$ sudo parted /dev/sda unit s print
Model: ATA Samsung SSD 850 (scsi)
Disk /dev/sda: 976773168s
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start       End         Size        File system  Name                 Flags
 1      34s         16417s      16384s                   BIOS boot partition  bios_grub
 2      16418s      278561s     262144s     fat16        EFI System           boot, esp
 3      278562s     1851425s    1572864s                 Unknown
 4      1851426s    270286881s  268435456s               Unknown
 5      270286882s  976773134s  706486253s               Unknown

$ DEV=sda; S=/sys/block/${DEV}/${DEV}; echo "DEV  P START SIZE"; for P in ${S}?; do echo "${P##*/} $(cat $P/partition) $(cat $P/start) $(cat $P/size)"; done

DEV  P START SIZE
sda1 1 34 16384
sda2 2 16418 262144
sda3 3 278562 1572864
sda4 4 1851426 268435456
sda5 5 270286882 706486253