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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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Blank HTML SELECT without blank item in dropdown list
...
You can by setting selectedIndex to -1 using .prop: http://jsfiddle.net/R9auG/.
For older jQuery versions use .attr instead of .prop: http://jsfiddle.net/R9auG/71/.
...
Xcode: Build Failed, but no error messages
...failure on Report Navigator present in Navigator window.
Open Navigator by pressing Hide/Show Navigator button present in top-left side of Xcode.
Open Report Navigator by pressing last button present on list of buttons in Navigator window.
Here you can view reasons either By Group or By ...
Windows equivalent to UNIX pwd
...
Why do you need to echo? Just cd by itself seems to work fine.
– Kevin Workman
Feb 7 '18 at 5:20
1
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Setting up foreign keys in phpMyAdmin?
...In the row for PID, choose PARENT->ID from the dropdown and click GO.
By doing an export on the CHILD table, you should see a foreign key constraint has been created for the PID column.
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Fill SVG path element with a background-image
...
You can do it by making the background into a pattern:
<defs>
<pattern id="img1" patternUnits="userSpaceOnUse" width="100" height="100">
<image href="wall.jpg" x="0" y="0" width="100" height="100" />
</pattern&...
what is difference between success and .done() method of $.ajax
...ishes, regardless of success.
In jQuery 1.8 on the jqXHR object (returned by $.ajax) success was replaced with done, error with fail and complete with always.
However you should still be able to initialise the AJAX request with the old syntax. So these do similar things:
// set success action bef...