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archlinux mariadb installation

# pacman -S mariadb
# mysql_install_db --user=mysql --basedir=/usr --datadir=/var/lib/mysql
# systemctl enable mysqld.service
# systemctl start mysqld.service
# mysql_secure_installation

遗忘root密码的话，类似windows下：
# systemctl stop mysqld.service
# mysqld_safe --skip-grant-tables &
# mysql -u root mysql
mysql> UPDATE mysql.user SET Password=PASSWORD('MyNewPass') WHERE User='root';
mysql> FLUSH PRIVILEGES;
mysql> exit
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go url encoding

func  QueryUnescape func QueryUnescape (s string ) ( string , error ) QueryUnescape does the inverse transformation of QueryEscape, converting %AB into the byte 0xAB and '+' into ' ' (space). It returns an error if any % is not followed by two hexadecimal digits. func  QueryUnescape func QueryUnescape (s string ) ( string , error ) QueryUnescape does the inverse transformation of QueryEscape, converting %AB into the byte 0xAB and '+' into ' ' (space). It returns an error if any % is not followed by two hexadecimal digits.
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go golang get disk usage free space remain info

package main import ( "fmt" "syscall" ) func main() { fmt.Println(DiskUsage("./")) } func DiskUsage(path string) uint64 { fs := syscall.Statfs_t{} err := syscall.Statfs(path, &fs) if err != nil { return 0 } return fs.Bfree * uint64(fs.Bsize) } //All space   = fs.Blocks * uint64(fs.Bsize) //Free space = fs.Bfree * uint64(fs.Bsize) //Used space= fs.All - disk.Free
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