thetredev

Remove snap from Ubuntu

Tested with:

• Ubuntu Desktop 22.04.2
• Ubuntu Server 22.04.2

Both are VirtualBox VMs on my Void Linux host. Both have been installed using the following options:

• Normal installation (not minimal), to ensure it's fully bloated
• With third party drivers

After the install, sudo apt update and sudo apt full-upgrade have been applied. A reboot was done next.

fay59

Here's a list of mildly interesting things about the C language that I learned mostly by consuming Clang's ASTs. Although surprises are getting sparser, I might continue to update this document over time.

There are many more mildly interesting features of C++, but the language is literally known for being weird, whereas C is usually considered smaller and simpler, so this is (almost) only about C.

1. Combined type and variable/field declaration, inside a struct scope [https://godbolt.org/g/Rh94Go]

struct foo {
   struct bar {
 int x;

winksaville

Setup git send-email: following these instructions I had some problems. But the following worked:

• I’m using 2-factor auth on my gmail account so I had to get a “app-password”, see google documentation
• Modify the global/local .gitconfig file with a sendemail section: [sendemail] smtpEncryption = tls smtpServer = smtp.gmail.com smtpUser = wink@saville.com smtpServerPort = 587
• Also add a credential section with a helper.store entry:

shafik

What is the Strict Aliasing Rule and Why do we care?

(OR Type Punning, Undefined Behavior and Alignment, Oh My!)

What is strict aliasing? First we will describe what is aliasing and then we can learn what being strict about it means.

In C and C++ aliasing has to do with what expression types we are allowed to access stored values through. In both C and C++ the standard specifies which expression types are allowed to alias which types. The compiler and optimizer are allowed to assume we follow the aliasing rules strictly, hence the term strict aliasing rule. If we attempt to access a value using a type not allowed it is classified as undefined behavior(UB). Once we have undefined behavior all bets are off, the results of our program are no longer reliable.

Unfortunately with strict aliasing violations, we will often obtain the results we expect, leaving the possibility the a future version of a compiler with a new optimization will break code we th

davidbirdsong

[david@sjc1-b4-8 ~]$ go tool pprof  $HOME/bin/hwy-fetcher http://localhost:6060/debug/pprof/heap 
Fetching profile from http://localhost:6060/debug/pprof/heap
Saved profile in /home/david/pprof/pprof.hwy-fetcher.localhost:6060.inuse_objects.inuse_space.062.pb.gz
Entering interactive mode (type "help" for commands)
(pprof) top 
12612.08MB of 14824.44MB total (85.08%)
Dropped 799 nodes (cum <= 74.12MB)
Showing top 10 nodes out of 87 (cum >= 201.56MB)
      flat  flat%   sum%        cum   cum%
 6202.85MB 41.84% 41.84%  6202.85MB 41.84%  crypto/tls.(*block).reserve

brenopolanski

via: http://www.webupd8.org/2011/05/install-firefox-nightly-from-ubuntu-ppa.html

Add the Mozilla Daily PPA (available for Ubuntu 11.04, 10.10 and 10.04) and install Firefox Nightly using the commands below:

$ [sudo] add-apt-repository ppa:ubuntu-mozilla-daily/ppa
$ [sudo] apt-get update
$ [sudo] apt-get install firefox-trunk

Since this is a daily builds PPA, it's nowhere near stable so use it at your own risk!

apeckham

sequence(:ip_address) { |n| IPAddr.new(n, Socket::AF_INET).to_s }

# { |n| "10.0.0.#{n}" } caused spec flakiness

sauloperez

# Signal catching
def shut_down
  puts "\nShutting down gracefully..."
  sleep 1
end

puts "I have PID #{Process.pid}"

# Trap ^C 
Signal.trap("INT") { 

scaryguy

-- Firstly, remove PRIMARY KEY attribute of former PRIMARY KEY
ALTER TABLE <table_name> DROP CONSTRAINT <table_name>_pkey;

-- Then change column name of  your PRIMARY KEY and PRIMARY KEY candidates properly.
ALTER TABLE <table_name> RENAME COLUMN <primary_key_candidate> TO id;

rgreenjr

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'