ruby memo
Hello.rb
#! /usr/bin/ruby
puts "Hello World!"
argument
# foo.rb aaa bbb ccc
arg1 = ARGV[0] # "aaa"
arg2 = ARGV[1] # "bbb"
arg3 = ARGV[2] # "ccc"
arg_count = ARGV.size # 3
work
wk = "ABCDEF"
ch = wk[0] # "A"
ch_code = ch.ord # 65
ch = ch_code.chr # "A"
substr = wk[2..3] # "CD"
substr = wk[2,3] # "CDE"
str = "wk is #{wk}" # "wk is ABCDEF"
str = 'wk is #{wk}' # "wk is #{wk}"
array
array = [ "aaa", "bbb", "ccc" , "ddd", "eee", "fff" ]
array[0] # "aaa"
array[2..4] # [ "ccc" , "ddd", "eee" ]
array[2,3] # [ "ccc" , "ddd", "eee" ]
array.size # 6
array = []
array[0] = "aaa"
array[1] = "bbb"
array[2] = "ccc"
hash
hash = { "key1" => "data1", "key2" => "data2", "key3" => "data3" }
hash["key1"] # "data1"
hash = {}
hash["key1"] = "data1"
hash["key2"] = "data2"
hash["key3"] = "data3"
operator
amari = puts 12 % 5 # 2
bekijou = puts 2 ** 3 # 8
if
wk1 = 10
wk2 = 20
if (wk1 == wk2)
puts "#{wk1} == #{wk2}"
elseif (wk1 > wk2)
puts "#{wk1} > #{wk2}"
else
puts "#{wk1} < #{wk2}" # true
end
if (wk1 != wk2)
puts "#{wk1} != #{wk2}" # true
else
puts "#{wk1} == #{wk2}"
end
wk = "abcdef"
if (/^a.*f$/ =~ wk)
puts "true"
else
puts "false"
end
case
wk = 10
case wk
when 5
puts "five"
when 10
puts "ten" # true
when 15
puts "fifteen"
else
puts "many"
end
while
i = 0
while (i < 5)
puts i
i += 1
end
for
array = [ "bbb", "aaa", "ccc" ]
for i in array
puts i
end
for i in array.sort
puts i
end
for i in 0..2
puts array[i]
end
hash = { "key2" => "data2", "key1" => "data1", "key3" => "data3" }
for i in hash.keys
puts hash[i]
end
for i in hash.keys.sort
puts hash[i]
end
each
array = [ "aaa", "bbb", "ccc" ]
array.each do |i|
puts i
end
hash = { "key1" => "data1", "key2" => "data2", "key3" => "data3" }
hash.each do |key, val|
puts key + "=>" + val
end
step
1.step(10, 3) do |i|
puts i
end
gsub
wk1 = "ABCDEFG"
wk2 = wk1.gsub(/C.*E/, 'cde')
wk2 # "ABcdeFG"
wk1 = "ABCDEFG"
wk2 = wk1.gsub(/^AB(C.*E)FG/){"ab" + $1 + "fg"}
wk2 # "abCDEfg"
wk = "%41%42%43+%44%45%46"
wk = wk.tr("+", " ")
wk = wk.gsub(/%([0-9a-zA-Z][0-9a-zA-Z])/){$1.hex.chr}
wk # "ABC DEF"
split
wk = "aaa,bbb,ccc"
array = wk.split(',')
array[0] # "aaa"
array[2] # "ccc"
wk = "aaa,bbb,ccc,ddd"
array = wk.split(',', 3)
array[1] # "bbb"
array[2] # "bbb,ccc"
string
wk = "abcabcabc"
wk.length # 9
wk.index('abc') # 0
wk.rindex('abc') # 6
wk_str = "123"
wk_int = wk_str.to_i # 123
wk_float = wk_str.to_f # 123.0
wk_str = wk_float.to_s # "123.0"
file(line)
f = open("junk.txt", "w")
f.puts("line1")
f.puts("line2")
f.puts("line3")
f.flush
f.close
f = open("junk.txt", "r")
while (r = f.gets)
r = r.chomp
puts r
end
f.close
file(random)
# -*- encoding: utf-8 -*-
f = open("junk.txt", "w")
f.write("line1")
f.write("ｌｉｎｅ２")
f.write("line3")
f.close
f = open("junk.txt", "r")
f.pos = 5
r = f.read(5)
puts r + "\n" # "ｌｉｎｅ２"
f.close
file(character)
# -*- encoding: utf-8 -*-
work = "line1\nline2\nline3\n"
f = open("junk.txt", "w")
for i in 0..(work.length-1)
f.putc(work[i])
end
f.close
f = open("junk.txt", "r")
while (ch = f.getc)
print ch
end
f.close
STDIN, STDOUT, STDERR
STDOUT.puts("hogehoge")
STDERR.puts("hogehoge")
r = STDIN.gets
execute command
f = open("|ls -al|head -5", "r")
while (r = f.gets)
puts r.chomp
end
f.close
`ls -al|head -5`.each_line do |i|
puts i.chomp
end
io = IO.popen("cat -n", "r+")
io.puts("line1")
io.puts("line2")
io.puts("line3")
io.flush # flushをするのが確実。
io.close_write # ただし、起動プログラムの作りによるとclose_writeする必要がある。
r = io.gets
puts r
r = io.gets
puts r
r = io.gets
puts r
io.close
system("ls -al|head -5")
print
wk = "ABCDEFG"
puts wk
print wk + "\n"
printf("%s\n", wk)
trap
begin
wk = 1 / 0
rescue => e
puts "Exception -> #{e}"
p e
else
puts "No exception"
ensure
puts "always will be done"
end
begin
wk = 1 / 0
rescue ZeroDivisionError => e
puts "Exception -> #{e}"
p e
else
puts "No exception"
ensure
puts "always will be done"
end
filesystem
File.umask(022)
File.chmod(0777, "junk.txt")
File.rename("junk.txt", "junk2.txt")
File.unlink("junk2.txt")
File.exist?("junk.txt")
File.file?("junk.txt")
File.directory?("junk.txt")
File.readable?("junk.txt")
File.writable?("junk.txt")
File.executable?("junk.txt")
File.zero?("junk.txt")
File.size("junk.txt")
File.basename("/etc/named.conf", ".conf") # "named"
File.dirname("/etc/named.conf") # "/etc"
File.expand_path("./junk.txt") # "/absolute_path/junk.txt"
Dir.mkdir("lock.dir", 0755)
Dir.rmdir("lock.dir")
array = Dir.glob("./*")
for i in array
puts i
end
Dir.chdir("..")
