29da75477b
reads eating 100% CPU. Fix this by skipping select on STDIN after reading EOF -- permanently if STDIN is not terminal and for one second if it is. Also after reading EOF from STDIN we have to pass it to the program being scripted. The previous approach was to write zero bytes into the pseudo-terminal. This does not work because zero-byte write does not have any effect on read. Fix this by sending VEOF instead. Submitted by: Ronald Klop <ronald-freebsd8@klop.yi.org> Discussed with: kib, Chris Torek <chris.torek@gmail.com> Approved by: kib MFC after: 1 week
178 lines
4.6 KiB
Groff
178 lines
4.6 KiB
Groff
.\" Copyright (c) 1980, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)script.1 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
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.Dd January 22, 2004
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.Dt SCRIPT 1
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.Os
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.Sh NAME
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.Nm script
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.Nd make typescript of terminal session
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.Sh SYNOPSIS
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.Nm
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.Op Fl akq
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.Op Fl t Ar time
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.Op Ar file Op Ar command ...
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.Sh DESCRIPTION
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The
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.Nm
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utility makes a typescript of everything printed on your terminal.
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It is useful for students who need a hardcopy record of an interactive
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session as proof of an assignment, as the typescript file
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can be printed out later with
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.Xr lpr 1 .
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.Pp
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If the argument
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.Ar file
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is given,
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.Nm
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saves all dialogue in
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.Ar file .
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If no file name is given, the typescript is saved in the file
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.Pa typescript .
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.Pp
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If the argument
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.Ar command
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is given,
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.Nm
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will run the specified command with an optional argument vector
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instead of an interactive shell.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl a
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Append the output to
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.Ar file
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or
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.Pa typescript ,
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retaining the prior contents.
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.It Fl k
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Log keys sent to program as well as output.
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.It Fl q
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Run in quiet mode, omit the start and stop status messages.
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.It Fl t Ar time
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Specify time interval between flushing script output file.
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A value of 0
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causes
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.Nm
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to flush for every character I/O event.
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The default interval is
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30 seconds.
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.El
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.Pp
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The script ends when the forked shell (or command) exits (a
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.Em control-D
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to exit
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the Bourne shell
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.Pf ( Xr sh 1 ) ,
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and
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.Em exit ,
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.Em logout
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or
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.Em control-D
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(if
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.Em ignoreeof
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is not set) for the
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C-shell,
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.Xr csh 1 ) .
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.Pp
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Certain interactive commands, such as
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.Xr vi 1 ,
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create garbage in the typescript file.
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The
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.Nm
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utility works best with commands that do not manipulate the screen.
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The results are meant to emulate a hardcopy terminal, not an addressable one.
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.Sh ENVIRONMENT
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The following environment variables are utilized by
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.Nm :
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.Bl -tag -width SHELL
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.It Ev SCRIPT
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The
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.Ev SCRIPT
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environment variable is added to the sub-shell.
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If
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.Ev SCRIPT
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already existed in the users environment,
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its value is overwritten within the sub-shell.
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The value of
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.Ev SCRIPT
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is the name of the
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.Ar typescript
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file.
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.It Ev SHELL
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If the variable
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.Ev SHELL
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exists, the shell forked by
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.Nm
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will be that shell.
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If
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.Ev SHELL
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is not set, the Bourne shell
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is assumed.
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(Most shells set this variable automatically).
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.El
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.Sh SEE ALSO
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.Xr csh 1
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(for the
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.Em history
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mechanism).
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 3.0 .
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.Sh BUGS
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The
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.Nm
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utility places
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.Sy everything
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in the log file, including linefeeds and backspaces.
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This is not what the naive user expects.
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.Pp
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It is not possible to specify a command without also naming the script file
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because of argument parsing compatibility issues.
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.Pp
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When running in
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.Fl k
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mode, echo cancelling is far from ideal.
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The slave terminal mode is checked
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for ECHO mode to check when to avoid manual echo logging.
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This does not
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work when in a raw mode where the program being run is doing manual echo.
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.Pp
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If the
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.Nm
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reads zero bytes from the terminal it switches to a mode when it probes read
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only once a second until it gets some data.
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This prevents the
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.Nm
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spinning on zero-byte reads, but might cause a 1-second delay in
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processing of the user input.
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