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How can I read a large text file line by line using Java?
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A common pattern is to use
try (BufferedReader br = new BufferedReader(new FileReader(file))) {
String line;
while ((line = br.readLine()) != null) {
// process the line.
}
}
You can read the data faster i...
Running multiple commands with xargs
In the example above, xargs takes echo % as the command argument. But in some cases, I need multiple commands to process the argument instead of one. For example:
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Disable validation of HTML5 form elements
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How do I add the contents of an iterable to a set?
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add a comment
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What is the use case of noop [:] in bash?
...forever'
done
It's traditional to use : when the shell syntax requires a command but you have nothing to do.
while keep_waiting; do
: # busy-wait
done
The : builtin dates all the way back to the Thompson shell, it was present in Unix v6. : was a label indicator for the Thompson shell's goto s...
Converting string to byte array in C#
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110
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Get record counts for all tables in MySQL database
... @krunalshah, This is one of the restrictions of InnoDB. See dev.mysql.com/doc/refman/5.0/en/innodb-restrictions.html, section Restrictions on InnoDB Tables, for more info. You could always use a SELECT COUNT(*) FROM t, which however, is a lot slower
– Marking
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Make sure only a single instance of a program is running
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Why doesn't java.lang.Number implement Comparable? [duplicate]
Does anyone know why java.lang.Number does not implement Comparable ? This means that you cannot sort Number s with Collections.sort which seems to me a little strange.
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INSERT IF NOT EXISTS ELSE UPDATE?
...s different than "insert or update". For a valid answer, see stackoverflow.com/questions/418898/…
– rds
Nov 12 '12 at 19:34
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