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Script programs are useful for text processing involving many files.

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Script programs are useful for text processing involving many files. Write a bash shell script called minileague to input the scores of soccer games and draw up the league table among a few selected teams. The script will first read in the team information from a file whose name is specified as the first parameter, e.g. big6.dat. Each line of the file contains the short name of a team, followed by the name of the team. Your program then reads in a sequence of files containing the scores of games on different days or weeks, as indicated by the prefix of those files specified as the second parameter, e.g. score2122. This concept of a mini-league is useful for some common tie-breaking rules.

In a soccer game, there could be one winning team and one losing team, or both teams end up with a draw. The winning team will score 3 points, the losing team will score 0 point. If the game ends up with a draw, both teams will score 1 point. The ranking criterion is according to the number of points earned by a team. The champion is the one scoring the highest number of points. In case of a tie among two or more teams, the number of points earned by the teams in a Mini-League (i.e. just consider the games among those teams) will be used to rank them. Note that your program minileague could be used to perform this ranking criterion on the subset of teams involved in the tie-breaking situation. If there is still a tie among the teams, tie breaking will be based on the goal difference and the team with a larger goal difference will rank higher. In case of a tie in goal difference, tie breaking will be based on the number of goals scored and the team with a higher number of scored goals will rank higher. If there is still a tie after using the goal difference and goal scored, both teams will be considered to rank equally.

Note that for a double round-robin league common in most countries, each team needs to meet each other team twice, once at home and once away. If the number of teams, n, is even, each round will involve all n teams in n/2 games, and we need n-1 rounds for the first round-robin, and then another n-1 rounds for the second round-robin. If n is odd, there will be one team enjoying a bye round, and only (n- 1)/2 teams are involved. A total of n rounds are needed for the first round-robin, and the same for the second round-robin.

 

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