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What is the difference between Trap and Interrupt?
...ted by the hardware (devices like the hard disk, graphics card, I/O ports, etc). These are asynchronous (i.e. they don't happen at predictable places in the user code) or "passive" since the interrupt handler has to wait for them to happen eventually.
You can also see a trap as a kind of CPU-intern...
Fast way to discover the row count of a table in PostgreSQL
...block happens to hold wider than usual rows, the count is lower than usual etc.
Dead tuples or a FILLFACTOR occupy space per block. If unevenly distributed across the table, the estimate may be off.
General rounding errors.
In most cases the estimate from pg_class will be faster and more accurate....
How to install Xcode Command Line Tools
...else that has been unbundled from Xcode (audio tools, accessibility tools, etc.), OS X kernel debug builds, and release versions of Xcode back to 1.0.
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Should we use Nexus or Artifactory for a Maven Repo?
...s.xml
Deploying from Maven works out of the box (no need for WebDAV hacks, etc).
it's free
You can redirect access paths (i.e. some broken pom.xml requires "a.b.c" from "xxx"). Instead of patching the POM, you can fix the bug in Nexus and redirect the request to the place where the artifact really i...
Return all enumerables with yield return at once; without looping through
...teven: Nope. It's calling the methods - but in your case GetOtherErrors() (etc) are deferring their results (as they're implemented using iterator blocks). Try changing them to return a new array or something like that, and you'll see what I mean.
– Jon Skeet
A...
When to use std::size_t?
...imension of an item - length of a string, amount of bytes a pointer takes, etc.
It's also portable across platforms - you'll find that 64bit and 32bit both behave nicely with system functions and size_t - something that unsigned int might not do (e.g. when should you use unsigned long
...
Find what filetype is loaded in vim
... For example, if you want to highlight all PowerShell scripts .ps1, .psm1, etc., you put this file into your ~/.vim/ftdetect
Now that is a happy ending.
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How can I write a heredoc to a file in Bash script?
...redoc to a file using sudo:
cat <<'EOF' | sed 's/a/b/' | sudo tee /etc/config_file.conf
foo
bar
baz
EOF
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How to run cron once, daily at 10pm
...It can be "Bourne shell (sh) , Bourne again shell (bash),Korn shell (ksh)..etc"
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Javadoc link to method in other class
...aram, in the description for @return, in the main part of the description, etc.
– rgettman
Jul 5 '13 at 20:21
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