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How to remove the lines which appear on file B from another file A?
...e a set, where there won't be any duplicate values (keys)
!($0 in a) we're now in the next file(s), in is a contains test, here it's checking whether current line is in the set we populated in the first step from the first file, ! negates the condition. What is missing here is the action, which by...
What are the uses of the exec command in shell scripts? [closed]
...profile, the last statement says something like:
exec appln-program
so now there is no shell to go back to. Even if appln-program crashes, the end-user cannot get to a shell, because it is not there - the exec replaced it.
We want to use a different shell to the one in /etc/passwd. Stupid as ...
Removing trailing newline character from fgets() input
...
Perhaps the simplest solution uses one of my favorite little-known functions, strcspn():
buffer[strcspn(buffer, "\n")] = 0;
If you want it to also handle '\r' (say, if the stream is binary):
buffer[strcspn(buffer, "\r\n")] = 0; // works for LF, CR, CRLF, LFCR, ...
The function cou...
Is there a decorator to simply cache function return values?
...
the backport can now be found here: pypi.python.org/pypi/backports.functools_lru_cache
– Frederick Nord
Jul 21 '15 at 7:55
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What is the difference between visibility:hidden and display:none?
...the line. Everyone in line will then move forward one position to fill the now empty slot. This is like display:none.
Contrast this with the similar situation, but that someone in front of you puts on an invisibility cloak. While viewing the line, it will look like there is an empty space, but peop...
How can I resize an image dynamically with CSS as the browser width/height changes?
...its should make your life way easier, given we have the image of a cat:
Now we want this cat inside our code, while respecting aspect ratios:
img {
width: 100%;
height: auto;
}
<img src="https://www.petmd.com/sites/default/files/petmd-cat-happy-10.jpg" alt="cat">
So far ...
How can I search Git branches for a file or directory?
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This works if you know the exact path to somefile: if you need regex search over the path/filename, for example, then you can use ididak's answer.
– ShreevatsaR
Feb 27 '12 at 9:05
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Is there a JavaScript function that can pad a string to get to a determined length?
...e relevant. The curse of recursion only applies when a programmer doesn't know when its appropriate.
– hypno7oad
Jul 31 '13 at 4:36
12
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How to check if a string contains a substring in Bash
...ash, and, of course Bash:
stringContain() { [ -z "${2##*$1*}" ]; }
Then now:
$ if stringContain 'o "M3' 'echo "My String"';then echo yes;else echo no;fi
no
$ if stringContain 'o "M' 'echo "My String"';then echo yes;else echo no;fi
yes
... Or if the submitted string could be empty, as pointed o...
Execute code when Django starts ONCE only?
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Update from Pykler's answer below: Django 1.7 now has a hook for this
Don't do it this way.
You don't want "middleware" for a one-time startup thing.
You want to execute code in the top-level urls.py. That module is imported and executed once.
urls.py
from django...