Drop multiple databases with names matching a pattern

Question

I want to drop all the databases starting with a word.

abc
xyz
cms_db1
cms_db2
cms_xyz
pqr

In the example given above, I will like to drop all

Answer 1

Improved @neurino solution to avoid storing of MySQL credentials in the script and passing them through a command line (it might be visible in the list of processes then)

#!/bin/bash

DB_STARTS_WITH="cms"
MYSQL="mysql"

read -p "Enter MySQL user name: " MYSQL_USER
read -s -p "Enter password: " MYSQL_PASSWORD

CREDENTIALS_FILE="$(mktemp)"
chmod 600 $CREDENTIALS_FILE
cat > $CREDENTIALS_FILE <<- EOM
[client]
user=$MYSQL_USER
password=$MYSQL_PASSWORD
EOM

trap "{ rm -f $CREDENTIALS_FILE; }" EXIT

DATABASES="$(echo "show databases;" | $MYSQL --defaults-file=$CREDENTIALS_FILE)"

for DATABASE in $DATABASES; do
    if [[ $DATABASE =~ ^${DB_STARTS_WITH} ]]; then
        echo Removing $DATABASE...
        echo "drop database $DATABASE" | $MYSQL --defaults-file=$CREDENTIALS_FILE
    fi
done