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----Transcript of message follows----
Date: 19 Aug 90 05:22:00 MDT
From: info-unix at BRL.MIL
Subject: INFO-UNIX Digest V10#121
To: "jnjortn" <jnjortn at ceratiidae.cs.sandia.gov>
Return-Path: <incoming-info-unix-request at sandia.gov>
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From: The Moderator (Mike Muuss) <Info-Unix-Request at BRL.MIL>
To: INFO-UNIX at BRL.MIL
Reply-To: INFO-UNIX at BRL.MIL
Subject: INFO-UNIX Digest V10#121
Message-ID: <9008190545.aa18786 at SEM.BRL.MIL>
INFO-UNIX Digest Sun, 19 Aug 1990 V10#121
Today's Topics:
Minix UUCP/MAIL Permissions
Re: get terminal speed from shell script
sh -c /usr/ucb/csh -c SCRIPT causes sys ?degradation?
Re: Converting to uppercase/lowercase in sed
Funny kill -9 behaviour
Re: Funny kill -9 behaviour
Re: Recursion without -R
Re: 8mm Reliability
Thanks for the info on mailx docs.
Re: non-interactine telnet session
USENIX FaceSaver pix
Re: extracting files from a tar file
Re: Mail Delivery Problem
Re: Adding on to the history mechanism
How to flush tty input (was Re: Problems with DIGIBOARD PC/4)
Re: sort with a tab as separator
style, diction: anyone use them
-----------------------------------------------------------------
From: Phi-Ho Hoang <root at insearch.cam.org>
Subject: Minix UUCP/MAIL Permissions
Date: 15 Aug 90 18:52:01 GMT
Return-Path: <InSearch.CAM.ORG!root>
X-Mailer: W-MAIL 3.4/MINIX (05/14/90)
To: info-unix at sem.brl.mil
Hi,
I am trying to set up UUCP under Minix. I have been using uucico
manually to send and receive mail because when I put uucico in
crontab, lmail complains about permission problem and the result
is that the mail box is always empty. Anything received in
/usr/spool/uucp is just deleted.
Please email me a typical setting of modes, ownerships, setuid's
and setgid's for the files and directories in use for UUCP and MAIL.
Thank you in advance.
Phi-Ho Hoang.
-----
root at InSearch.CAM.ORG InSearch - For a better Solution
uunet!philmtl!altitude!InSearch.CAM.ORG!root
-----------------------------
From: Paul Lew <lew at gsg.uucp>
Subject: Re: get terminal speed from shell script
Date: 16 Aug 90 00:43:03 GMT
To: info-unix at sem.brl.mil
bob at wyse.wyse.com (Bob McGowen x4312 dept208) writes:
>In article <90Aug12.135618edt.18763 at me.utoronto.ca> sun at hammer.me.UUCP (Andy Sun Anu-guest) writes:
> >Is there a way to get the terminal speed from a (sh or csh) script?
>Of course, this is the Bourne shell, not csh. I cannot vouch for how or if
>this is possible with csh.
Try: set speed = `(stty speed > /dev/tty) |& cat`
Layers of I/O redirections usually can solve these kind of problems.
--
Paul Lew (lew at gsg.gsg.com) UUCP: oliveb---+
uunet---samsung--+
General Systems Group, 5 Manor Parkway harvard--+--gsg--lew
Salem, NH 03079 (603) 893-1000 decvax---+
-----------------------------
From: Paul Gladden <paulg at smokey.sandiego.ncr.com>
Subject: sh -c /usr/ucb/csh -c SCRIPT causes sys ?degradation?
Date: 17 Aug 90 16:36:08 GMT
Sender: news at iss-rb.sandiego.ncr.com
To: info-unix at sem.brl.mil
We are currently developing a application monitoring daemon.
When the daemon detects various application milestones it takes
an appropriate action. One potential action is to execute a user
supplied shell script. I constructed a two line shell script to
log the execution into a log file. Problem is the shell script
executes for minutes. Several shell scripts executing cause
system performance to nose dive.
The daemon executes the shell script via a fork() and system() function
call. We were prepending the user defined shell from $SHELL into
the system() call
ie. system("-c \"/usr/ucb/csh -c SCRIPT arg1 arg2 arg3 arc4\"");.
