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.
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.
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:
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 lpr
pdf_file = "paper.pdf"
printer = "printer-name"
Open3.pipeline(["pdftops", pdf_file, "-"],
["lpr", "-P#{printer}"])
# count lines
Open3.pipeline("sort", "uniq -c", :in=>"names.txt", :out=>"count")
# cyclic pipeline
r,w = IO.pipe
w.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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