1#@!#!123s

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Filename : expect_unbuffer
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#!/bin/sh
# -*- tcl -*-
# The next line is executed by /bin/sh, but not tcl \
exec tclsh8.6 "$0" ${1+"$@"}

package require Expect


# -*- tcl -*-
# Description: unbuffer stdout of a program
# Author: Don Libes, NIST

if {[string compare [lindex $argv 0] "-p"] == 0} {
    # pipeline
    set stty_init "-echo"
    eval [list 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 [list spawn -noecho] $argv
    expect
    exit [lindex [wait] 3]
}