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How can I check if a command exists in a shell script? [duplicate]
... a script or sourcing the script. Change exit 1 to return 1 or some other error code if you are doing so.
– mgild
Feb 7 '17 at 1:11
...
How can I generate an MD5 hash?
...("MD5"); not enough? I tried to add "MD5" in getBytes() but it returned an error
– Blaze Tama
Feb 19 '14 at 5:29
2
How to check if a string is a valid JSON string in JavaScript without using Try/Catch
...wing cases:
// Neither JSON.parse(false) or JSON.parse(1234) throw errors, hence the type-checking,
// but... JSON.parse(null) returns null, and typeof null === "object",
// so we must check for that, too. Thankfully, null is falsey, so this suffices:
if (o &&...
How to split a delimited string into an array in awk?
...specific! What do you mean by "it doesn't work"?
Post the exact output (or error message), your OS and awk version:
% awk -F\| '{
for (i = 0; ++i <= NF;)
print i, $i
}' <<<'12|23|11'
1 12
2 23
3 11
Or, using split:
% awk '{
n = split($0, t, "|")
for (i = 0; ++i <= n;)
...
Why is the C++ STL is so heavily based on templates? (and not on *interfaces*)
...s.
The only problem I see with STL, and templates in general is the awful error messages.
Which will be solved using Concepts in C++0X.
Comparing STL to Collections in Java is Like comparing Taj Mahal to my house :)
sha...
What is SuppressWarnings (“unchecked”) in Java?
...ype-safety means: A program is considered type-safe if it compiles without errors and warnings and does not raise any unexpected ClassCastException s at runtime.
I build on http://www.angelikalanger.com/GenericsFAQ/FAQSections/Fundamentals.html
...
How to determine if one array contains all elements of another array
...oing (a1 & a2) instead of (a2 & a1), which is why I was seeing the error. You are right about & retaining the order from the first array.
– CubaLibre
Aug 23 '12 at 13:35
...
Auto start node.js server on boot
...
I got an error, but it worked with npm install qckwinsvc -g
– Adam Gerthel
Jun 15 '15 at 14:55
...
What is Normalisation (or Normalization)?
...ecific problem, usually related to redundancy.
Some typical normalization errors:
(1) Having more than one value in a cell. Example:
UserId | Car
---------------------
1 | Toyota
2 | Ford,Cadillac
Here the "Car" column (which is a string) have several values. That offends the first no...
Convert a Map to a POJO
...ctory().constructType(t));
} catch (Exception e) {
log.error("converting failed! aMap: {}, class: {}", getJsonString(aMap), t.getClass().getSimpleName(), e);
}
return null;
}
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