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Checking from shell script if a directory contains files
...nvokes (spawns) a sub-shell. The idea is from Bruno De Fraine and improved by teambob's comment.
files=$(shopt -s nullglob dotglob; echo your/dir/*)
if (( ${#files} ))
then
echo "contains files"
else
echo "empty (or does not exist or is a file)"
fi
Note: no difference between an empty direc...
How to compile and run C/C++ in a Unix console/Mac terminal?
...this path in the terminal with this command:
echo $PATH
On Mac OS X (by default) this will display the following colon separated search path:
/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin
So any executable in the listed directories can by run just by typing in their name. For...
Benefits of using the conditional ?: (ternary) operator
...about that? merriam-webster.com/dictionary/concise
– Byron Whitlock
Jul 22 '10 at 20:07
39
I alwa...
Difference between git pull --rebase and git pull --ff-only
...ince your local and remote branches have diverged, they cannot be resolved by a fast-forward and git pull --ff-only would fail.
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Get Value of a Edit Text field
...
By using getText():
Button mButton;
EditText mEdit;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(...
`from … import` vs `import .` [duplicate]
...c: The “single trailing underscore” convention is explicitly specified by PEP 8 (twice). If Eclipse produces annoying warnings about correct code, then we have a bad IDE, not a bad habit.
– wchargin
Feb 16 '18 at 9:11
...
What is a StackOverflowError?
...tself forever. Or when the termination condition is fine, it can be caused by requiring too many recursive calls before fulfilling it.
However, with GUI programming, it's possible to generate indirect recursion. For example, your app may be handling paint messages, and, whilst processing them, it m...
Are email addresses case sensitive?
I've read that by standard first part of e-mail is case sensitive, however I've tried to send e-mail to name@example.com , Name@example.com and NAME@example.com - it has arrived in each case.
...
Regex Last occurrence?
...p. The . is any character, this checks any character if it is not followed by a ``.
– stema
Dec 4 '11 at 12:18
The Mul...
Can I apply a CSS style to an element name?
...
For future googlers, FYI, the method in the answer by @meder , can be used with any element that has a name attribute, so lets say theres an <iframe> with the name xyz then you can use the rule as belows.
iframe[name=xyz] {
display: none;
}
The name attrib...