I removed the user shell from being passed to the
system() function. This masks the problem, not solving the
root cause.
The shell script:
echo `date` >> test.log
echo "SMFsh: process action.\n Info = \"$*\"\n" >> test.log
The processes in ?error? are preceded by '>'
paulg 665 593 0 11:47:22 ttyx013 1:07 stress -c10000
root 661 1 0 11:46:14 ? 1:03 /etc/sysmond
paulg 769 661 0 11:54:44 ? 0:00 /etc/sysmond
paulg 689 661 0 11:47:53 ? 0:00 /etc/sysmond
paulg 690 689 0 11:47:53 ? 0:00 sh -c /usr/ucb/csh -c "./SMFsh /
> paulg 691 690 1 11:47:53 ? 0:34 /usr/ucb/csh -c ./SMFsh /test/na
paulg 770 769 0 11:54:48 ? 0:00 sh -c /usr/ucb/csh -c "./SMFsh /
> paulg 771 770 0 11:54:49 ? 0:55 /usr/ucb/csh -c ./SMFsh /test/na
paulg 703 661 0 11:48:13 ? 0:00 /etc/sysmond
paulg 704 703 0 11:48:13 ? 0:00 sh -c /usr/ucb/csh -c "./SMFsh /
> paulg 705 704 0 11:48:13 ? 0:53 /usr/ucb/csh -c ./SMFsh /test/na
paulg 734 661 0 11:49:28 ? 0:00 /etc/sysmond
paulg 736 734 0 11:49:28 ? 0:00 sh -c /usr/ucb/csh -c "./SMFsh /
> paulg 737 736 1 11:49:30 ? 2:16 /usr/ucb/csh -c ./SMFsh /test/na
system: MC680020 Unix 5.3
1. What would cause a two line shell to execute for an excessive period of
time?
2. Has anyone encountered this problem before?
Paul Gladden NCR CORPORATION E&M San Diego
paulg at smokey.sandiego.ncr.com 16650 West Bernardo Drive
ucsd!ivory!smokey!paulg San Diego, Ca. 92128
(619) 485-2716 #include <std/disclaimer.h>
-----------------------------
From: Dan_Jacobson at att.com
Subject: Re: Converting to uppercase/lowercase in sed
Date: 17 Aug 90 22:03:08 GMT
Sender: Dan Jacobson <danj1 at cbnewse.att.com>
To: info-unix at sem.brl.mil
merlyn at iwarp.intel.com (Randal Schwartz) writes:
>yeah, the not very well documented "y" command.
> y/a-z/A-Z/
bzzzzt. Minus 10 points! got to say:
y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/
--
Dan_Jacobson at ATT.COM +1-708-979-6364
-----------------------------
From: Jim Harkins <jharkins at sagpd1.uucp>
Subject: Funny kill -9 behaviour
Date: 17 Aug 90 23:37:48 GMT
To: info-unix at sem.brl.mil
Due to inattention on my part I managed to create a bunch of processes I
needed to kill. Rather than typing 'kill -9 number-list', I tried:
kill -9 `ps -aug | grep ekg | awk '{print $2}'`
To which I was rewarded with
`ps -aug | grep ekg | awk '{print $2}'`: ambiguous.
After playing around a bit I realized the problem lay with the kill -9,
by replacing it with echo I got a list of process numbers. I redirected
the ps ... awk output into foo, then tried
kill -9 `cat foo`
and got
`cat foo`: ambiguous.
What I want to know is why in the hay does this happen? FYI, I killed the
turkeys with a foreach i (`cat foo`) loop in which I kill -9'd the $i's.
Also, I'm on a Sun running 4.3 bsd.
--
jim jharkins at sagpd1
Iraqnophobia! The talk of the Middle East. Coming soon to a theatre of war
near you.
-----------------------------
From: Guy Harris <guy at auspex.auspex.com>
Subject: Re: Funny kill -9 behaviour
Date: 18 Aug 90 21:27:07 GMT
To: info-unix at sem.brl.mil
>What I want to know is why in the hay does this happen?
