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Problem unary operator expected

 
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# 1  
Old 12-08-2009
Problem unary operator expected
I get the following error
./get_NE05: line 42: [: 4: unary operator expected
Line 42 corresponds to the second IF statement
Code:
while [ $I -le $2 ]
do
    echo ${STRING_NAME[$J]}
    J=1
    if [ $I -lt 10 ]; then
         EXT=0$I
    else
         EXT=$I
    fi
    while [ $J -le 4 ]
    do
        echo $I-$J
        #calculating last occurrence
        OCCURRENCE=`grep -io "${STRING_NAME[$J]}" ${1}-0${EXT}.out_bis| wc -l`
        if [ $J -eq 1 ]; then
            OLD_OCCURRENCE[$J]=${OCCURRENCE}
        fi
        if [ ${OCCURRENCE} -ne ${OLD_OCCURRENCE[$J]} ]; then
            echo "error" $OCCURRENCE[$J] $OLD_OCCURRENCE[$J]
        fi
        J=`expr $J + 1`
    done
    I=`expr $I + 1`
done

Any idea what I'm doing wrong?
Thanks,
Sarah
# 2  
Old 12-09-2009
echo your variables to see what values are currently assigned before that line. You can also use set -x/ set +x to check what is going on. You can also try out double brackets etc.
# 3  
Old 12-20-2009
i know why
i know why, its because I and J are not set you have to do the following:

I=0
J=0

I=`command`
etc...
# 4  
Old 12-20-2009
Quote:
Originally Posted by f_o_555
I get the following error
./get_NE05: line 42: [: 4: unary operator expected
Line 42 corresponds to the second IF statement
Code:
while [ $I -le $2 ]
do
    echo ${STRING_NAME[$J]}
    J=1
    if [ $I -lt 10 ]; then
         EXT=0$I
    else
         EXT=$I
    fi
    while [ $J -le 4 ]
    do
        echo $I-$J
        #calculating last occurrence
        OCCURRENCE=`grep -io "${STRING_NAME[$J]}" ${1}-0${EXT}.out_bis| wc -l`
        if [ $J -eq 1 ]; then
            OLD_OCCURRENCE[$J]=${OCCURRENCE}
        fi
        if [ ${OCCURRENCE} -ne ${OLD_OCCURRENCE[$J]} ]; then
            echo "error" $OCCURRENCE[$J] $OLD_OCCURRENCE[$J]
        fi
        J=`expr $J + 1`
    done
    I=`expr $I + 1`
done

Any idea what I'm doing wrong?
Thanks,
Sarah
I don't think the second if statement is the problem. You would have a problem with the second while before that. J is already declared.

You are setting OLD_OCCURRENCE only when J is 1, but testing it for every value of J. That could be a problem.

On top of that you're treating OCCURRENCE both as a variable and as an array. Which is it?

And what is the starting value of I?
 
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