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Different behaviour when running script as source file

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# 1  
Old 06-23-2009
Different behaviour when running script as source file
Hi all,

OS: Solaris 10

I've written a script to scan the oratab file and give me a list of Oracle SIDs to choose from, and obviously in order to set the ORACLE_SID environment variable from within a script for the current shell, the script must be run as a source file.

When I run it as a normal file, i.e. not a source file, it works fine:
Code:
$ ./orasid
Choose Oracle SID:
1 SIUAT
2 RMAN
SID: 1 <-- Entered 1 here 
no of array elements: 2
ORACLE_SID set to: SIUAT

..although the env var is not actually set, as expected

but when I run it as a source file I get this:
Code:
$ . ./orasid
Choose Oracle SID:
1 SIUAT
2 RMAN
SID: 1
no of array elements: 0
Enter 1 to 0, SID not set

The problem seems to be the ${#ORACLE_SID[@]} construct to establish the total number of array elements. But why does this work as a regular shell script and not as a source file? Is there an alternative which works with both?

Thanks in advance, and here's the script:

Code:
#
# orasid - scan oratab for Oracle DBs and set SID
#
# usage: . orasid
#
#####################################
#
# Determine how to suppress newline with echo command.
#
N=
C=
if echo "\c" | grep c >/dev/null 2>&1; then
    N='-n'
else
    C='\c'
fi

ORATAB=/var/opt/oracle/oratab
#
# Loop through ORATAB
#
i=0
echo Choose Oracle SID:

cat $ORATAB | while read LINE
do

  case $LINE in
    
\#*)                ;;        #comment-line in oratab

*)
      (( i=i+1 ))
      poss_sid=`echo $LINE | awk -F: '{print $1}' -`
      if [ ! "$poss_sid" = '*' ] ; then  # ignores NULL SID
          ORACLE_SID[i]=$poss_sid
          echo $i ${ORACLE_SID[i]}
      fi
    ;;
  esac

done

echo $N "SID: $C"
read usrsid
echo no of array elements: ${#ORACLE_SID[@]}

if [ ${usrsid} -gt ${#ORACLE_SID[@]} ]; then
  echo Enter 1 to ${#ORACLE_SID[@]}, SID not set
else
  ORACLE_SID=${ORACLE_SID[usrsid]}
  export ORACLE_SID
  echo ORACLE_SID set to: ${ORACLE_SID[usrsid]}
fi

Last edited by longjon; 06-24-2009 at 07:23 AM.. Reason: add code tags
# 2  
Old 06-24-2009
To keep the forums high quality for all users, please take the time to format your posts correctly.

For instance, use Code Tags when you post any code or data samples so others can easily read your code. You can easily do this by highlighting your code and then clicking on the # in the editing menu. (You can also type code tags [code] and [/code] by hand.)

Thank You.

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