Program 1: Here are the codes: 1.// Java code to show the implementation of2.// keySet() method3.4.import5.java.util.*;6.public7.class8.GfG {9.10.11.// Main method12.13.public14.static15.void16.main(String[] args)17.18.{19.20.21.// Create a properties and add some values22.23....
eval: Main routine that parses and interprets the command line. [70 lines] builtin cmd: Recognizes and interprets the built-in commands: quit, fg, bg, and jobs. [25 lines] do bgfg: Implements the bg and fg built-in commands. [50 lines] 1 waitfg: Waits for a foreground job to ...