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What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
...ave a lot of quotes in your string these alternative forms can get hard to read (and therefore hard to maintain). This page provides a good introduction to quoting in Bash.
Arrays ($var vs. $var[@] vs. ${var[@]})
Now for your array. According to the bash manual:
Referencing an array variable w...
How do I analyze a program's core dump file with GDB when it has command-line parameters?
...tput warning: core file may not match specified executable file. Failed to read a valid object file image from memory.
– Treper
Nov 29 '11 at 5:07
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How to update a record using sequelize for node?
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I have not used Sequelize, but after reading its documentation, it's obvious that you are instantiating a new object, that's why Sequelize inserts a new record into the db.
First you need to search for that record, fetch it and only after that change its proper...
C state-machine design [closed]
...am building one small-ish state-machine at the heart of one of my worker thread.
27 Answers
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How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
...e.
If you're on 9.5 and don't need to be backward-compatible you can stop reading now.
9.4 and older:
PostgreSQL doesn't have any built-in UPSERT (or MERGE) facility, and doing it efficiently in the face of concurrent use is very difficult.
This article discusses the problem in useful detail.
In g...
How to turn NaN from parseInt into 0 for an empty string?
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@markzzz Read question again. OP asks: "Is it possible somehow to return 0 instead of NaN". OP don't want to check, whether particular string is parsable to int. OP wants to get 0 instead of NaN. This is solved by Matt's code perfectl...
Untrack files from git temporarily
... assume-unchanged wasn't meant for this purpose. Might want to read this thread
– Appy
Jun 6 '16 at 21:44
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show 4 more comments...
Where to put Gradle configuration (i.e. credentials) that should not be committed?
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You could put the credentials in a properties file and read it using something like this:
Properties props = new Properties()
props.load(new FileInputStream("yourPath/credentials.properties"))
project.setProperty('props', props)
Another approach is to define environment vari...
Java heap terminology: young, old and permanent generations?
... Java VMs that use class data sharing,
this generation is divided into
read-only and read-write areas.
Code Cache (non-heap): The HotSpot Java VM also includes a code cache,
containing memory that is used for
compilation and storage of native
code.
Java uses generational garbage col...
How to prevent a click on a '#' link from jumping to top of page?
..., do an event.preventDefault(). This is more clear for the people who will read your code.
– RvdK
Jul 15 '10 at 6:06
@...