大约有 40,000 项符合查询结果（耗时：0.0671秒） [XML]
Test if a command outputs an empty string
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user 0m0.000s
sys 0m0.007s
Full example
Updated example from the answer by Will Vousden:
if [[ $(ls -A | wc -c) -ne 0 ]]; then
echo "there are files"
else
echo "no files found"
fi
Updated again after suggestions by netj:
if [[ $(ls -A | head -c1 | wc -c) -ne 0 ]]; then...
How to create loading dialogs in Android?
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It's a ProgressDialog, with setIndeterminate(true).
From http://developer.android.com/guide/topics/ui/dialogs.html#ProgressDialog
ProgressDialog dialog = ProgressDialog.show(MyActivity.this, "",
"Loading. Please wait...", true);
An indeterminate progres...
Where does Git store the SHA1 of the commit for a submodule?
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Yep. I see where it is now. And it matches the id from git submodule status. Thanks.
– Abizern
Feb 17 '11 at 20:21
7
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SQL (MySQL) vs NoSQL (CouchDB) [closed]
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Here's a quote from a recent blog post from Dare Obasanjo.
SQL databases are like automatic
transmission and NoSQL databases are
like manual transmission. Once you
switch to NoSQL, you become
responsible for a lot of work that t...
Error when trying vagrant up
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Thanks, it was driving me crazy hehe. greetings from Chile
– Cristian Meza
Dec 14 '15 at 4:59
1
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Increase distance between text and title on the y-axis
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From ggplot2 2.0.0 you can use the margin = argument of element_text() to change the distance between the axis title and the numbers. Set the values of the margin on top, right, bottom, and left side of the element.
ggplot(m...
How to fix the “java.security.cert.CertificateException: No subject alternative names present” error
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This is an old question, yet I had the same problem when moving from JDK 1.8.0_144 to jdk 1.8.0_191
We found a hint in the changelog:
Changelog
we added the following additional system property, which helped in our case to solve this issue:
-Dcom.sun.jndi.ldap.object.disableEndpointId...
Maximum filename length in NTFS (Windows XP and Windows Vista)?
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199 on Windows XP NTFS, I just checked.
This is not theory but from just trying on my laptop. There may be mitigating effects, but it physically won't let me make it bigger.
Is there some other setting limiting this, I wonder? Try it for yourself.
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Load image from url
I have an image URL. I want to display an image from this URL in an ImageView but I am unable to do that.
16 Answers
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Tool for generating railroad diagram used on json.org [closed]
...enerator. It creates SVG syntax diagrams, also known as railroad diagrams, from context-free grammars specified in EBNF. You can copy the SVG code or take screen shots.
You have to type in the grammar and it'll make the diagram.
For example, to create the first railroad diagram you show, you would...