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How can I pipe stderr, and not stdout?
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Or to swap the output from standard error and standard output over, use:
command 3>&1 1>&2 2>&3
This creates a new file descriptor (3) and assigns it to the same place as 1 (standard output), then assigns fd 1 (standard output) to the sa...
MySQL Update Inner Join tables query
I have no idea what the problem is. Using MySQL 5.0 I get a compile error when attempting to run the following MySQL update query:
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sed error: “invalid reference \1 on `s' command's RHS”
...t/' works but sed -e 's/([[:digit:]])/\1 is a digit/ produces the original error without -r to sed. NOTE: the first invocation of sed searches for a literal (<digit>) and is not a capture group.
– Andrew Falanga
Mar 24 '16 at 14:58
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cleanest way to skip a foreach if array is empty [duplicate]
... code with an unnecessary if statement. If $items is empty php throws an error.
11 Answers
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Cleanest way to write retry logic?
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+1, especially for the warning and error-checking. I'd be more comfortable if this passed in the type of the exception to catch as a generic parameter (where T: Exception), though.
– TrueWill
Oct 13 '09 at 22:55
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A complete solution to LOCALLY validate an in-app receipts and bundle receipts on iOS 7
...nReceipt:receipt success:successBlock failure:failureBlock];
} failure:^(NSError *error) {
[self failWithBlock:failureBlock error:error];
}];
Getting the receipt data
The receipt is in [[NSBundle mainBundle] appStoreReceiptURL] and is actually a PCKS7 container. I suck at cryptography so I us...
Is errno thread-safe?
...my question is, is it safe to check errno value after some calls or use perror() in multi-threaded code. Is this a thread safe variable? If not, then whats the alternative ?
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How to fix 'sudo: no tty present and no askpass program specified' error?
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Try:
ssh -t remotehost "sudo <cmd>"
This will remove the above errors.
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Eclipse executable launcher error: Unable to locate companion shared library
...am files have completely disappeared. When I try to reinstall it, I get an error message that says
29 Answers
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INSERT … ON DUPLICATE KEY (do nothing)
...row update even though id is assigned to itself).
If you don't care about errors (conversion errors, foreign key errors) and autoincrement field exhaustion (it's incremented even if the row is not inserted due to duplicate key), then use INSERT IGNORE.
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