12-19-2007
[Note to the people running this website: I received the following email over a day ago that someone responded to my original posting. And yet, it has never appeared here! I always see just 0 replies. Whats up? Is this website buggy?
When I try clicking on the "Contact us" link on the bottom of the page, I get an "Invalid Forum specified" error message, and when I try to click on the administrator link within that error message I get the same error message again.
If someone reading this knows how to contact the technical people running this website to notify them of these bugs, I would be grateful.
Since my posts do seem to be appearing on these forums, I am going to copy the text of the email that was sent to me and paste it below:]
ok, since you have gone to the trouble to post this, I will give some feedback which would make this more usable/portable. Currently it will not work on a stricter POSIX implementation of Unix due to your use of extented option from GNU find.
1. Your set -u is doing nothing at all since you have defaults for the only variables you use.
2. Use either a variable set to the full path (preferable) for a full path to programs you run.
eg
Code:
---------
FIND=/usr/bin/find
...
$FIND $opt_p $opt_R -type f -iname "*.sh"...
---------
3. Use POSIX arguments to find, it takes more work but is portable.
4. Instead of saying that the script will exit, print a usage message, you have that in the comments, but a usage message is better.
As an improvement, instead of assuming bourne/bourne compatability, test for a magic number in the first line of the script and run the <script interpreter> -n based on that, if there is none, then by all means default to using bourne.
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SCRIPT(1) User Commands SCRIPT(1)
NAME
script - make typescript of terminal session
SYNOPSIS
script [options] [file]
DESCRIPTION
script makes a typescript of everything displayed 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 lpr(1).
If the argument file is given, script saves the dialogue in this file. If no filename is given, the dialogue is saved in the file type-
script.
OPTIONS
-a, --append
Append the output to file or to typescript, retaining the prior contents.
-c, --command command
Run the command rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves
differently when its stdout is not a tty.
-e, --return
Return the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n.
-f, --flush
Flush output after each write. This is nice for telecooperation: one person does `mkfifo foo; script -f foo', and another can
supervise real-time what is being done using `cat foo'.
--force
Allow the default output destination, i.e. the typescript file, to be a hard or symbolic link. The command will follow a symbolic
link.
-q, --quiet
Be quiet (do not write start and done messages to standard output).
-t[file], --timing[=file]
Output timing data to standard error, or to file when given. This data contains two fields, separated by a space. The first field
indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time.
This information can be used to replay typescripts with realistic typing and output delays.
-V, --version
Display version information and exit.
-h, --help
Display help text and exit.
NOTES
The script ends when the forked shell exits (a control-D for the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not
set) for the C-shell, csh(1)).
Certain interactive commands, such as vi(1), create garbage in the typescript file. script works best with commands that do not manipulate
the screen, the results are meant to emulate a hardcopy terminal.
It is not recommended to run script in non-interactive shells. The inner shell of script is always interactive, and this could lead to
unexpected results. If you use script in the shell initialization file, you have to avoid entering an infinite loop. You can use for
example the .profile file, which is read by login shells only:
if test -t 0 ; then
script
exit
fi
You should also avoid use of script in command pipes, as script can read more input than you would expect.
ENVIRONMENT
The following environment variable is utilized by script:
SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed.
(Most shells set this variable automatically).
SEE ALSO
csh(1) (for the history mechanism), scriptreplay(1)
HISTORY
The script command appeared in 3.0BSD.
BUGS
script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects.
script is primarily designed for interactive terminal sessions. When stdin is not a terminal (for example: echo foo | script), then the
session can hang, because the interactive shell within the script session misses EOF and script has no clue when to close the session. See
the NOTES section for more information.
AVAILABILITY
The script command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils
/util-linux/>.
util-linux June 2014 SCRIPT(1)