Regarding overwriting the textfile with output what we get!

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ttyrec

TTYREC(1)						      General Commands Manual							 TTYREC(1)

NAME

       ttyrec - a tty recorder

SYNOPSIS

       ttyrec [-a] [-u] [-e command] [file]

DESCRIPTION

       Ttyrec  is a tty recorder.  It is a derivative of script(1) command for recording timing information with microsecond accuracy as well.	It
       can record emacs -nw, vi, lynx, or any programs running on tty.

       Ttyrec invokes a shell and records the session until the shell exits.  Recorded data can be played back with ttyplay(1).  If  the  argument
       file is given, the session will be recorded in that file.  Otherwise, ttyrecord is used as default.

OPTIONS

       -a     Append the output to file or ttyrecord, rather than overwriting it.

       -u     With  this  option, ttyrec automatically calls uudecode(1) and saves its output when uuencoded data appear on the session.  It allow
	      you to transfer files from remote host.  You can call ttyrec with this option, login to the remote host and invoke uuencode(1) on it
	      for the file you want to transfer.

       -e command
	      Invoke command when ttyrec starts.

ENVIRONMENT

       SHELL  If  the  variable SHELL exists, the shell forked by ttyrec will be that shell.  If it's not set, the Bourne shell is assumed.  (Most
	      shells set this variable automatically).

SEE ALSO

       script(1), ttyplay(1), ttytime(1), uuencode(1), uudecode(1)

																	 TTYREC(1)

Shell Programming and Scripting