookup type
that works. It’s short-circuit logic.
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Javascript objects: get parent [duplicate]
...}.init();
Inside the init function you can get the parent object simply calling this.
So we define the parent property directly inside the child object.
Then (optionally) we can remove the init method.
Finally we give the main object back as output from the init function.
If you try to get main...
What is the difference between include and extend in Ruby?
...end Mod. In this case the individual object gets Mod's methods even though all other objects with the same class as o do not.
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Emacs bulk indent for Python
...enter 8 spaces.
PS. With Ubuntu, to make python-mode the default mode for all .py files, simply install the python-mode package.
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git pull aborted with error filename too long
...ates, looks like there is some additional script you need to run after installing mysysgit github.com/msysgit/git/pull/122#issuecomment-43653756
– Adam Grant
Aug 1 '14 at 18:36
18
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Can I do a partial revert in GIT
...without creating a new one by adding the '--no-commit' option. This leaves all the reverted files in the staging area. From there, I'd perform a soft reset and add in the changes I really wanted. For an example workflow:
git revert <sha-of-bad-commit> --no-commit
git reset // This gets them...
Why do we copy then move?
...rvalues, the above would not compile.
Won't a copy be expensive, especially given something like std::string?
If you pass an rvalue, that will be moved into str, and that will eventually be moved into data. No copying will be performed. If you pass an lvalue, on the other hand, that lvalue wil...
Convert JSON String to JSON Object c#
...n = JsonConvert.DeserializeObject(str);
or try for a typed object try:
Foo json = JsonConvert.DeserializeObject<Foo>(str)
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