ruby​​使用变量执行bash命令

Question

我需要在Ruby脚本中执行Bash命令。根据"6 Ways to Run Shell Commands in Ruby" by Nate Murray和其他一些Google搜索源，大约有6种方法可以做到这一点。

print "enter myid: " 
myID = gets 
myID = myID.downcase 
myID = myID.chomp 
print "enter host: " 
host = gets 
host = host.downcase 
host = host.chomp 
print "winexe to host: ",host,"\n" 
command = "winexe -U domain\\\\",ID," //",host," \"cmd\"" 
exec command 

Answer 1

对于什么是值得你其实可以连锁的方法，并puts将打印一个换行符你，所以这可能仅仅是：

print "enter myid: " 
myID = STDIN.gets.downcase.chomp 

print "enter host: " 
host = STDIN.gets.downcase.chomp 

puts "winexe to host: #{host}" 
command = "winexe -U dmn1\\\\#{myID} //#{host} \"cmd\"" 
exec command 

Answer 2

它看起来像有可能是麻烦你是怎样把你的命令字符串。
另外，我不得不直接引用STDIN。

# Minimal changes to get it working: 
print "enter myid: " 

myID = STDIN.gets 
myID = myID.downcase 
myID = myID.chomp 

print "enter host: " 
host = STDIN.gets 
host = host.downcase 
host = host.chomp 

print "winexe to host: ",host,"\n" 
command = "echo winexe -U dmn1\\\\#{myID} //#{host} \"cmd\"" 
exec command 

紧凑型：

print "enter myid: " 
myID = STDIN.gets.downcase.chomp 

print "enter host: " 
host = STDIN.gets.downcase.chomp 

puts "winexe to host: #{host}" 
exec "echo winexe -U dmn1\\\\#{myID} //#{host} \"cmd\"" 

最后两行用printf类型：

puts "winexe to host: %s" % host 
exec "echo winexe -U dmn1\\\\%s //%s \"cmd\"" % [myID, host] 

最后两行加字符串连接：

puts "winexe to host: " + host 
exec "echo winexe -U dmn1\\\\" + myID + " //" + host + " \"cmd\"" 

个

最后两行用C++风格的追加：

puts "winexe to host: " << host 
exec "echo winexe -U dmn1\\\\" << myID << " //" << host << " \"cmd\""