Shell Programming and Scripting

#!/bin/bash
grep '^skip-slave-start' my.cnf >& /dev/null
if [ $? -ne 0 ] ; then
    echo "skip-slave-start is not turned on, so going to turn it on..."
    grep '^ *# *skip-slave-start' my.cnf >& /dev/null
    if [ $? -eq 0 ] ; then
    # skip-slave-start is commented
        sed -i 's/^ *# *skip-slave-start/skip-slave-start/' my.cnf
            # so uncommnt it
    else
    # skip-slave-start is not present
        sed -i 's/\[mysqld\]/[mysqld]\nskip-level-start/' my.cnf
            # so add it in [mysqld] section
    fi
else
    echo "skip-slave-start was turned on"
fi