When to use each method of launching a subprocess in Ruby
1. `` The Backtick defined in Kernel 1. a) %x{} Percent X < alternate syntax for The Backtick defined in parse.y, see discussion 2. system() Kernel#system 3. fork() Kernel#fork, Process#fork 4. open() open a pipe Kernel#open 4.a. IO.popen() < behaves the same as open() open a pipe IO#popen 4.b. open("|-") fork to a pipe 4.c. IO.popen("-") < behaves the same as open("|-") fork to a pipe see discuss
Ruby Subprocesses with stdout and stderr Streams
I’ve been doing a few things with Ruby which involve controlling and responding to long-running processes, where the Ruby-based ‘wrapper’ takes the task of automating something which is otherwise quite complex. Perhaps the best example is boxes, which uses a collection of Rake tasks to generate Vagrant boxes using Packer –– each build takes somewhere in the region of twenty minutes to complete. Bu
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Rubyã§å¤–部コマンドを実行ã™ã‚‹æ‰‹æ®µã¯ã„ã‚ã„ã‚ã‚ã‚‹ã‘ã©ã€ãã®ã»ã¨ã‚“ã©ã¯å®Ÿè¡Œã—終ã‚ã£ãŸã¨ãã«ã¾ã¨ã‚ã¦æ¨™æº–出力ç‰ã‚’å¾—ã‚‹ã“ã¨ã«ãªã‚‹ã€‚時間ãŒã‹ã‹ã‚‹ã‚³ãƒžãƒ³ãƒ‰ã‚’実行ã—ã¤ã¤ãã®å‡ºåŠ›ã‚’éšæ™‚å—ã‘å–ã‚ŠãŸã„å ´åˆã«ã¯Open3.popen3を使ã†ã€‚ require "open3" Open3.popen3("long-long-command") do |stdin, stdout, stderr, wait_thr| stdin.close_write # 標準入力を閉ã˜ã‚‹ã€‚ begin # 標準出力ã€æ¨™æº–エラーã®å‡ºåŠ›ãŒã‚ã‚‹ã¾ã§å»¶ã€…ã¨å¾…ã¡ã€éšæ™‚1è¡Œãšã¤æ›¸ã出㙠loop do IO.select([stdout, stderr]).flatten.compact.each do |io| io.each do |line| next if line.nil? || line.empty? puts line e
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ssh_scan/lib/ssh_scan/subprocess.rb at 0.0.43 · mozilla/ssh_scan
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