206 lines
6.7 KiB
Groff
206 lines
6.7 KiB
Groff
.\" Copyright (c) 1980, 1990 Regents of the University of California.
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.\" 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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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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 6.5 (Berkeley) 7/27/91
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.\"
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.TH SCRIPT "1" "June 2014" "util-linux" "User Commands"
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.SH NAME
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script \- make typescript of terminal session
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.SH SYNOPSIS
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.B script
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[options]
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.RI [ file ]
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.SH DESCRIPTION
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.B script
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makes a typescript of everything displayed on your terminal. It is useful for
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students who need a hardcopy record of an interactive session as proof of an
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assignment, as the typescript file can be printed out later with
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.BR lpr (1).
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.PP
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If the argument
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.I file
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is given,
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.B script
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saves the dialogue in this
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.IR file .
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If no filename is given, the dialogue is saved in the file
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.BR typescript .
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.SH OPTIONS
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Below, the \fIsize\fR argument may be followed by the multiplicative
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suffixes KiB (=1024), MiB (=1024*1024), and so on for GiB, TiB, PiB, EiB, ZiB and YiB
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(the "iB" is optional, e.g. "K" has the same meaning as "KiB"), or the suffixes
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KB (=1000), MB (=1000*1000), and so on for GB, TB, PB, EB, ZB and YB.
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.TP
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\fB\-a\fR, \fB\-\-append\fR
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Append the output to
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.I file
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or to
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.BR typescript ,
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retaining the prior contents.
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.TP
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\fB\-c\fR, \fB\-\-command\fR \fIcommand\fR
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Run the
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.I command
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rather than an interactive shell. This makes it easy for a script to capture
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the output of a program that behaves differently when its stdout is not a
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tty.
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.TP
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\fB\-e\fR, \fB\-\-return\fR
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Return the exit code of the child process. Uses the same format as bash
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termination on signal termination exit code is 128+n. The exit code of
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the child process is always stored in type script file too.
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.TP
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\fB\-f\fR, \fB\-\-flush\fR
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Flush output after each write. This is nice for telecooperation: one person
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does `mkfifo foo; script -f foo', and another can supervise real-time what is
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being done using `cat foo'.
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.TP
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\fB\-\-force\fR
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Allow the default output destination, i.e. the typescript file, to be a hard
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or symbolic link. The command will follow a symbolic link.
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.TP
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\fB\-o\fR, \fB\-\-output-limit\fR \fIsize\fR
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Limit the size of the typescript and timing files to
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.I size
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and stop the child process after this size is exceeded. The calculated
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file size does not include the start and done messages that the
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.B script
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command prepends and appends to the child process output.
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Due to buffering, the resulting output file might be larger than the specified value.
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.TP
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\fB\-q\fR, \fB\-\-quiet\fR
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Be quiet (do not write start and done messages to standard output).
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.TP
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\fB\-t\fR[\fIfile\fR], \fB\-\-timing\fR[=\fIfile\fR]
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Output timing data to standard error, or to
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.I file
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when given. This data contains two fields, separated by a space. The first
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field indicates how much time elapsed since the previous output. The second
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field indicates how many characters were output this time. This information
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can be used to replay typescripts with realistic typing and output delays.
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.TP
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\fB\-V\fR, \fB\-\-version\fR
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Display version information and exit.
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.TP
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\fB\-h\fR, \fB\-\-help\fR
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Display help text and exit.
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.SH NOTES
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The script ends when the forked shell exits (a
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.I control-D
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for the Bourne shell
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.RB ( sh (1)),
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and
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.IR exit ,
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.I logout
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or
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.I control-d
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(if
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.I ignoreeof
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is not set) for the
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C-shell,
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.BR csh (1)).
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.PP
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Certain interactive commands, such as
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.BR vi (1),
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create garbage in the typescript file.
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.B script
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works best with commands that do not manipulate the screen, the results are
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meant to emulate a hardcopy terminal.
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.PP
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It is not recommended to run
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.B script
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in non-interactive shells. The inner shell of
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.B script
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is always interactive, and this could lead to unexpected results. If you use
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.B script
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in the shell initialization file, you have to avoid entering an infinite
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loop. You can use for example the \fB\%.profile\fR file, which is read
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by login shells only:
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.RS
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.RE
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.sp
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.na
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.RS
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.nf
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if test -t 0 ; then
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script
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exit
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fi
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.fi
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.RE
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.ad
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.PP
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You should also avoid use of script in command pipes, as
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.B script
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can read more input than you would expect.
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.PP
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.SH ENVIRONMENT
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The following environment variable is utilized by
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.BR script :
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.TP
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.B SHELL
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If the variable
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.B SHELL
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exists, the shell forked by
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.B script
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will be that shell. If
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.B SHELL
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is not set, the Bourne shell is assumed. (Most shells set this variable
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automatically).
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.SH SEE ALSO
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.BR csh (1)
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(for the
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.I history
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mechanism),
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.BR scriptreplay (1)
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.SH HISTORY
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The
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.B script
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command appeared in 3.0BSD.
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.SH BUGS
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.B script
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places
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.I everything
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in the log file, including linefeeds and backspaces. This is not what the
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naive user expects.
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.PP
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.B script
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is primarily designed for interactive terminal sessions. When stdin
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is not a terminal (for example: \fBecho foo | script\fR), then the session
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can hang, because the interactive shell within the script session misses EOF and
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.B script
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has no clue when to close the session. See the \fBNOTES\fR section for more information.
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.SH AVAILABILITY
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The script command is part of the util-linux package and is available from
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.UR https://\:www.kernel.org\:/pub\:/linux\:/utils\:/util-linux/
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Linux Kernel Archive
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.UE .
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