shell 截取某个字符串之后的内容

# Automatically generated for Debian scripts. DO NOT TOUCH!
[client]
host     = localhost
user     = debian-sys-maint
password = ID2TNes0UQkO52UG
socket   = /var/run/mysqld/mysqld.sock
[mysql_upgrade]
host     = localhost
user     = debian-sys-maint
password = ID2TNes0UQkO52UG
socket   = /var/run/mysqld/mysqld.sock

a=$(cat /etc/mysql/debian.cnf |grep -o "password = .*"| awk -F"= " '{print $2}'|head -n 1)
echo ${a}

grep -o "password = .*"

 awk -F"= " '{print $2}'

head -n 1