Index: head/usr.bin/script/script.1
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--- head/usr.bin/script/script.1	(revision 365052)
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 .\"	@(#)script.1	8.1 (Berkeley) 6/6/93
 .\" $FreeBSD$
 .\"
-.Dd December 4, 2013
+.Dd September 1, 2020
 .Dt SCRIPT 1
 .Os
 .Sh NAME
 .Nm script
 .Nd make typescript of terminal session
 .Sh SYNOPSIS
 .Nm
 .Op Fl adefkpqr
 .Op Fl F Ar pipe
 .Op Fl t Ar time
 .Op Ar file Op Ar command ...
 .Sh DESCRIPTION
 The
 .Nm
 utility makes a typescript of everything printed on your terminal.
 It is useful for students who need a hardcopy record of an interactive
 session as proof of an assignment, as the typescript file
 can be printed out later with
 .Xr lpr 1 .
 .Pp
 If the argument
 .Ar file
 is given,
 .Nm
 saves all dialogue in
 .Ar file .
 If no file name is given, the typescript is saved in the file
 .Pa typescript .
 .Pp
 If the argument
 .Ar command
 is given,
 .Nm
 will run the specified command with an optional argument vector
 instead of an interactive shell.
 .Pp
 The following options are available:
 .Bl -tag -width indent
 .It Fl a
 Append the output to
 .Ar file
 or
 .Pa typescript ,
 retaining the prior contents.
 .It Fl d
 When playing back a session with the
 .Fl p
 flag, do not sleep between records when playing back a timestamped session.
 .It Fl e
 Accepted for compatibility with
 .Em util-linux
 .Nm .
 The child command exit status is always the exit status of
 .Nm .
 .It Fl F Ar pipe
 Immediately flush output after each write.
 This will allow a user to create a named pipe using
 .Xr mkfifo 1
 and another user may watch the live session using a utility like
 .Xr cat 1 .
 .It Fl f
 Create
 .Ar file.filemon
 or
 .Pa typescript.filemon
 using
 .Xr filemon 4 .
 .It Fl k
 Log keys sent to the program as well as output.
 .It Fl p
 Play back a session recorded with the
 .Fl r
 flag in real time.
 .It Fl q
 Run in quiet mode, omit the start, stop and command status messages.
 .It Fl r
 Record a session with input, output, and timestamping.
 .It Fl t Ar time
 Specify the interval at which the script output file will be flushed
 to disk, in seconds.
 A value of 0
 causes
 .Nm
 to flush after every character I/O event.
 The default interval is
 30 seconds.
 .El
 .Pp
 The script ends when the forked shell (or command) exits (a
 .Em control-D
 to exit
 the Bourne shell
 .Pf ( Xr sh 1 ) ,
 and
 .Em exit ,
 .Em logout
 or
 .Em control-D
 (if
 .Em ignoreeof
 is not set) for the
 C-shell,
 .Xr csh 1 ) .
 .Pp
 Certain interactive commands, such as
 .Xr vi 1 ,
 create garbage in the typescript file.
 The
 .Nm
 utility works best with commands that do not manipulate the screen.
 The results are meant to emulate a hardcopy terminal, not an addressable one.
 .Sh ENVIRONMENT
 The following environment variables are utilized by
 .Nm :
 .Bl -tag -width SHELL
 .It Ev SCRIPT
 The
 .Ev SCRIPT
 environment variable is added to the sub-shell.
 If
 .Ev SCRIPT
 already existed in the users environment,
 its value is overwritten within the sub-shell.
 The value of
 .Ev SCRIPT
 is the name of the
 .Ar typescript
 file.
 .It Ev SHELL
 If the variable
 .Ev SHELL
 exists, the shell forked by
 .Nm
 will be that shell.
 If
 .Ev SHELL
 is not set, the Bourne shell
 is assumed.
 .Pq Most shells set this variable automatically .
 .El
 .Sh SEE ALSO
 .Xr csh 1
 .Po
 for the
 .Em history
 mechanism
 .Pc ,
 .Xr filemon 4
 .Sh HISTORY
 The
 .Nm
 command appeared in
 .Bx 3.0 .
 .Pp
 The
 .Fl d ,
 .Fl p
 and
 .Fl r
 options first appeared in
 .Nx 2.0
 and were ported to
 .Fx 9.2 .
 .Sh BUGS
 The
 .Nm
 utility places
 .Sy everything
 in the log file, including linefeeds and backspaces.
 This is not what the naive user expects.
 .Pp
 It is not possible to specify a command without also naming the script file
 because of argument parsing compatibility issues.
 .Pp
 When running in
 .Fl k
 mode, echo cancelling is far from ideal.
 The slave terminal mode is checked
 for ECHO mode to check when to avoid manual echo logging.
 This does not
 work when the terminal is in a raw mode where
 the program being run is doing manual echo.
 .Pp
 If
 .Nm
 reads zero bytes from the terminal, it switches to a mode when it
 only attempts to read
 once a second until there is data to read.
 This prevents
 .Nm
 from spinning on zero-byte reads, but might cause a 1-second delay in
 processing of user input.