Because the C shell is flakier than a snowstorm. To quote the BUGS
section of the SunOS 4.0.3 manual page (this quote is also in the S5R4
"csh" manual page):
Although robust enough for general use, adventures into the
esoteric periphery of the C shell may reveal unexpected
quirks.
which translates as "the C shell is flakier than a snowstorm."
Try doing "/usr/bin/kill `cat /tmp/foo`" instead. "kill" is a C shell
builtin; somehow, for *some* but not *all* builtins, that construct
seems to confuse the shell. Using the non-built-in "kill" seemed to
make the problem go away, at least when I tried it.
-----------------------------
From: Chris Torek <chris at mimsy.umd.edu>
Subject: Re: Funny kill -9 behaviour
Date: 18 Aug 90 23:11:28 GMT
To: info-unix at sem.brl.mil
In various articles various people ask why
kill -9 `some expression`
produces
`some expression`: Ambiguous
The reason is that kill is a C-shell built-in, these people are using
the C-shell, and the C-shell is (to an amazingly large extent, given
that it `works' for most uses) quite thoroughly broken inside. The
kill code expands the backquote expression, finds that it breaks into
several words, and complains (instead of iterating over each of the
words). This does not happen with
kill -9 several words
because here the expansion occurs before the built-in kill function.
Note that kill *must* be a built-in, since `kill %2' has to convert the
`%2' to a `job' (and %n does not normally expand to a list of process
IDs, which is the obvious way to do this without a built-in).
So: workarounds:
eval kill arguments `expression`
/bin/kill arguments `expression`
The latter runs one more process, does not interpret `%'s, and is
dependent on the location of the `kill' program. The former simply
causes the backquote expression to be expanded before calling the
internal `kill' routine.
--
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain: chris at cs.umd.edu Path: uunet!mimsy!chris
(New campus phone system, active sometime soon: +1 301 405 2750)
-----------------------------
From: Stefan Hauser <etienne at accsys.ccs.imp.com>
Subject: Re: Recursion without -R
Keywords: recursion
Date: 17 Aug 90 23:51:52 GMT
To: info-unix at sem.brl.mil
In article <13595 at ulysses.att.com> swfc at ulysses.att.com (Shu-Wie F Chen) writes:
>In article <494 at llnl.LLNL.GOV>, rjshaw at ramius.ocf.llnl.gov (Robert Shaw)
>writes:
>|>What are some quick tricks for getting programs like chmod and chown to
>|>descend into all subdirectories? Programs without a -R option, that is.
>>find . -print | xargs chown foo
how about :
find . -exec chown foo {} \;
i think that should work on all systems, or not ?
stefan
--
Stefan Hauser | CH-Sargans | EMAIL : etienne at accsys.ccs.imp.com
-----------------------------
From: phd_ivo at gsbvxb.uchicago.edu
Subject: Re: 8mm Reliability
Date: 18 Aug 90 07:06:31 GMT
Sender: News Administrator <news at midway.uchicago.edu>
To: info-unix at sem.brl.mil
In article <1990Aug16.161652.21233 at tijc02.uucp>, cgh018 at tijc02.uucp (Calvin Hayden x2254) writes...
>How do they compare to 1/2" 9 track, or 1/4" QIC for a purpose
>such as this.
I also missed the discussion, and am interested in this issue. How probable is
it that at least one bit is lost irrecoverably after 2 years from a whole tape?
How do the 8mm tapes compare to DAT tapes? And what is the best price/source for
either?
Thanks for any notes...
/ivo welch ivo at next.agsm.ucla.edu
-----------------------------
From: Jeff Stuart <jstuart at kentvax.kent.edu>
Subject: Thanks for the info on mailx docs.
Date: 18 Aug 90 07:42:00 GMT
Sender: jstuart at kentvax.kent.edu
Distribtion: world
To: info-unix at sem.brl.mil
Thanks everyone for the info on mailx. If anyone is interested let me
know and I'll send you a summary through email.
