Blue chip

Reliance Industries Chairman Mukesh Ambani overtook China’s Hui Ka Yan to become Asia’s richest person with a total wealth of $42.1 billion. According to Forbes’ real time billionaire’s list, Ambani's personal wealth rose by $466 million in 2017.

• Cactus spines are also known as modified bud scales, which are also called modified leaves.

• Cactus spines occur in clusters in the axil of leaves.

When a program forks and the child finishes before the parent, the kernel still keeps some of its information about the child in case the parent might need it – for example, the parent may need to check the child’s exit status. To be able to get this information, the parent calls `wait()’; In the interval between the child terminating and the parent calling `wait()’, the child is said to be a `zombie’ (If you do `ps’, the child will have a `Z’ in its status field to indicate this.)