Dir.pwd
dir = Dir.open("/")
while (name = dir.read)
puts name
end
dir.close
function
def add(v1 = 10, v2 = 20)
if ($Global_v1 && $Global_v2)
ret = $Global_v1 + $Global_v2
else
ret = v1 + v2
end
return ret
end
puts add() # 30
puts add(100, 200) # 300
$Global_v1 = 1000
$Global_v2 = 2000
puts add() # 3000
class
class MySwitch
def initialize(sw = 0)
@sw = sw
end
def turnOn()
@sw = 1
end
def turnOff()
@sw = 0
end
def isOn()
return (@sw == 1)
end
def isOff()
return !isOn()
end
end
class MyToggleSwitch < MySwitch
def initialize(sw = 0)
super(sw)
end
def toggle()
if (isOn())
turnOff()
else
turnOn()
end
end
end
sw1 = MySwitch.new
if (sw1.isOn())
puts "sw1 is On"
else
puts "sw1 is Off"
end
sw1.turnOn()
if (sw1.isOn())
puts "sw1 is On"
else
puts "sw1 is Off"
end
sw1.turnOff()
if (sw1.isOn())
puts "sw1 is On"
else
puts "sw1 is Off"
end
sw2 = MyToggleSwitch.new
if (sw2.isOn())
puts "sw2 is On"
else
puts "sw2 is Off"
end
sw2.toggle()
if (sw2.isOn())
puts "sw2 is On"
else
puts "sw2 is Off"
end
sw2.toggle()
if (sw2.isOn())
puts "sw2 is On"
else
puts "sw2 is Off"
end
environment variable
path = ENV['PATH']
daytime
day = Time.now
puts day # "2016-12-15 16:50:46 +0900"
puts day.year # "2016"
puts day.month # "12"
puts day.day # "15"
puts day.hour # "16"
puts day.min # "50"
puts day.sec # "46"
puts day.wday # "4" -> Thu
day += (3 * 24 * 60 * 60)
puts day.wday # "0" -> Sun
day = Time.local(2016,12,31,23,59,59)
kill
begin
Process.kill("TERM", 1234)
rescue Errno::ESRCH
puts "no such process"
else
puts "signal send ok"
ensure
end
nkf
require "nkf"
puts NKF.nkf("-S -X -e", "\x8a\xbf\x8e\x9a\x82\xc5\x82\xb7") # "漢字です"
timeout
require "timeout"
begin
timeout(3){
sleep 10
}
rescue Timeout::Error
puts "timeout happened!"
else
puts "10sec sleepd"
ensure
end
yield
def hoge(count)
for i in 1..count
yield(i, i*i)
end
end
hoge(5) do |v1, v2|
puts "v1=#{v1}, v2=#{v2}"
end
client
require "socket"
s = TCPSocket.new("localhost", 12345)
s.sync = true
s.puts "#{ARGV[0]}"
print s.gets
s.puts "Q"
server
require 'socket'
def daemon
if (pid = fork)
exit 0
end
Process.setsid
if (pid = fork)
exit 0
end
Dir.chdir("/")
File.umask(0000)
STDIN.close
STDOUT.close
STDERR.close
Signal.trap("SIGTERM"){
exit 0
}
Signal.trap("SIGHUP"){
exit 0
}
Signal.trap("SIGINT"){
exit 0
}
end
daemon
port = 12345
gs = TCPServer.open(port)
while true
ns = gs.accept
# p ns.peeraddr
Thread.start(ns) do |s|
s.sync = true
while line = s.gets
break if /^q/i =~ line
line.chomp!
s.puts "#{line.swapcase}"
end
s.close
end
end
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