Shell unbuffering for CygWin: is it possible?

unbuffer.md

• Installing the Expect package and naming "unbuffer" this script:

#!/usr/bin/expect --
# Description: unbuffer stdout of a program
# Author: Don Libes, NIST
eval spawn -noecho $argv
set timeout -1
expect

• Installing the Expect package and naming "unbuffer" this other script:

#!/usr/bin/expect --
# Description: unbuffer stdout of a program
# Author: Don Libes, NIST
if {[string compare [lindex $argv 0] "-p"] == 0} {
    # pipeline
    set stty_init "-echo"
    eval spawn -noecho [lrange $argv 1 end]
    close_on_eof -i $user_spawn_id 0
    interact {
    eof {
        # flush remaining output from child
        expect -timeout 1 -re .+
        return
    }
    }
} else {
    set stty_init "-opost"
    set timeout -1
    eval spawn -noecho $argv
    expect
}