What is the difference between exec and Xargs in Unix?

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1. #replace
2. #blank
3. #deliver
4. #command
5. #commands
6. #followed
7. #another
8. #standard
9. #executes
10. #process
11. #input
12. #initial
13. #tokens
14. #xargs
15. #shell
16. #using
17. #stdin
18. #argument
19. #options
20. #reads