ios.close_read â nil
Instance Public methods
Closes the read end of a duplex I/O stream (i.e., one that contains both a
read and a write stream, such as a pipe). Will raise an
IOError if the stream is not duplexed.
f = IO.popen("/bin/sh","r+")
f.close_read
f.readlines
produces:
prog.rb:3:in `readlines': not opened for reading (IOError)
from prog.rb:3