xref: /freebsd/usr.bin/script/script.1 (revision 29da75477bd86b4efa5afb5fe9c131ad86099bf7)

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.\"	@(#)script.1	8.1 (Berkeley) 6/6/93
.\" $FreeBSD$
.\"
.Dd January 22, 2004
.Dt SCRIPT 1
.Os
.Sh NAME
.Nm script
.Nd make typescript of terminal session
.Sh SYNOPSIS
.Nm
.Op Fl akq
.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 k
Log keys sent to program as well as output.
.It Fl q
Run in quiet mode, omit the start and stop status messages.
.It Fl t Ar time
Specify time interval between flushing script output file.
A value of 0
causes
.Nm
to flush for 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.
(Most shells set this variable automatically).
.El
.Sh SEE ALSO
.Xr csh 1
(for the
.Em history
mechanism).
.Sh HISTORY
The
.Nm
command appeared in
.Bx 3.0 .
.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 in a raw mode where the program being run is doing manual echo.
.Pp
If the
.Nm
reads zero bytes from the terminal it switches to a mode when it probes read
only once a second until it gets some data.
This prevents the
.Nm
spinning on zero-byte reads, but might cause a 1-second delay in
processing of the user input.