mysqld_safe --skip-grant-tables &
[6] 16800
debian:/home/vpn# mysql -u root
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
[6]+ Stopped mysqld_safe --skip-grant-tables
debian:/home/vpn# perror 6
OS error code 6: No such device or address
debian:/home/vpn# perror 2
OS error code 2: No such file or directory