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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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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...
Creating a daemon in Linux
...ly a syslog daemon (syslogd) is used for logging messages to files (debug, error,...).
Besides that, there are a few required steps to daemonize a process.
If I remember correctly these steps are:
fork off the parent process & let it terminate if forking was successful. -> Because the p...
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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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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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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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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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...
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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Right HTTP status code to wrong input
...t is optimal HTTP response Code when not reporting 200 (everything OK) but error in input?
6 Answers
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