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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($0, t, "|")
for (i = 0; ++i <= n;)
...
What are dictionary view objects?
...iew, how the iterator should behave is not well defined, which can lead to errors.
One advantage is that looking at, say, the keys uses only a small and fixed amount of memory and requires a small and fixed amount of processor time, as there is no creation of a list of keys (Python 2, on the other...
How do I expire a PHP session after 30 minutes?
...file_exists($path)) {
if(!mkdir($path, 600)) {
trigger_error("Failed to create session save path directory '$path'. Check permissions.", E_USER_ERROR);
}
}
ini_set("session.save_path", $path);
// Set the chance to trigger the garbage collection.
ini_set("...
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 the difference between C, C99, ANSI C and GNU C?
...ograms according to the C standard, you should type gcc -std=c99 -pedantic-errors. Replace c99 with c11 if your GCC version supports it.
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