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Abort makefile if variable not set
...rror MY_FLAG is not set)
endif
Note that the lines must not be indented. More precisely, no tabs must precede these lines.
Generic solution
In case you're going to test many variables, it's worth defining an auxiliary function for that:
# Check that given variables are set and all have non-em...
Regex for password must contain at least eight characters, at least one number and both lower and up
... password must always have the exact same order. what of something more generic that can start with upper case or special characters.
– Ichinga Samuel
Jun 15 at 20:01
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how to release localhost from Error: listen EADDRINUSE
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Your npm start script might be more than one node program, or a node program that is ran in the background, or the program might have child processes who use that port.
– fent
May 12 '13 at 3:33
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What is the difference between `new Object()` and object literal notation?
...as to what is happening, so using new Object(), you are really just typing more and (in theory, if not optimized out by the JavaScript engine) doing an unnecessary function call.
These
person = new Object() /*You should put a semicolon here too.
It's not required, but it is good practice.*/
-o...
How do I make a Git commit in the past?
... of Git.
Inserting a File Into a Multi-ref History
If your repository is more complex (i.e. it has more than one ref (branches, tags, etc.)), then you will probably need to use git filter-branch. Before using git filter-branch, you should make a backup copy of your entire repository. A simple tar ...
Vim multiline editing like in sublimetext?
... visual selection back, and then move horizontally, perhaps with 2e. (The more lines, the more valuable gv is!)
– joeytwiddle
Jan 16 '15 at 23:30
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Getting image dimensions without reading the entire file
... headers (you can easily get them in interlaced JPGs). And, to make things more fun, height can be 0 and specified later in a 0xDC block. See w3.org/Graphics/JPEG/itu-t81.pdf
– Vilx-
Feb 22 '11 at 12:36
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“Bitmap too large to be uploaded into a texture”
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How to dynamically build a JSON object with Python?
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