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What is the best way to ensure only one instance of a Bash script is running? [duplicate]
...ready running
flock -n /var/lock/myjob.lock my_bash_command
Use -w for timeouts or leave out options to wait until the lock is released. Finally, the man page shows a nice example for multiple commands:
(
flock -n 9 || exit 1
# ... commands executed under lock ...
) 9>/var/l...
How to configure socket connect timeout
... the Client tries to connect to a disconnected IP address, there is a long timeout over 15 seconds... How can we reduce this timeout? What is the method to configure it?
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byte[] to hex string [duplicate]
How do I convert a byte[] to a string ? Every time I attempt it, I get
19 Answers
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How to get the current date and time
How do I get the current date and time in Java?
10 Answers
10
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ArrayIndexOutOfBoundsException when using the ArrayList's iterator
...ing iterator twice in each iteration, you're getting new iterators all the time.
The easiest way to write this loop is using the for-each construct:
for (String s : arrayList)
if (s.equals(value))
// ...
As for
java.lang.ArrayIndexOutOfBoundsException: -1
You just tried to get ...
Run all SQL files in a directory
...an . i was thinking of doing one by one some 200 sql files. saved a lot of time
– Uthistran Selvaraj
Jul 5 '17 at 6:14
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Normal arguments vs. keyword arguments
...ictionary named kwargs. You can examine the keys of this dictionary at run-time, like this:
def my_function(**kwargs):
print str(kwargs)
my_function(a=12, b="abc")
{'a': 12, 'b': 'abc'}
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Insert line after first match using sed
... can't seem to find a straightforward answer to this and I'm on a bit of a time crunch at the moment. How would I go about inserting a choice line of text after the first line matching a specific string using the sed command. I have ...
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Why do I get a segmentation fault when writing to a “char *s” initialized with a string literal, but
...mory is mutable, since there are no instructions in the data segment. This time when the compiler initializes the character array (which is still just a char*) it's pointing into the data segment rather than the text segment, which you can safely alter at run-time.
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Casting a variable using a Type variable
...tual type. With proper interfaces that shouldn't be necessary 99.9% of the times. There are perhaps a few edge cases when it comes to reflection that it might make sense, but I would recommend to avoid those cases.
Edit 2:
Few extra tips:
Try to keep your code as type-safe as possible. If the co...