Jeff Stuart Internet: kentba!jstuart at math-cs.kent.edu
Kent State University UUCP : uunet!teleng!telxon!kentba!jstuart
Kent, Ohio 44449 (216) 672-3282
#include std.disclaimer
--
Jeff Stuart Internet: kentba!jstuart at math-cs.kent.edu
Kent State University UUCP : uunet!teleng!telxon!kentba!jstuart
Kent, Ohio 44449 (216) 672-3282
#include std.disclaimer
-----------------------------
From: WATANABE Katsuhiro <katsu at sra.co.jp>
Subject: Re: non-interactine telnet session
Date: 18 Aug 90 08:57:59 GMT
Sender: news at sran124.sra.co.jp
To: info-unix at sem.brl.mil
In article <1995 at xn.LL.MIT.EDU> healey at XN.LL.MIT.EDU (Joseph T. Healey) writes:
> Is there any way to invoke a non-interactive telnet session
> via a script (preferably csh or sh) ?
>
> We would like the script to:
>
> log into the target machine
> run an arbitrary number of commands listed in the script
> log out of the target machine
If we are able to pipe from/into "telnet", you know the rest.
When you send command-lines to telnet(to shell of remote site) through
pipe, time intervals need to be put between the lines. Naturally, we
should wait for prompts. But it is too hard to do in sh/csh. So...
how about sleeping?
#!/bin/sh
remotehost="srava"
loginname="katsu"
password="neverpeek"
(sleep 10
echo "$loginname"; sleep 2
echo "$password"; sleep 10
echo "date"; sleep 2
echo "ls -l"; sleep 3
echo "bc"; sleep 1
echo "for (i = 0; i < 100; i++) j = i * i"; sleep 1
echo "j"; sleep 1
echo "quit"; sleep 1
echo "exit") | telnet "$remotehost"
You may add other pipes to last line.
Caution:
1. I strongly discourage from using script like this, because it contains
the password as plain text. You ought to rewrite it to ask password each
start up time, if possible.
2. There is no assurance that it works every time. For example, the first
sleeping interval(`sleep 10' in my example) was too short to come up
login prompt, it would fail to login. Anyway, it is tiresome to tune
intervals after each command invoking.
----____----____
WATANABE Katsuhiro Software Research Associates, Inc. Japan.
Not execute, but evaluate.
-----------------------------
From: Robert Shaw <rjshaw at ramius.ocf.llnl.gov>
Subject: USENIX FaceSaver pix
Date: 18 Aug 90 12:19:04 GMT
Sender: usenet at llnl.llnl.gov
To: info-unix at sem.brl.mil
Hello, USENIX types...
Are the FaceSaver pictures from the last conference (Anaheim) on
the net yet? I can't find myself in faces/<my-hostname>....
<my-hostname> ::= lll-lcc.llnl.gov Just in case somewhere out there
knows a secret place to look for
shaw.Z
Thanx...
===============================================================================
rjshaw at ramius.llnl.gov
_____ ____ ____ ______
R o b / / / / / / / / / / /
-------- / --/ / / / / / / / / / ---------------------------
/-- / / / / / / / / S h a w
/____/ /_/_/ /_/_/ /_____/
The Cosby's are precisely what's wrong with television today...
===============================================================================
-----------------------------
From: "Deven T. Corzine" <deven at rpi.edu>
Subject: Re: extracting files from a tar file
Date: 18 Aug 90 16:13:35 GMT
To: info-unix at sem.brl.mil
> I have a faculty member who has brought a tape with him from a
> different site. It is a tar tape and the files were stored using
> absolute pathnames. The difficulty is that we don't have the same
> file structure names and so when I would try to restore the files,
> it fills up the root file structure quickly (we don't keep a whole
> lot of space available in that partition).
> I was wondering if there are any PD programs that exist or whether
> someone has written a script to get around this problem. I could
> write a script to extract a file at a time and then move it but its
> a hassle trying to maintain the directory structure that the faculty
> member has and preserve modification dates. I've also considered
> writing a C program using the chroot function and doing a system
> call to tar but that seems messy too.
Yes, I have written a Perl script to do exactly this. It uses the
chroot(2) call, and must run setuid root, but it will setuid back to
the real uid after performing the chroot. It appears fairly secure,
and it does work. The only real thing you need to be sure of is that
tar(1) will run standalone, with NO system libraries available.
I wrote and tested the script under SunOS 4.0.3 using Perl 3.0; Sun's
/bin/tar does indeed work standalone (doesn't need the shared
libraries) so it works. If you have a dynamically compiled one, you
might have to statically link it for it to work. The suidperl program
is needed to execute the script, but it is in memory when running, so
it doesn't need the ability to run standalone. Enough caveats; here's
the script. [Can anyone think of a good name for it?]
