Errorlevel - how to find it?

If a program exits on a errorlevel say of 1
How do you know? What program can you use to find the current errorlevel?
chiefarcherAsked:
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warren_daleCommented:
Under the Bourne shell (at least), $? expands to the exit status of the last program. (Actually the most recent pipeline.) So we can say:
    cmp -s $ONE $TWO
    if [ $? -eq 0 ]
    then
        echo "$ONE and $TWO are identical"
    else
        echo "$ONE and $TWO are different"
    fi
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