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pacman -S python # Archlinux pkg install python37 # FreeBSD brew install python # MacOS

values can be put in sections sections cannot be nested '=' or ':' may be used interchangeably [section a] key_1 = value1 key_2 = value2 [section b] key_3

import ctypes #returns kernel ctypes.windll.kernel32

An AST parser for ruby, in ruby https://github.com/whitequark/parser ruby-parse -e 'puts "hello"' (send nil :puts (str "hello"))

Dir.mktmpdir("some_prefix_") do |dirpath| # ... end Tempfile.create("some_prefix_") do |fd| fd.write("hello") end

# keep copy of dir tar -cvf baikal_data.tar /usr/local/www/baikal/Specific # extract into new install

REM note the abscence of quotes around string set YOURVAR=Your Value echo %YOURVAR%

== # equals LEQ # <= GEQ # >= LSS # < GTR # > EQU # == NEQ # != if ("%var%" LEQ "3") { echo %var% is less than 3 }

vmstat shows info about processes, memory, paging, io, and cpu activity. vmstat 5 # run vmstat once every 5s

foo = sorted(['z', 'b', 'a']) # new copy sort(mylist) # mutates 'mylist' sorted(mylist, key=lambda x: x % 2) # sort by result of 'key'

cli screen capture tool, preinstalled with macos. screencapture -s -T 5 out.png # select region, wait 5s, then capture selection

redis-cli -h domain.com # connect to redis on cli redis-cli -h domain.com FLUSHALL # execute 'FLUSHALL' and exit

bulitin lib to examine/modify resources used by current program. Example import resource resource.getrusage(resource.RUSAGE_SELF).ru_maxrss

Alt-x, ielm ;; lisp interpreter

sudo pacman -S deluge-gtk # deluge is daemon only Edit > Preferences: Network: Encryption: Inbound: Required Outbound: Required Level: Full Stream

The oldest threading interface for python. import thread thread.start_new_thread(func, ('argA',), {'kwargA': 1}) lock = thread.allocate_lock() lock.acquire()

redis client for python import redis conn = redis.Redis(host='foo.bar.com', port=, password='password') conn.set('foo', 'bar') conn.get('foo') # >>> 'bar'

from passlib.hash import sha512_crypt sha512_crypt.hash('password')

$var === NULL // is instance $var !== NULL // is not instance $var = 1 // equal $var != 1 // not equal $var .= "bar" // append to string $var += 1; //

php classes are very similar to java, right down to extends and implements. class Foo { /** string */ private name; public function __constructor() { $this->name