----
#!/usr/local/bin/suidperl
if ($#ARGV != 1) {
print STDERR "Usage: $0 <tarfile> <dir>\n";
exit 1;
}
$ENV{'PATH'} = '/bin:/usr/bin';
$tar = $ARGV[0];
$ARGV[1] =~ /(\w+)$/;
$dir = $1;
if (! -f $tar) {
print STDERR "Error: tar file does not exist.\n";
exit 1;
}
if (-e $dir) {
print STDERR "Error: directory must not exist.\n";
exit 1;
}
if (! -W ".") {
print STDERR "Error: No write permission on current directory.\n";
exit 1;
}
mkdir($dir,0777);
chown $<,$(,$dir;
system "/bin/cp","/bin/tar",$dir;
system "/bin/cp",$tar,"$dir/absolute.tar";
chdir $dir;
chroot ".";
($>,$)) = ($<,$();
system "./tar","-xvf","absolute.tar";
unlink "tar";
unlink "absolute.tar";
exit 0;
----
Have fun.
Deven
--
Deven T. Corzine Internet: deven at rpi.edu, shadow at pawl.rpi.edu
Snail: 2214 12th St. Apt. 2, Troy, NY 12180 Phone: (518) 271-0750
Bitnet: deven at rpitsmts, userfxb6 at rpitsmts UUCP: uunet!rpi!deven
Simple things should be simple and complex things should be possible.
--
Deven T. Corzine Internet: deven at rpi.edu, shadow at pawl.rpi.edu
Snail: 2214 12th St. Apt. 2, Troy, NY 12180 Phone: (518) 271-0750
Bitnet: deven at rpitsmts, userfxb6 at rpitsmts UUCP: uunet!rpi!deven
Simple things should be simple and complex things should be possible.
-----------------------------
From: "Alan H. Mintz" <alan at mq.uucp>
Subject: Re: Mail Delivery Problem
Date: 18 Aug 90 21:43:40 GMT
To: info-unix at sem.brl.mil
In article <24208 at adm.BRL.MIL>, postmaster at sandia.gov (SMTP MAILER) writes:
>
> ----Reason for mail failure follows----
> Sending mail to <jnjortn at ceratiidae.cs.sandia.gov> :
> Could not be delivered for three days.
>
> ----Transcript of message follows----
...followed by a trace and a copy of INFO-UNIX digest.
Am I missing something or should this bounce back to BRL.MIL, not this group ?
Seems like we see this a couple times a month.
--
< Alan H. Mintz | Voice +1 714 980 1034 >
< Micro-Quick Systems, Inc. | FAX +1 714 944 3995 >
< 10384 Hillside Road | uucp: ...!uunet!mq!alan >
< Alta Loma, CA 91701 USA | Internet: alan at MQ.COM >
-----------------------------
From: Art Neilson <art at pilikia.pegasus.com>
Subject: Re: Adding on to the history mechanism
Date: 18 Aug 90 19:40:16 GMT
To: info-unix at sem.brl.mil
In article <24882 at boulder.Colorado.EDU> anthony at lyra.Colorado.EDU (Anthony Veale) writes:
>Hello, world,
>
>I have a programming task that I set myself and I need a bit of advice on how
>to integrate this thing into my environment. Here's a brief on what I want to
>do.
>
>I want to add on to UNIX the only good thing that I have found under VMS.
>(My work forces my choice of operating system.) Namely, the VMS equivalent of
>the history mechanism. For those who aren't familiar with it, you type Up-
>arrows and Down-arrows to scroll through the history list and you can insert
>and delete characters anywhere on the command line.
Gee, sounds like ksh, or tcsh, or bash ... There *really* are shells available
which do command line editing. Why not just get one of them ???
