Screenify. Couple minor glitches are fixed: 1. line 1 - use bash, instead of sh. 2. here-docs were not properly terminated.

screenify

#!/bin/bash
#
# Trick process(es) to talk to current terminal
#
# Copyright (c) 2004, 2005 Timo Lindfors <timo.lindfors@iki.fi>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
#
# 3. The name of the author may not be used to endorse or promote
# products derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
# GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
# IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

function usage() {
    echo usage: $0 pid ...
        exit 1
}
TCGETS=0x5401
TCSETS=0x5402
SIZEOF_STRUCT_TERMIOS=60
O_RDWR=2
((FLAGS=O_RDWR))

if [ x`which gdb` = x ]; then
	    echo gdb not found in PATH. Please apt-get install gdb
	        exit
	fi
	if [ x$1 = x ]; then
		    usage;
	    fi

	    for PID in $@; do
		        MYPID=$$
			    MYFD0=`readlink /proc/$MYPID/fd/0`
			        MYFD1=`readlink /proc/$MYPID/fd/1`
				    MYFD2=`readlink /proc/$MYPID/fd/2`
				        EXE=`readlink /proc/$PID/exe`
					    if [ x$EXE = x ]; then
						    	echo $0: $PID: no such pid
								exit
								    fi

								        BATCHFILE=`mktemp /tmp/gdb.XXXXXXXXXXXX`
									    cat >$BATCHFILE <<-EOF
									    file $EXE
									    attach $PID
									    call malloc($SIZEOF_STRUCT_TERMIOS)
									    call malloc($SIZEOF_STRUCT_TERMIOS)
									    call malloc($SIZEOF_STRUCT_TERMIOS)
									    call ioctl(0, $TCGETS, \$1)
									    call ioctl(1, $TCGETS, \$2)
									    call ioctl(2, $TCGETS, \$3)
									    call close(0)
									    call close(1)
									    call close(2)
									    call open("$MYFD0", $FLAGS)
									    call open("$MYFD1", $FLAGS)
									    call open("$MYFD2", $FLAGS)
									    call ioctl(0, $TCSETS, \$1)
									    call ioctl(1, $TCSETS, \$2)
									    call ioctl(2, $TCSETS, \$3)
									    call free(\$1)
									    call free(\$2)
									    call free(\$3)
									    detach
									EOF
									        gdb -batch -x $BATCHFILE >/dev/null 2>&1 </dev/null
										    rm $BATCHFILE
									    done
									    cat <<-EOF
									    Process(es) $@ should now be talking to this pty. Refresh the screen
									    (e.g. CTRL+L) and have fun!
									    EOF

									    exec tail -f --pid=$PID /proc/$PID/stat