CODEWITHSUNDEEP
bashshell
Michael
Michael

Reputation: 22957

Check $ORACLE_HOME var in shell script

i am running script as root and trying to see if user oracle has ORACLE_HOME defined. here is my script:

su - $user << EOF  2>&1
    if [ -n "${ORACLE_HOME:+x}" ]
    then
        echo "KO" > /tmp/oracle.tmp
    else
        echo "$ORACLE_HOME" > /tmp/oracle.tmp
    fi
EOF

this doesnt work. it gives me if: Expression Syntax. and the file is not created. i think the problem is with the su encapsulation since when i am running the if statement alone it is working. any idea ?

And please don't ask me why i am running as root. i know its bad practice but there is nothing i can do about it.

Upvotes: 0

Views: 1836

Answers (2)

William Pursell
William Pursell

Reputation: 212464

The problem is that the quotes are getting stripped by the shell parsing the heredoc, so the code being executed is: 

if [ -n ]

To eliminate that problem, you want to avoid string interpolation in the heredoc, which you can do by quoting the delimeter:

su - $user << 'EOF'  2>&1

Of course, that will prevent ORACLE_HOME from being interpolated, so this will only work if ORACLE_HOME is in the environment (that is, it is not a shell variable, but has been exported and is an environment variable.)

Unless the sample code given in the question is a simplification, you could just do:

echo ${ORACLE_HOME:-KO} > /tmp/oracle.tmp

Upvotes: 0

choroba
choroba

Reputation: 242028

The code is probably not run in bash, but in sh that does not support the alternate value syntax.

Upvotes: 1

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