--
Arthur W. Neilson III | ARPA: art at pilikia.pegasus.com
Bank of Hawaii Tech Support | UUCP: uunet!ucsd!nosc!pegasus!pilikia!art
-----------------------------
From: Guy Harris <guy at auspex.auspex.com>
Subject: How to flush tty input (was Re: Problems with DIGIBOARD PC/4)
Date: 18 Aug 90 22:02:05 GMT
Followup-To: comp.unix.questions
To: info-unix at sem.brl.mil
(Generic UNIX issue, not Xenix-specific)
>On a related topic, is there anyway to flush typeahead in Xenix?? I am
>using the Xenix equivalent of cbreak() (by setting various flags with
>ioctl()). fflush(stdin) doesn't seem to work, although it doesn't return
>an error code.
The term "flush" has, unfortunately, (at least) a couple of meanings.
(We shall ignore those such as "a hand of cards of the same suit", for
instance. :-))
It's used to mean "taking all buffered output on an output stream -
i.e., output that's been buffered up but not written to the file or
device - and writing it to the file or device".
It's also used to mean "taking all buffered input on an input stream and
throwing it away".
The first of those two meanings is the meaning of "flush" in "fflush".
*Some* C implementations will give it the second meaning in some sense
(S5R3 and some or all earlier S5 releases, I think), but others don't
(BSD). The ANSI C spec doesn't specify that, and older C language
"specifications" didn't either.
In addition, in the S5R3 implementation (and probably others that use it
to throw away input), it only throws away input that the C buffered I/O
routines (sometimes called the "standard I/O library") have buffered,
*NOT* input that, say, a device driver has buffered.
To throw away input that the terminal driver has buffered, you can, in
newer UNIXes, do:
ioctl(fd, TCFLSH, 0)
where "fd" is the file descriptor for the terminal. In this case, you
can do either "fileno(stdin)", or just 0 (which is almost certainly the
result of "fileno(stdin)", although if you work hard enough I think you
can make it non-zero - you probably haven't had any reason to do that,
though).
In older UNIXes, you may be able to use the TIOCFLUSH "ioctl", or may
have to do a TIOCGETP "ioctl" followed by a TIOCSETP "ioctl" with the
state from TIOCGETP. If your Xenix is other than a creaky old one, it
should have TCFLSH, though.
-----------------------------
From: Doug Gwyn <gwyn at smoke.brl.mil>
Subject: Re: sort with a tab as separator
Date: 19 Aug 90 02:22:15 GMT
To: info-unix at sem.brl.mil
In article <1990Aug17.185300.159 at midway.uchicago.edu> phd_ivo at gsbacd.uchicago.edu writes:
>I just figured out that it is my shell that actually translates tabs into
>spaces. So, now I need a way to quote a tab (no, quotation marks or
>backslash quoting don't work)...
So get a real shell:
$ echo ' ' | od -c
0000000 \t \n
0000002
$
-----------------------------
From: phd_ivo at gsbvxb.uchicago.edu
Subject: Re: sort with a tab as separator
Date: 19 Aug 90 04:09:28 GMT
Sender: News Administrator <news at midway.uchicago.edu>
To: info-unix at sem.brl.mil
In article <13617 at smoke.BRL.MIL>, gwyn at smoke.BRL.MIL (Doug Gwyn) writes...
+So get a real shell:
+ $ echo ' ' | od -c
+ 0000000 \t \n
On a NeXT improved csh (and presumably on some other shells), the following
works:
sort -t\^V^I
that is, the tab must be quoted twice: once with the backslash, and then with
the ^V (control-V) to not substitute spaces.
Once you know this, it is no big deal, of course.
/ivo welch ivo at next.agsm.ucla.edu
-----------------------------
From: "Richard L. Goerwitz" <goer at quads.uchicago.edu>
Subject: style, diction: anyone use them
Date: 19 Aug 90 04:41:50 GMT
Sender: News Administrator <news at midway.uchicago.edu>
To: info-unix at sem.brl.mil
Does anyone actually use style and diction. Diction has a nice
little display, and allows easy fix-ups. The dict.d file, though,
could be extended in a number of ways (does anyone have a good
dict.d file?). Style, though, seems only to report opaque word-
lengths, and various statistics on parts of speech and sentence-
type. In terms of basic, Strunk & White-type help with writing,
it seems to be of minimal use. I wonder: Has anyone actually
gotten some good mileage out of style? If so, could he or she
perhaps offer some guidance?
-Richard
-----------------------------
End of INFO-UNIX Digest
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