Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!olivea!uunet!zaphod.mps.ohio-state.edu!sample.eng.ohio-state.edu!purdue!haven.umd.edu!uvaarpa!murdoch!turing!eas
From: eas@turing.acs.virginia.edu (Edward A. Schwab)
Newsgroups: comp.unix.questions
Subject: The "if ( -e filename )" blues...
Message-ID: <1991Jun17.195519.12713@murdoch.acc.Virginia.EDU>
Date: 17 Jun 91 19:55:19 GMT
Sender: usenet@murdoch.acc.Virginia.EDU
Organization: University of Virginia
Lines: 41

Help!  I'm trying to run a simple csh shell file that sets $OUT.out to an
output filename and $PROG to a program name, will search for $OUT.out, and
delete it...  I'm trying to do an "if ( -e $OUT.out ) set x=$<", which will
wait for an ENTER before continuing with the program...  The only thing is
that the "if ( -e )" statement (that searches for the existance of the file)
runs if there is an actual $OUT.out file or not...  **sigh**  How can I make
this wait for an enter keypress ONLY if $OUT.out exists???  All of the other
if -e's work (the echos and the rm...)  BTW, the actual executable is called
.$PROG; this is called up by $PROG...  :)

I hope this message makes SOME sense when you look at the actual shell script
below:
-----------------------------------------------------------------------------  
#!/bin/csh
setenv OUT for005
setenv PROG asymtc1
if ( -e $OUT.out ) clear
if ( -e $OUT.out ) echo '******************************************************'
if ( -e $OUT.out ) echo 'You have a leftover '$OUT'.out file.  Since '$PROG''
if ( -e $OUT.out ) echo 'will end up choking on this leftover file,  I am going'
if ( -e $OUT.out ) echo 'to  delete  it  for  you.  If  you  do not  want me to'
if ( -e $OUT.out ) echo 'delete it, hit ^C, ENTER, and rename it to a different'
if ( -e $OUT.out ) echo '                      filename.'
if ( -e $OUT.out ) echo '******************************************************'
if ( -e $OUT.out ) echo ' '
if ( -e $OUT.out ) echo ' If you want it deleted, press ENTER now to continue.'
if ( -e $OUT.out ) set x=$<
if ( -e $OUT.out ) rm $OUT.out
.$PROG
echo 'Now filtering...'
mv $OUT.out $OUT.asa
asa $OUT.asa >$OUT.out
rm $OUT.asa
echo ' '
echo 'Done!  File written to '$OUT.out'.'
echo ' '
-------------------------------------------------------------------------------
 
			Thanks, 
				- Ed  (eas@turing.acs.virginia.edu)
				      (eschwab@polaris.cv.nrao.edu)