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Date: Sat, 28 Aug 2004 11:41:22 -0400 (EDT)
From: Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com
To: Hannu E K Nevalainen <_garbage_collector_ AT telia DOT com>
cc: cygwin AT cygwin DOT com
Subject: RE: SYSTEM-owned shell shortcut
In-Reply-To: <NGBBLLIAMFLGJEOAJCCEOEHNDNAA._garbage_collector_@telia.com>
Message-ID: <Pine.GSO.4.61.0408281018350.14676@slinky.cs.nyu.edu>
References: <NGBBLLIAMFLGJEOAJCCEOEHNDNAA DOT _garbage_collector_ AT telia DOT com>
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On Sat, 28 Aug 2004, Hannu E K Nevalainen wrote:

> Igor wrote:
> > On Fri, 27 Aug 2004, Igor Pechtchanski wrote:
> >
> >> [snip]
> >> Or you could try to get a SYSTEM-owned shell, and remove it from
> >> there. FWIW, I have a handy shortcut for that (see below).
> >
> > Sorry, I forgot to include the promised shortcut.  Here it is:
> >
> > C:\cygwin\bin\bash.exe -c "at $(date +%H):$(($(date +%M) + 1)) /interactive 'c:\cygwin\bin\bash.exe' --login -i; secs=$((60 - $(date +%S))); while [ $secs -ne 0 ]; do echo -ne 'Please wait '$secs' seconds for the shell \r'; sleep 1; secs=$(($secs - 1)); done"
> >
> > Just paste the above line in the "Target:" field of the shortcut.
> > What this will do is show a window with the countdown until the
> > system-owned login shell pops up.  If you want to make it really
> > nice, set the width of the shortcut screen buffer (in the Layout tab)
> > to 38 and the height to 1.
> >
> > The above assumes you installed Cygwin in c:/cygwin.  If you
> > installed it somewhere else, the shortcut needs to be modified
> > accordingly.
> > HTH,
> > 	Igor
>
> Hmm... I wasn't able to get your shortcut working. First it didn't fit in
> the shortcut wizards textbox.

Yeah, it does push the command length limits, doesn't it? ;-)

> Then after having put it in "isysbash.bat" it failed with
>
> $ isysbash.bat
> bash: -c: line 1: unexpected EOF while looking for matching `)'
> bash: -c: line 2: syntax error: unexpected end of file
> $ cat isysbash.bat
> @echo off
> C:
> cd \Program\Cygwin\bin\
> bash.exe -x -c "at $(date +%H):$(( $(date +%M) + 1 )) /interactive 'bash.exe' --login -i; secs=$(( 60 - $(date +%S) )); while [ $secs -ne 0 ]; do echo -ne 'Please wait' $secs 'seconds for the shell \r'; sleep 1; secs=$(( $secs - 1 )); done"
>
> Counting the parentheses; They match! Heh? What is the problem?

This is the standard batch file % problem -- it interprets all %* as
variables (and the ":" as a modifier).  You need to quote each %, i.e. use

bash.exe -x -c "at $(date +%%H):$(( $(date +%%M) + 1 )) /interactive 'bash.exe' --login -i; secs=$(( 60 - $(date +%%S) )); while [ $secs -ne 0 ]; do echo -ne 'Please wait' $secs 'seconds for the shell \r'; sleep 1; secs=$(( $secs - 1 )); done"

BTW, the spaces after "$((" and before "))" are redundant.

> Your scripting also have a problem at hour boundaries. (Launch it
> "imaginary" at 11:59 or 23:59).

Yes, true.  I've looked long and in vain for a way of converting the date
from pure second counts (you can convert *to* the second count using the
"%s" GNU extension).  If anyone finds such a way, please let me know.  Of
course, one can always use perl, but that seems a bit heavyweight for such
a purpose.

> There might also be a problem with "at" not accepting single digit
> hours, I'm not as sure about that though.

Nope, the "%H" format always outputs the hours as double digits in 24-hour
format.

> I've attached my "sysbash", which WFM.
> Who knows there might be problems with it too ;-P

Well, not so much as a problem, just seems too complex.  Why call *bash*
through *cmd /c*???  Why bother with control codes?  Wouldn't something
like the below script be much simpler?

--------------------- BEGIN script ---------------------
#!/bin/bash
export CYGWIN="$CYGWIN check_case:adjust"
AT="`which at 2>/dev/null`"
[ -z "$AT" ] && echo "\"at.exe\" not found" >&2 && exit 1
CMD="$(cygpath -aw /bin/bash.exe) --login -i"
HHMM="$(echo "$(date "+%H +%M")" | awk '{printf("%02d:%02d",($2>58)?($1+1)%24:$1,($2>58)?0:($2+1))}')"
"$AT" "$HHMM" /interactive $CMD
# Countdown
secs=$((60 - $(date +%S))); while [ $secs -ne 0 ]; do echo -ne 'Please wait' $secs 'seconds for the shell \r'; sleep 1; secs=$(( $secs - 1 )); done
---------------------- END script ----------------------

Oh, and at.exe doesn't exist under Win9x normally, but there's a MSDN
sample that can be compiled and should work on Win9x:
<http://msdn.microsoft.com/library/en-us/vcsample98/html/vcsmptasksched.asp>.

HTH,
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
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ZZZzz /,`.-'`'    -.  ;-;;,_		igor AT watson DOT ibm DOT com
     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski, Ph.D.
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

"Happiness lies in being privileged to work hard for long hours in doing
whatever you think is worth doing."  -- Dr. Jubal Harshaw

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