pipeline(*cmds)
Class Public methods
::pipeline starts a list of commands as a pipeline. It waits the finish of the commands. No pipe made for stdin of the first command and stdout of the last command.
1 | status_list = Open3.pipeline(cmd1, cmd2, ... [, opts]) |
Each cmd is a string or an array. If it is an array, the elements are passed to Process.spawn.
1 2 3 4 5 6 7 | cmd: commandline command line string which is passed to a shell [env, commandline, opts] command line string which is passed to a shell [env, cmdname, arg1, ..., opts] command name and one or more arguments (no shell) [env, [cmdname, argv0], arg1, ..., opts] command name and arguments including argv[0] (no shell)Note that env and opts are optional, as Process.spawn. |
Example:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | fname = "/usr/share/man/man1/ruby.1.gz"p Open3.pipeline(["zcat", fname], "nroff -man", "less")#=> [#<Process::Status: pid 11817 exit 0>,# #<Process::Status: pid 11820 exit 0>,# #<Process::Status: pid 11828 exit 0>]fname = "/usr/share/man/man1/ls.1.gz"Open3.pipeline(["zcat", fname], "nroff -man", "colcrt")# convert PDF to PS and send to a printer by lprpdf_file = "paper.pdf"printer = "printer-name"Open3.pipeline(["pdftops", pdf_file, "-"], ["lpr", "-P#{printer}"])# count linesOpen3.pipeline("sort", "uniq -c", :in=>"names.txt", :out=>"count")# cyclic pipeliner,w = IO.pipew.print "ibase=14\n10\n"Open3.pipeline("bc", "tee /dev/tty", :in=>r, :out=>w)#=> 14# 18# 22# 30# 42# 58# 78# 106# 202 |
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