issue with simple script

[David Bear]

I thought I had a tape issue.. Now its clear I have a script issue.

Below is a script I use to perform level 0 dumps on all mounted file
systems.  The problem seems to be that when the script runs, it does
not run as root -- even though I am root when I run it. The goal is to
cron it, but as I was testing it I ran into some problems.

First, I can't set the MT variable as its listed below. I get an
permission denial on /dev/nrsa0. This makes no sense, since as root I
can issue the command fine. Moreover, the dump command itself fails
even thought it seems to be rendered syntactically correct.  I echo'ed
all the generated commands just to make certain they are correct.
Here's the output of the script:

=====================================================
ppsrvx# ./l0dump.sh
./l0dump.sh: /dev/nrsa0: permission denied
comp off
/sbin/dump -0u -a -b 64 -f /dev/nrsa0 /dev/ad0s1a
/sbin/dump -0u -a -b 64 -f /dev/nrsa0 /dev/da1s1d
/sbin/dump -0u -a -b 64 -f /dev/nrsa0 /dev/da0s1e
/sbin/dump -0u -a -b 64 -f /dev/nrsa0 /dev/da1s1e
/sbin/dump -0u -a -b 64 -f /dev/nrsa0 /dev/ad0s1d
/sbin/dump -0u -a -b 64 -f /dev/nrsa0 /dev/da0s1d
/sbin/dump -0u -a -b 64 -f /dev/nrsa0 /dev/ad0s1e
/dev/sa0 offline

======================================================

notice the permission denied..

not also 'comp off' which SHOULD be rendered as 
   /usr/bin/mt -f /dev/nrsa0 comp off

but isn't.

I'm really stumped here. 

Is there some reason why running these commands in a script would
fail, yet running them by hand works?  

========================================================
#!/bin/sh
AWK=/usr/bin/awk
DF=/bin/df
DMP=/sbin/dump
DEST=/dev/nrsa0
MT="/usr/bin/mt -f " ${DEST}
MOPTS='weof 1'
DOPTS='-0u -a -b 64 -f '
# -b 64 is max, will never use large value
FSS=`${DF} | ${AWK} '/dev/ {print $1}'` 
echo ${MT} 'comp off'
# echo ${MT} 'blocksize 512'
for FS in ${FSS} ;
   do
      echo ${DMP} ${DOPTS} ${DEST} ${FS}
      # ${MT} ${MOPTS}
   done
echo ${MT} '/dev/sa0 offline'
echo "Please swap tapes on srvx" | mail iddwb

========================================================
-- 
David Bear
phone: 	480-965-8257
fax: 	480-965-9189
College of Public Programs/ASU
Wilson Hall 232
Tempe, AZ 85287-0803
 "Beware the IP portfolio, everyone will be suspect of trespassing"